diff --git a/compiler/rustc_attr_parsing/src/attributes/crate_level.rs b/compiler/rustc_attr_parsing/src/attributes/crate_level.rs
index 557dfe09853b..bdfe7bfb8f1f 100644
--- a/compiler/rustc_attr_parsing/src/attributes/crate_level.rs
+++ b/compiler/rustc_attr_parsing/src/attributes/crate_level.rs
@@ -283,3 +283,12 @@ impl<S: Stage> NoArgsAttributeParser<S> for RustcPreserveUbChecksParser {
     const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowList(&[Allow(Target::Crate)]);
     const CREATE: fn(Span) -> AttributeKind = |_| AttributeKind::RustcPreserveUbChecks;
 }
+
+pub(crate) struct RustcNoImplicitBoundsParser;
+
+impl<S: Stage> NoArgsAttributeParser<S> for RustcNoImplicitBoundsParser {
+    const PATH: &[Symbol] = &[sym::rustc_no_implicit_bounds];
+    const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Warn;
+    const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowList(&[Allow(Target::Crate)]);
+    const CREATE: fn(Span) -> AttributeKind = |_| AttributeKind::RustcNoImplicitBounds;
+}
diff --git a/compiler/rustc_attr_parsing/src/context.rs b/compiler/rustc_attr_parsing/src/context.rs
index ddb5ae33bc98..80dda5efd1c5 100644
--- a/compiler/rustc_attr_parsing/src/context.rs
+++ b/compiler/rustc_attr_parsing/src/context.rs
@@ -282,6 +282,7 @@ mod late {
         Single<WithoutArgs<RustcMainParser>>,
         Single<WithoutArgs<RustcNeverReturnsNullPointerParser>>,
         Single<WithoutArgs<RustcNoImplicitAutorefsParser>>,
+        Single<WithoutArgs<RustcNoImplicitBoundsParser>>,
         Single<WithoutArgs<RustcNonConstTraitMethodParser>>,
         Single<WithoutArgs<RustcNounwindParser>>,
         Single<WithoutArgs<RustcOffloadKernelParser>>,
diff --git a/compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs b/compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs
index 4fb739403ced..853ecd3c91f7 100644
--- a/compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs
+++ b/compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs
@@ -1695,7 +1695,7 @@ fn suggest_ampmut<'tcx>(
                 && let Either::Left(rhs_stmt_new) = body.stmt_at(*assign)
                 && let StatementKind::Assign(box (_, rvalue_new)) = &rhs_stmt_new.kind
                 && let rhs_span_new = rhs_stmt_new.source_info.span
-                && let Ok(rhs_str_new) = tcx.sess.source_map().span_to_snippet(rhs_span)
+                && let Ok(rhs_str_new) = tcx.sess.source_map().span_to_snippet(rhs_span_new)
             {
                 (rvalue, rhs_span, rhs_str) = (rvalue_new, rhs_span_new, rhs_str_new);
             }
diff --git a/compiler/rustc_borrowck/src/lib.rs b/compiler/rustc_borrowck/src/lib.rs
index 361e98454e83..38b73a07a689 100644
--- a/compiler/rustc_borrowck/src/lib.rs
+++ b/compiler/rustc_borrowck/src/lib.rs
@@ -121,6 +121,11 @@ fn mir_borrowck(
     let (input_body, _) = tcx.mir_promoted(def);
     debug!("run query mir_borrowck: {}", tcx.def_path_str(def));
 
+    // We should eagerly check stalled coroutine obligations from HIR typeck.
+    // Not doing so leads to silent normalization failures later, which will
+    // fail to register opaque types in the next solver.
+    tcx.check_coroutine_obligations(def)?;
+
     let input_body: &Body<'_> = &input_body.borrow();
     if let Some(guar) = input_body.tainted_by_errors {
         debug!("Skipping borrowck because of tainted body");
diff --git a/compiler/rustc_hir/src/attrs/data_structures.rs b/compiler/rustc_hir/src/attrs/data_structures.rs
index d9c4179cca83..bfbf1272e5fc 100644
--- a/compiler/rustc_hir/src/attrs/data_structures.rs
+++ b/compiler/rustc_hir/src/attrs/data_structures.rs
@@ -1177,6 +1177,9 @@ pub enum AttributeKind {
     /// Represents `#[rustc_no_implicit_autorefs]`
     RustcNoImplicitAutorefs,
 
+    /// Represents `#[rustc_no_implicit_bounds]`
+    RustcNoImplicitBounds,
+
     /// Represents `#[rustc_non_const_trait_method]`.
     RustcNonConstTraitMethod,
 
diff --git a/compiler/rustc_hir/src/attrs/encode_cross_crate.rs b/compiler/rustc_hir/src/attrs/encode_cross_crate.rs
index d55cb1d6f66a..ae9f9899ffd9 100644
--- a/compiler/rustc_hir/src/attrs/encode_cross_crate.rs
+++ b/compiler/rustc_hir/src/attrs/encode_cross_crate.rs
@@ -137,6 +137,7 @@ pub fn encode_cross_crate(&self) -> EncodeCrossCrate {
             RustcMustImplementOneOf { .. } => No,
             RustcNeverReturnsNullPointer => Yes,
             RustcNoImplicitAutorefs => Yes,
+            RustcNoImplicitBounds => No,
             RustcNonConstTraitMethod => No, // should be reported via other queries like `constness`
             RustcNounwind => No,
             RustcObjcClass { .. } => No,
diff --git a/compiler/rustc_hir_analysis/src/hir_ty_lowering/bounds.rs b/compiler/rustc_hir_analysis/src/hir_ty_lowering/bounds.rs
index a1c3af5f999d..85e96e200c2e 100644
--- a/compiler/rustc_hir_analysis/src/hir_ty_lowering/bounds.rs
+++ b/compiler/rustc_hir_analysis/src/hir_ty_lowering/bounds.rs
@@ -4,15 +4,16 @@
 use rustc_errors::codes::*;
 use rustc_errors::struct_span_code_err;
 use rustc_hir as hir;
-use rustc_hir::PolyTraitRef;
+use rustc_hir::attrs::AttributeKind;
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::def_id::{CRATE_DEF_ID, DefId};
+use rustc_hir::{PolyTraitRef, find_attr};
 use rustc_middle::bug;
 use rustc_middle::ty::{
     self as ty, IsSuggestable, Ty, TyCtxt, TypeSuperVisitable, TypeVisitable, TypeVisitableExt,
     TypeVisitor, Upcast,
 };
-use rustc_span::{ErrorGuaranteed, Ident, Span, kw, sym};
+use rustc_span::{ErrorGuaranteed, Ident, Span, kw};
 use rustc_trait_selection::traits;
 use smallvec::SmallVec;
 use tracing::{debug, instrument};
@@ -170,7 +171,7 @@ pub(crate) fn add_implicit_sizedness_bounds(
         let tcx = self.tcx();
 
         // Skip adding any default bounds if `#![rustc_no_implicit_bounds]`
-        if tcx.has_attr(CRATE_DEF_ID, sym::rustc_no_implicit_bounds) {
+        if find_attr!(tcx.get_all_attrs(CRATE_DEF_ID), AttributeKind::RustcNoImplicitBounds) {
             return;
         }
 
@@ -284,7 +285,8 @@ fn should_add_default_traits<'a>(
         context: ImpliedBoundsContext<'tcx>,
     ) -> bool {
         let collected = collect_bounds(hir_bounds, context, trait_def_id);
-        !self.tcx().has_attr(CRATE_DEF_ID, sym::rustc_no_implicit_bounds) && !collected.any()
+        !find_attr!(self.tcx().get_all_attrs(CRATE_DEF_ID), AttributeKind::RustcNoImplicitBounds)
+            && !collected.any()
     }
 
     fn reject_duplicate_relaxed_bounds(&self, relaxed_bounds: SmallVec<[&PolyTraitRef<'_>; 1]>) {
diff --git a/compiler/rustc_interface/src/passes.rs b/compiler/rustc_interface/src/passes.rs
index 42ef66847858..e474f106433d 100644
--- a/compiler/rustc_interface/src/passes.rs
+++ b/compiler/rustc_interface/src/passes.rs
@@ -1116,18 +1116,14 @@ fn run_required_analyses(tcx: TyCtxt<'_>) {
             {
                 tcx.ensure_ok().mir_drops_elaborated_and_const_checked(def_id);
             }
-            if tcx.is_coroutine(def_id.to_def_id()) {
-                tcx.ensure_ok().mir_coroutine_witnesses(def_id);
-                let _ = tcx.ensure_ok().check_coroutine_obligations(
-                    tcx.typeck_root_def_id(def_id.to_def_id()).expect_local(),
+            if tcx.is_coroutine(def_id.to_def_id())
+                && (!tcx.is_async_drop_in_place_coroutine(def_id.to_def_id()))
+            {
+                // Eagerly check the unsubstituted layout for cycles.
+                tcx.ensure_ok().layout_of(
+                    ty::TypingEnv::post_analysis(tcx, def_id.to_def_id())
+                        .as_query_input(tcx.type_of(def_id).instantiate_identity()),
                 );
-                if !tcx.is_async_drop_in_place_coroutine(def_id.to_def_id()) {
-                    // Eagerly check the unsubstituted layout for cycles.
-                    tcx.ensure_ok().layout_of(
-                        ty::TypingEnv::post_analysis(tcx, def_id.to_def_id())
-                            .as_query_input(tcx.type_of(def_id).instantiate_identity()),
-                    );
-                }
             }
         });
     });
diff --git a/compiler/rustc_middle/src/ty/context/tls.rs b/compiler/rustc_middle/src/ty/context/tls.rs
index fa9995898ac2..a06f92792820 100644
--- a/compiler/rustc_middle/src/ty/context/tls.rs
+++ b/compiler/rustc_middle/src/ty/context/tls.rs
@@ -16,8 +16,7 @@ pub struct ImplicitCtxt<'a, 'tcx> {
     /// The current `TyCtxt`.
     pub tcx: TyCtxt<'tcx>,
 
-    /// The current query job, if any. This is updated by `JobOwner::start` in
-    /// `ty::query::plumbing` when executing a query.
+    /// The current query job, if any.
     pub query: Option<QueryJobId>,
 
     /// Used to prevent queries from calling too deeply.
diff --git a/compiler/rustc_passes/src/check_attr.rs b/compiler/rustc_passes/src/check_attr.rs
index 3f89ff577d59..f3c98f5d910e 100644
--- a/compiler/rustc_passes/src/check_attr.rs
+++ b/compiler/rustc_passes/src/check_attr.rs
@@ -330,6 +330,7 @@ fn check_attributes(
                     | AttributeKind::RustcMir(_)
                     | AttributeKind::RustcNeverReturnsNullPointer
                     | AttributeKind::RustcNoImplicitAutorefs
+                    | AttributeKind::RustcNoImplicitBounds
                     | AttributeKind::RustcNonConstTraitMethod
                     | AttributeKind::RustcNounwind
                     | AttributeKind::RustcObjcClass { .. }
@@ -413,7 +414,6 @@ fn check_attributes(
                             // crate-level attrs, are checked below
                             | sym::feature
                             | sym::register_tool
-                            | sym::rustc_no_implicit_bounds
                             | sym::test_runner,
                             ..
                         ] => {}
diff --git a/compiler/rustc_query_impl/src/execution.rs b/compiler/rustc_query_impl/src/execution.rs
index ba442d8a0081..88604c91d025 100644
--- a/compiler/rustc_query_impl/src/execution.rs
+++ b/compiler/rustc_query_impl/src/execution.rs
@@ -83,14 +83,18 @@ pub(crate) fn gather_active_jobs_inner<'tcx, K: Copy>(
     Some(())
 }
 
-/// A type representing the responsibility to execute the job in the `job` field.
-/// This will poison the relevant query if dropped.
-struct JobOwner<'tcx, K>
+/// Guard object representing the responsibility to execute a query job and
+/// mark it as completed.
+///
+/// This will poison the relevant query key if it is dropped without calling
+/// [`Self::complete`].
+struct ActiveJobGuard<'tcx, K>
 where
     K: Eq + Hash + Copy,
 {
     state: &'tcx QueryState<'tcx, K>,
     key: K,
+    key_hash: u64,
 }
 
 #[cold]
@@ -137,20 +141,19 @@ fn handle_cycle_error<'tcx, C: QueryCache, const FLAGS: QueryFlags>(
     }
 }
 
-impl<'tcx, K> JobOwner<'tcx, K>
+impl<'tcx, K> ActiveJobGuard<'tcx, K>
 where
     K: Eq + Hash + Copy,
 {
     /// Completes the query by updating the query cache with the `result`,
-    /// signals the waiter and forgets the JobOwner, so it won't poison the query
-    fn complete<C>(self, cache: &C, key_hash: u64, result: C::Value, dep_node_index: DepNodeIndex)
+    /// signals the waiter, and forgets the guard so it won't poison the query.
+    fn complete<C>(self, cache: &C, result: C::Value, dep_node_index: DepNodeIndex)
     where
         C: QueryCache<Key = K>,
     {
-        let key = self.key;
-        let state = self.state;
-
-        // Forget ourself so our destructor won't poison the query
+        // Forget ourself so our destructor won't poison the query.
+        // (Extract fields by value first to make sure we don't leak anything.)
+        let Self { state, key, key_hash }: Self = self;
         mem::forget(self);
 
         // Mark as complete before we remove the job from the active state
@@ -174,7 +177,7 @@ fn complete<C>(self, cache: &C, key_hash: u64, result: C::Value, dep_node_index:
     }
 }
 
-impl<'tcx, K> Drop for JobOwner<'tcx, K>
+impl<'tcx, K> Drop for ActiveJobGuard<'tcx, K>
 where
     K: Eq + Hash + Copy,
 {
@@ -182,11 +185,10 @@ impl<'tcx, K> Drop for JobOwner<'tcx, K>
     #[cold]
     fn drop(&mut self) {
         // Poison the query so jobs waiting on it panic.
-        let state = self.state;
+        let Self { state, key, key_hash } = *self;
         let job = {
-            let key_hash = sharded::make_hash(&self.key);
             let mut shard = state.active.lock_shard_by_hash(key_hash);
-            match shard.find_entry(key_hash, equivalent_key(&self.key)) {
+            match shard.find_entry(key_hash, equivalent_key(&key)) {
                 Err(_) => panic!(),
                 Ok(occupied) => {
                     let ((key, value), vacant) = occupied.remove();
@@ -342,11 +344,13 @@ fn execute_job<'tcx, C: QueryCache, const FLAGS: QueryFlags, const INCR: bool>(
     id: QueryJobId,
     dep_node: Option<DepNode>,
 ) -> (C::Value, Option<DepNodeIndex>) {
-    // Use `JobOwner` so the query will be poisoned if executing it panics.
-    let job_owner = JobOwner { state, key };
+    // Set up a guard object that will automatically poison the query if a
+    // panic occurs while executing the query (or any intermediate plumbing).
+    let job_guard = ActiveJobGuard { state, key, key_hash };
 
     debug_assert_eq!(qcx.tcx.dep_graph.is_fully_enabled(), INCR);
 
+    // Delegate to another function to actually execute the query job.
     let (result, dep_node_index) = if INCR {
         execute_job_incr(query, qcx, qcx.tcx.dep_graph.data().unwrap(), key, dep_node, id)
     } else {
@@ -388,7 +392,9 @@ fn execute_job<'tcx, C: QueryCache, const FLAGS: QueryFlags, const INCR: bool>(
             }
         }
     }
-    job_owner.complete(cache, key_hash, result, dep_node_index);
+
+    // Tell the guard to perform completion bookkeeping, and also to not poison the query.
+    job_guard.complete(cache, result, dep_node_index);
 
     (result, Some(dep_node_index))
 }
diff --git a/compiler/rustc_target/src/spec/targets/wasm32_unknown_emscripten.rs b/compiler/rustc_target/src/spec/targets/wasm32_unknown_emscripten.rs
index fb735b54dd82..4b6f5b655760 100644
--- a/compiler/rustc_target/src/spec/targets/wasm32_unknown_emscripten.rs
+++ b/compiler/rustc_target/src/spec/targets/wasm32_unknown_emscripten.rs
@@ -19,8 +19,15 @@ pub(crate) fn target() -> Target {
         pre_link_args,
         post_link_args,
         relocation_model: RelocModel::Pic,
+        // crt_static should always be true for an executable and always false
+        // for a shared library. There is no easy way to indicate this and it
+        // doesn't seem to matter much so we set crt_static_allows_dylibs to
+        // true and leave crt_static as true when linking dynamic libraries.
+        // wasi also sets crt_static_allows_dylibs: true so this is at least
+        // aligned between wasm targets.
         crt_static_respected: true,
         crt_static_default: true,
+        crt_static_allows_dylibs: true,
         panic_strategy: PanicStrategy::Unwind,
         no_default_libraries: false,
         families: cvs!["unix", "wasm"],
diff --git a/compiler/rustc_trait_selection/src/traits/vtable.rs b/compiler/rustc_trait_selection/src/traits/vtable.rs
index 584c8e2a27c8..bd48068eb579 100644
--- a/compiler/rustc_trait_selection/src/traits/vtable.rs
+++ b/compiler/rustc_trait_selection/src/traits/vtable.rs
@@ -12,7 +12,7 @@
 use smallvec::{SmallVec, smallvec};
 use tracing::debug;
 
-use crate::traits::{impossible_predicates, is_vtable_safe_method};
+use crate::traits::is_vtable_safe_method;
 
 #[derive(Clone, Debug)]
 pub enum VtblSegment<'tcx> {
@@ -271,11 +271,7 @@ fn vtable_entries<'tcx>(
                     // do not hold for this particular set of type parameters.
                     // Note that this method could then never be called, so we
                     // do not want to try and codegen it, in that case (see #23435).
-                    let predicates = tcx.predicates_of(def_id).instantiate_own(tcx, args);
-                    if impossible_predicates(
-                        tcx,
-                        predicates.map(|(predicate, _)| predicate).collect(),
-                    ) {
+                    if tcx.instantiate_and_check_impossible_predicates((def_id, args)) {
                         debug!("vtable_entries: predicates do not hold");
                         return VtblEntry::Vacant;
                     }
diff --git a/library/core/src/cell.rs b/library/core/src/cell.rs
index 661ea4ab6a27..a9e7c49515c7 100644
--- a/library/core/src/cell.rs
+++ b/library/core/src/cell.rs
@@ -689,6 +689,30 @@ impl<T: CoerceUnsized<U>, U> CoerceUnsized<Cell<U>> for Cell<T> {}
 #[unstable(feature = "dispatch_from_dyn", issue = "none")]
 impl<T: DispatchFromDyn<U>, U> DispatchFromDyn<Cell<U>> for Cell<T> {}
 
+#[stable(feature = "more_conversion_trait_impls", since = "CURRENT_RUSTC_VERSION")]
+impl<T, const N: usize> AsRef<[Cell<T>; N]> for Cell<[T; N]> {
+    #[inline]
+    fn as_ref(&self) -> &[Cell<T>; N] {
+        self.as_array_of_cells()
+    }
+}
+
+#[stable(feature = "more_conversion_trait_impls", since = "CURRENT_RUSTC_VERSION")]
+impl<T, const N: usize> AsRef<[Cell<T>]> for Cell<[T; N]> {
+    #[inline]
+    fn as_ref(&self) -> &[Cell<T>] {
+        &*self.as_array_of_cells()
+    }
+}
+
+#[stable(feature = "more_conversion_trait_impls", since = "CURRENT_RUSTC_VERSION")]
+impl<T> AsRef<[Cell<T>]> for Cell<[T]> {
+    #[inline]
+    fn as_ref(&self) -> &[Cell<T>] {
+        self.as_slice_of_cells()
+    }
+}
+
 impl<T> Cell<[T]> {
     /// Returns a `&[Cell<T>]` from a `&Cell<[T]>`
     ///
diff --git a/library/core/src/mem/maybe_uninit.rs b/library/core/src/mem/maybe_uninit.rs
index 320eb97f83a4..594147720193 100644
--- a/library/core/src/mem/maybe_uninit.rs
+++ b/library/core/src/mem/maybe_uninit.rs
@@ -1532,6 +1532,56 @@ pub const fn as_bytes_mut(&mut self) -> &mut [MaybeUninit<u8>] {
     }
 }
 
+#[stable(feature = "more_conversion_trait_impls", since = "CURRENT_RUSTC_VERSION")]
+impl<T, const N: usize> From<[MaybeUninit<T>; N]> for MaybeUninit<[T; N]> {
+    #[inline]
+    fn from(arr: [MaybeUninit<T>; N]) -> Self {
+        arr.transpose()
+    }
+}
+
+#[stable(feature = "more_conversion_trait_impls", since = "CURRENT_RUSTC_VERSION")]
+impl<T, const N: usize> AsRef<[MaybeUninit<T>; N]> for MaybeUninit<[T; N]> {
+    #[inline]
+    fn as_ref(&self) -> &[MaybeUninit<T>; N] {
+        // SAFETY: T and MaybeUninit<T> have the same layout
+        unsafe { &*ptr::from_ref(self).cast() }
+    }
+}
+
+#[stable(feature = "more_conversion_trait_impls", since = "CURRENT_RUSTC_VERSION")]
+impl<T, const N: usize> AsRef<[MaybeUninit<T>]> for MaybeUninit<[T; N]> {
+    #[inline]
+    fn as_ref(&self) -> &[MaybeUninit<T>] {
+        &*AsRef::<[MaybeUninit<T>; N]>::as_ref(self)
+    }
+}
+
+#[stable(feature = "more_conversion_trait_impls", since = "CURRENT_RUSTC_VERSION")]
+impl<T, const N: usize> AsMut<[MaybeUninit<T>; N]> for MaybeUninit<[T; N]> {
+    #[inline]
+    fn as_mut(&mut self) -> &mut [MaybeUninit<T>; N] {
+        // SAFETY: T and MaybeUninit<T> have the same layout
+        unsafe { &mut *ptr::from_mut(self).cast() }
+    }
+}
+
+#[stable(feature = "more_conversion_trait_impls", since = "CURRENT_RUSTC_VERSION")]
+impl<T, const N: usize> AsMut<[MaybeUninit<T>]> for MaybeUninit<[T; N]> {
+    #[inline]
+    fn as_mut(&mut self) -> &mut [MaybeUninit<T>] {
+        &mut *AsMut::<[MaybeUninit<T>; N]>::as_mut(self)
+    }
+}
+
+#[stable(feature = "more_conversion_trait_impls", since = "CURRENT_RUSTC_VERSION")]
+impl<T, const N: usize> From<MaybeUninit<[T; N]>> for [MaybeUninit<T>; N] {
+    #[inline]
+    fn from(arr: MaybeUninit<[T; N]>) -> Self {
+        arr.transpose()
+    }
+}
+
 impl<T, const N: usize> [MaybeUninit<T>; N] {
     /// Transposes a `[MaybeUninit<T>; N]` into a `MaybeUninit<[T; N]>`.
     ///
diff --git a/library/core/src/slice/iter.rs b/library/core/src/slice/iter.rs
index a289b0d6df40..ac096afb38af 100644
--- a/library/core/src/slice/iter.rs
+++ b/library/core/src/slice/iter.rs
@@ -2175,7 +2175,7 @@ unsafe impl<T> Sync for ChunksExactMut<'_, T> where T: Sync {}
 ///
 /// [`array_windows`]: slice::array_windows
 /// [slices]: slice
-#[derive(Debug, Clone, Copy)]
+#[derive(Debug)]
 #[stable(feature = "array_windows", since = "1.94.0")]
 #[must_use = "iterators are lazy and do nothing unless consumed"]
 pub struct ArrayWindows<'a, T: 'a, const N: usize> {
@@ -2189,6 +2189,14 @@ pub(super) const fn new(slice: &'a [T]) -> Self {
     }
 }
 
+// FIXME(#26925) Remove in favor of `#[derive(Clone)]`
+#[stable(feature = "array_windows", since = "1.94.0")]
+impl<T, const N: usize> Clone for ArrayWindows<'_, T, N> {
+    fn clone(&self) -> Self {
+        Self { v: self.v }
+    }
+}
+
 #[stable(feature = "array_windows", since = "1.94.0")]
 impl<'a, T, const N: usize> Iterator for ArrayWindows<'a, T, N> {
     type Item = &'a [T; N];
@@ -2224,6 +2232,14 @@ fn nth(&mut self, n: usize) -> Option<Self::Item> {
     fn last(self) -> Option<Self::Item> {
         self.v.last_chunk()
     }
+
+    unsafe fn __iterator_get_unchecked(&mut self, idx: usize) -> Self::Item {
+        // SAFETY: since the caller guarantees that `idx` is in bounds,
+        // which means that `idx` cannot overflow an `isize`, and the
+        // "slice" created by `cast_array` is a subslice of `self.v`
+        // thus is guaranteed to be valid for the lifetime `'a` of `self.v`.
+        unsafe { &*self.v.as_ptr().add(idx).cast_array() }
+    }
 }
 
 #[stable(feature = "array_windows", since = "1.94.0")]
@@ -2252,6 +2268,22 @@ fn is_empty(&self) -> bool {
     }
 }
 
+#[unstable(feature = "trusted_len", issue = "37572")]
+unsafe impl<T, const N: usize> TrustedLen for ArrayWindows<'_, T, N> {}
+
+#[stable(feature = "array_windows", since = "1.94.0")]
+impl<T, const N: usize> FusedIterator for ArrayWindows<'_, T, N> {}
+
+#[doc(hidden)]
+#[unstable(feature = "trusted_random_access", issue = "none")]
+unsafe impl<T, const N: usize> TrustedRandomAccess for ArrayWindows<'_, T, N> {}
+
+#[doc(hidden)]
+#[unstable(feature = "trusted_random_access", issue = "none")]
+unsafe impl<T, const N: usize> TrustedRandomAccessNoCoerce for ArrayWindows<'_, T, N> {
+    const MAY_HAVE_SIDE_EFFECT: bool = false;
+}
+
 /// An iterator over a slice in (non-overlapping) chunks (`chunk_size` elements at a
 /// time), starting at the end of the slice.
 ///
diff --git a/library/proc_macro/src/bridge/client.rs b/library/proc_macro/src/bridge/client.rs
index 8f4a79b389f6..02a408802b6f 100644
--- a/library/proc_macro/src/bridge/client.rs
+++ b/library/proc_macro/src/bridge/client.rs
@@ -121,7 +121,7 @@ impl Methods {
         }
     }
 }
-with_api!(self, define_client_side);
+with_api!(define_client_side, TokenStream, Span, Symbol);
 
 struct Bridge<'a> {
     /// Reusable buffer (only `clear`-ed, never shrunk), primarily
@@ -129,7 +129,7 @@ struct Bridge<'a> {
     cached_buffer: Buffer,
 
     /// Server-side function that the client uses to make requests.
-    dispatch: closure::Closure<'a, Buffer, Buffer>,
+    dispatch: closure::Closure<'a>,
 
     /// Provided globals for this macro expansion.
     globals: ExpnGlobals<Span>,
diff --git a/library/proc_macro/src/bridge/closure.rs b/library/proc_macro/src/bridge/closure.rs
index e5133907854b..88c4dd6630b1 100644
--- a/library/proc_macro/src/bridge/closure.rs
+++ b/library/proc_macro/src/bridge/closure.rs
@@ -1,10 +1,12 @@
-//! Closure type (equivalent to `&mut dyn FnMut(A) -> R`) that's `repr(C)`.
+//! Closure type (equivalent to `&mut dyn FnMut(Buffer) -> Buffer`) that's `repr(C)`.
 
 use std::marker::PhantomData;
 
+use super::Buffer;
+
 #[repr(C)]
-pub(super) struct Closure<'a, A, R> {
-    call: unsafe extern "C" fn(*mut Env, A) -> R,
+pub(super) struct Closure<'a> {
+    call: extern "C" fn(*mut Env, Buffer) -> Buffer,
     env: *mut Env,
     // Prevent Send and Sync impls.
     //
@@ -14,17 +16,17 @@ pub(super) struct Closure<'a, A, R> {
 
 struct Env;
 
-impl<'a, A, R, F: FnMut(A) -> R> From<&'a mut F> for Closure<'a, A, R> {
+impl<'a, F: FnMut(Buffer) -> Buffer> From<&'a mut F> for Closure<'a> {
     fn from(f: &'a mut F) -> Self {
-        unsafe extern "C" fn call<A, R, F: FnMut(A) -> R>(env: *mut Env, arg: A) -> R {
+        extern "C" fn call<F: FnMut(Buffer) -> Buffer>(env: *mut Env, arg: Buffer) -> Buffer {
             unsafe { (*(env as *mut _ as *mut F))(arg) }
         }
-        Closure { call: call::<A, R, F>, env: f as *mut _ as *mut Env, _marker: PhantomData }
+        Closure { call: call::<F>, env: f as *mut _ as *mut Env, _marker: PhantomData }
     }
 }
 
-impl<'a, A, R> Closure<'a, A, R> {
-    pub(super) fn call(&mut self, arg: A) -> R {
-        unsafe { (self.call)(self.env, arg) }
+impl<'a> Closure<'a> {
+    pub(super) fn call(&mut self, arg: Buffer) -> Buffer {
+        (self.call)(self.env, arg)
     }
 }
diff --git a/library/proc_macro/src/bridge/mod.rs b/library/proc_macro/src/bridge/mod.rs
index 244ab7d81b02..6a9027046af0 100644
--- a/library/proc_macro/src/bridge/mod.rs
+++ b/library/proc_macro/src/bridge/mod.rs
@@ -18,71 +18,67 @@
 /// Higher-order macro describing the server RPC API, allowing automatic
 /// generation of type-safe Rust APIs, both client-side and server-side.
 ///
-/// `with_api!(MySelf, my_macro)` expands to:
+/// `with_api!(my_macro, MyTokenStream, MySpan, MySymbol)` expands to:
 /// ```rust,ignore (pseudo-code)
 /// my_macro! {
-///     fn lit_character(ch: char) -> MySelf::Literal;
-///     fn lit_span(lit: &MySelf::Literal) -> MySelf::Span;
-///     fn lit_set_span(lit: &mut MySelf::Literal, span: MySelf::Span);
+///     fn ts_clone(stream: &MyTokenStream) -> MyTokenStream;
+///     fn span_debug(span: &MySpan) -> String;
 ///     // ...
 /// }
 /// ```
 ///
-/// The first argument serves to customize the argument/return types,
-/// to enable several different usecases:
-///
-/// If `MySelf` is just `Self`, then the types are only valid inside
-/// a trait or a trait impl, where the trait has associated types
-/// for each of the API types. If non-associated types are desired,
-/// a module name (`self` in practice) can be used instead of `Self`.
+/// The second (`TokenStream`), third (`Span`) and fourth (`Symbol`)
+/// argument serve to customize the argument/return types that need
+/// special handling, to enable several different representations of
+/// these types.
 macro_rules! with_api {
-    ($S:ident, $m:ident) => {
+    ($m:ident, $TokenStream: path, $Span: path, $Symbol: path) => {
         $m! {
             fn injected_env_var(var: &str) -> Option<String>;
             fn track_env_var(var: &str, value: Option<&str>);
             fn track_path(path: &str);
-            fn literal_from_str(s: &str) -> Result<Literal<$S::Span, $S::Symbol>, ()>;
-            fn emit_diagnostic(diagnostic: Diagnostic<$S::Span>);
+            fn literal_from_str(s: &str) -> Result<Literal<$Span, $Symbol>, ()>;
+            fn emit_diagnostic(diagnostic: Diagnostic<$Span>);
 
-            fn ts_drop(stream: $S::TokenStream);
-            fn ts_clone(stream: &$S::TokenStream) -> $S::TokenStream;
-            fn ts_is_empty(stream: &$S::TokenStream) -> bool;
-            fn ts_expand_expr(stream: &$S::TokenStream) -> Result<$S::TokenStream, ()>;
-            fn ts_from_str(src: &str) -> $S::TokenStream;
-            fn ts_to_string(stream: &$S::TokenStream) -> String;
+            fn ts_drop(stream: $TokenStream);
+            fn ts_clone(stream: &$TokenStream) -> $TokenStream;
+            fn ts_is_empty(stream: &$TokenStream) -> bool;
+            fn ts_expand_expr(stream: &$TokenStream) -> Result<$TokenStream, ()>;
+            fn ts_from_str(src: &str) -> $TokenStream;
+            fn ts_to_string(stream: &$TokenStream) -> String;
             fn ts_from_token_tree(
-                tree: TokenTree<$S::TokenStream, $S::Span, $S::Symbol>,
-            ) -> $S::TokenStream;
+                tree: TokenTree<$TokenStream, $Span, $Symbol>,
+            ) -> $TokenStream;
             fn ts_concat_trees(
-                base: Option<$S::TokenStream>,
-                trees: Vec<TokenTree<$S::TokenStream, $S::Span, $S::Symbol>>,
-            ) -> $S::TokenStream;
+                base: Option<$TokenStream>,
+                trees: Vec<TokenTree<$TokenStream, $Span, $Symbol>>,
+            ) -> $TokenStream;
             fn ts_concat_streams(
-                base: Option<$S::TokenStream>,
-                streams: Vec<$S::TokenStream>,
-            ) -> $S::TokenStream;
+                base: Option<$TokenStream>,
+                streams: Vec<$TokenStream>,
+            ) -> $TokenStream;
             fn ts_into_trees(
-                stream: $S::TokenStream
-            ) -> Vec<TokenTree<$S::TokenStream, $S::Span, $S::Symbol>>;
+                stream: $TokenStream
+            ) -> Vec<TokenTree<$TokenStream, $Span, $Symbol>>;
 
-            fn span_debug(span: $S::Span) -> String;
-            fn span_parent(span: $S::Span) -> Option<$S::Span>;
-            fn span_source(span: $S::Span) -> $S::Span;
-            fn span_byte_range(span: $S::Span) -> Range<usize>;
-            fn span_start(span: $S::Span) -> $S::Span;
-            fn span_end(span: $S::Span) -> $S::Span;
-            fn span_line(span: $S::Span) -> usize;
-            fn span_column(span: $S::Span) -> usize;
-            fn span_file(span: $S::Span) -> String;
-            fn span_local_file(span: $S::Span) -> Option<String>;
-            fn span_join(span: $S::Span, other: $S::Span) -> Option<$S::Span>;
-            fn span_subspan(span: $S::Span, start: Bound<usize>, end: Bound<usize>) -> Option<$S::Span>;
-            fn span_resolved_at(span: $S::Span, at: $S::Span) -> $S::Span;
-            fn span_source_text(span: $S::Span) -> Option<String>;
-            fn span_save_span(span: $S::Span) -> usize;
-            fn span_recover_proc_macro_span(id: usize) -> $S::Span;
+            fn span_debug(span: $Span) -> String;
+            fn span_parent(span: $Span) -> Option<$Span>;
+            fn span_source(span: $Span) -> $Span;
+            fn span_byte_range(span: $Span) -> Range<usize>;
+            fn span_start(span: $Span) -> $Span;
+            fn span_end(span: $Span) -> $Span;
+            fn span_line(span: $Span) -> usize;
+            fn span_column(span: $Span) -> usize;
+            fn span_file(span: $Span) -> String;
+            fn span_local_file(span: $Span) -> Option<String>;
+            fn span_join(span: $Span, other: $Span) -> Option<$Span>;
+            fn span_subspan(span: $Span, start: Bound<usize>, end: Bound<usize>) -> Option<$Span>;
+            fn span_resolved_at(span: $Span, at: $Span) -> $Span;
+            fn span_source_text(span: $Span) -> Option<String>;
+            fn span_save_span(span: $Span) -> usize;
+            fn span_recover_proc_macro_span(id: usize) -> $Span;
 
-            fn symbol_normalize_and_validate_ident(string: &str) -> Result<$S::Symbol, ()>;
+            fn symbol_normalize_and_validate_ident(string: &str) -> Result<$Symbol, ()>;
         }
     };
 }
@@ -126,7 +122,7 @@ pub struct BridgeConfig<'a> {
     input: Buffer,
 
     /// Server-side function that the client uses to make requests.
-    dispatch: closure::Closure<'a, Buffer, Buffer>,
+    dispatch: closure::Closure<'a>,
 
     /// If 'true', always invoke the default panic hook
     force_show_panics: bool,
@@ -146,7 +142,7 @@ pub(super) enum ApiTags {
         rpc_encode_decode!(enum ApiTags { $($method),* });
     }
 }
-with_api!(self, declare_tags);
+with_api!(declare_tags, __, __, __);
 
 /// Helper to wrap associated types to allow trait impl dispatch.
 /// That is, normally a pair of impls for `T::Foo` and `T::Bar`
@@ -173,7 +169,7 @@ fn unmark(self) -> Self::Unmarked {
         self.value
     }
 }
-impl<'a, T, M> Mark for &'a Marked<T, M> {
+impl<'a, T> Mark for &'a Marked<T, client::TokenStream> {
     type Unmarked = &'a T;
     fn mark(_: Self::Unmarked) -> Self {
         unreachable!()
@@ -220,6 +216,8 @@ fn unmark(self) -> Self::Unmarked {
     Delimiter,
     LitKind,
     Level,
+    Bound<usize>,
+    Range<usize>,
 }
 
 rpc_encode_decode!(
@@ -318,7 +316,7 @@ macro_rules! compound_traits {
     };
 }
 
-compound_traits!(
+rpc_encode_decode!(
     enum Bound<T> {
         Included(x),
         Excluded(x),
@@ -390,7 +388,7 @@ pub struct Literal<Span, Symbol> {
     pub span: Span,
 }
 
-compound_traits!(struct Literal<Sp, Sy> { kind, symbol, suffix, span });
+compound_traits!(struct Literal<Span, Symbol> { kind, symbol, suffix, span });
 
 #[derive(Clone)]
 pub enum TokenTree<TokenStream, Span, Symbol> {
@@ -434,6 +432,6 @@ pub struct ExpnGlobals<Span> {
     struct ExpnGlobals<Span> { def_site, call_site, mixed_site }
 );
 
-compound_traits!(
+rpc_encode_decode!(
     struct Range<T> { start, end }
 );
diff --git a/library/proc_macro/src/bridge/rpc.rs b/library/proc_macro/src/bridge/rpc.rs
index 63329c8c0260..7fee8654bc78 100644
--- a/library/proc_macro/src/bridge/rpc.rs
+++ b/library/proc_macro/src/bridge/rpc.rs
@@ -52,45 +52,37 @@ fn decode(r: &mut &'a [u8], s: &mut S) -> Self {
         }
     };
     (enum $name:ident $(<$($T:ident),+>)? { $($variant:ident $(($field:ident))*),* $(,)? }) => {
-        impl<S, $($($T: Encode<S>),+)?> Encode<S> for $name $(<$($T),+>)? {
-            fn encode(self, w: &mut Buffer, s: &mut S) {
-                // HACK(eddyb): `Tag` enum duplicated between the
-                // two impls as there's no other place to stash it.
-                #[allow(non_camel_case_types)]
-                #[repr(u8)]
-                enum Tag { $($variant),* }
+        #[allow(non_upper_case_globals, non_camel_case_types)]
+        const _: () = {
+            #[repr(u8)] enum Tag { $($variant),* }
 
-                match self {
-                    $($name::$variant $(($field))* => {
-                        (Tag::$variant as u8).encode(w, s);
-                        $($field.encode(w, s);)*
-                    })*
+            $(const $variant: u8 = Tag::$variant as u8;)*
+
+            impl<S, $($($T: Encode<S>),+)?> Encode<S> for $name $(<$($T),+>)? {
+                fn encode(self, w: &mut Buffer, s: &mut S) {
+                    match self {
+                        $($name::$variant $(($field))* => {
+                            $variant.encode(w, s);
+                            $($field.encode(w, s);)*
+                        })*
+                    }
                 }
             }
-        }
 
-        impl<'a, S, $($($T: for<'s> Decode<'a, 's, S>),+)?> Decode<'a, '_, S>
-            for $name $(<$($T),+>)?
-        {
-            fn decode(r: &mut &'a [u8], s: &mut S) -> Self {
-                // HACK(eddyb): `Tag` enum duplicated between the
-                // two impls as there's no other place to stash it.
-                #[allow(non_upper_case_globals, non_camel_case_types)]
-                mod tag {
-                    #[repr(u8)] enum Tag { $($variant),* }
-
-                    $(pub(crate) const $variant: u8 = Tag::$variant as u8;)*
-                }
-
-                match u8::decode(r, s) {
-                    $(tag::$variant => {
-                        $(let $field = Decode::decode(r, s);)*
-                        $name::$variant $(($field))*
-                    })*
-                    _ => unreachable!(),
+            impl<'a, S, $($($T: for<'s> Decode<'a, 's, S>),+)?> Decode<'a, '_, S>
+                for $name $(<$($T),+>)?
+            {
+                fn decode(r: &mut &'a [u8], s: &mut S) -> Self {
+                    match u8::decode(r, s) {
+                        $($variant => {
+                            $(let $field = Decode::decode(r, s);)*
+                            $name::$variant $(($field))*
+                        })*
+                        _ => unreachable!(),
+                    }
                 }
             }
-        }
+        };
     }
 }
 
diff --git a/library/proc_macro/src/bridge/selfless_reify.rs b/library/proc_macro/src/bridge/selfless_reify.rs
index a53550e0b9e0..1a9951af8c9f 100644
--- a/library/proc_macro/src/bridge/selfless_reify.rs
+++ b/library/proc_macro/src/bridge/selfless_reify.rs
@@ -38,47 +38,27 @@
 
 use std::mem;
 
-// FIXME(eddyb) this could be `trait` impls except for the `const fn` requirement.
-macro_rules! define_reify_functions {
-    ($(
-        fn $name:ident $(<$($param:ident),*>)?
-            for $(extern $abi:tt)? fn($($arg:ident: $arg_ty:ty),*) -> $ret_ty:ty;
-    )+) => {
-        $(pub(super) const fn $name<
-            $($($param,)*)?
-            F: Fn($($arg_ty),*) -> $ret_ty + Copy
-        >(f: F) -> $(extern $abi)? fn($($arg_ty),*) -> $ret_ty {
-            // FIXME(eddyb) describe the `F` type (e.g. via `type_name::<F>`) once panic
-            // formatting becomes possible in `const fn`.
-            const { assert!(size_of::<F>() == 0, "selfless_reify: closure must be zero-sized"); }
-
-            $(extern $abi)? fn wrapper<
-                $($($param,)*)?
-                F: Fn($($arg_ty),*) -> $ret_ty + Copy
-            >($($arg: $arg_ty),*) -> $ret_ty {
-                let f = unsafe {
-                    // SAFETY: `F` satisfies all criteria for "out of thin air"
-                    // reconstructability (see module-level doc comment).
-                    mem::MaybeUninit::<F>::uninit().assume_init()
-                };
-                f($($arg),*)
-            }
-            let _f_proof = f;
-            wrapper::<
-                $($($param,)*)?
-                F
-            >
-        })+
+pub(super) const fn reify_to_extern_c_fn_hrt_bridge<
+    R,
+    F: Fn(super::BridgeConfig<'_>) -> R + Copy,
+>(
+    f: F,
+) -> extern "C" fn(super::BridgeConfig<'_>) -> R {
+    // FIXME(eddyb) describe the `F` type (e.g. via `type_name::<F>`) once panic
+    // formatting becomes possible in `const fn`.
+    const {
+        assert!(size_of::<F>() == 0, "selfless_reify: closure must be zero-sized");
     }
-}
-
-define_reify_functions! {
-    fn _reify_to_extern_c_fn_unary<A, R> for extern "C" fn(arg: A) -> R;
-
-    // HACK(eddyb) this abstraction is used with `for<'a> fn(BridgeConfig<'a>)
-    // -> T` but that doesn't work with just `reify_to_extern_c_fn_unary`
-    // because of the `fn` pointer type being "higher-ranked" (i.e. the
-    // `for<'a>` binder).
-    // FIXME(eddyb) try to remove the lifetime from `BridgeConfig`, that'd help.
-    fn reify_to_extern_c_fn_hrt_bridge<R> for extern "C" fn(bridge: super::BridgeConfig<'_>) -> R;
+    extern "C" fn wrapper<R, F: Fn(super::BridgeConfig<'_>) -> R + Copy>(
+        bridge: super::BridgeConfig<'_>,
+    ) -> R {
+        let f = unsafe {
+            // SAFETY: `F` satisfies all criteria for "out of thin air"
+            // reconstructability (see module-level doc comment).
+            mem::conjure_zst::<F>()
+        };
+        f(bridge)
+    }
+    let _f_proof = f;
+    wrapper::<R, F>
 }
diff --git a/library/proc_macro/src/bridge/server.rs b/library/proc_macro/src/bridge/server.rs
index 073ddb554994..a3c6a232264e 100644
--- a/library/proc_macro/src/bridge/server.rs
+++ b/library/proc_macro/src/bridge/server.rs
@@ -58,12 +58,12 @@ struct Dispatcher<S: Server> {
     server: S,
 }
 
-macro_rules! define_server_dispatcher_impl {
+macro_rules! define_server {
     (
         $(fn $method:ident($($arg:ident: $arg_ty:ty),* $(,)?) $(-> $ret_ty:ty)*;)*
     ) => {
         pub trait Server {
-            type TokenStream: 'static + Clone;
+            type TokenStream: 'static + Clone + Default;
             type Span: 'static + Copy + Eq + Hash;
             type Symbol: 'static;
 
@@ -77,22 +77,20 @@ pub trait Server {
 
             $(fn $method(&mut self, $($arg: $arg_ty),*) $(-> $ret_ty)?;)*
         }
+    }
+}
+with_api!(define_server, Self::TokenStream, Self::Span, Self::Symbol);
 
+macro_rules! define_dispatcher {
+    (
+        $(fn $method:ident($($arg:ident: $arg_ty:ty),* $(,)?) $(-> $ret_ty:ty)*;)*
+    ) => {
         // FIXME(eddyb) `pub` only for `ExecutionStrategy` below.
         pub trait DispatcherTrait {
-            // HACK(eddyb) these are here to allow `Self::$name` to work below.
-            type TokenStream;
-            type Span;
-            type Symbol;
-
             fn dispatch(&mut self, buf: Buffer) -> Buffer;
         }
 
         impl<S: Server> DispatcherTrait for Dispatcher<S> {
-            type TokenStream = MarkedTokenStream<S>;
-            type Span = MarkedSpan<S>;
-            type Symbol = MarkedSymbol<S>;
-
             fn dispatch(&mut self, mut buf: Buffer) -> Buffer {
                 let Dispatcher { handle_store, server } = self;
 
@@ -127,7 +125,7 @@ fn dispatch(&mut self, mut buf: Buffer) -> Buffer {
         }
     }
 }
-with_api!(Self, define_server_dispatcher_impl);
+with_api!(define_dispatcher, MarkedTokenStream<S>, MarkedSpan<S>, MarkedSymbol<S>);
 
 pub trait ExecutionStrategy {
     fn run_bridge_and_client(
@@ -312,7 +310,6 @@ pub fn run<S>(
     ) -> Result<S::TokenStream, PanicMessage>
     where
         S: Server,
-        S::TokenStream: Default,
     {
         let client::Client { handle_counters, run, _marker } = *self;
         run_server(
@@ -338,7 +335,6 @@ pub fn run<S>(
     ) -> Result<S::TokenStream, PanicMessage>
     where
         S: Server,
-        S::TokenStream: Default,
     {
         let client::Client { handle_counters, run, _marker } = *self;
         run_server(
diff --git a/library/proc_macro/src/lib.rs b/library/proc_macro/src/lib.rs
index 49b6f2ae41f8..e2f39c015bdd 100644
--- a/library/proc_macro/src/lib.rs
+++ b/library/proc_macro/src/lib.rs
@@ -27,6 +27,7 @@
 #![feature(restricted_std)]
 #![feature(rustc_attrs)]
 #![feature(extend_one)]
+#![feature(mem_conjure_zst)]
 #![recursion_limit = "256"]
 #![allow(internal_features)]
 #![deny(ffi_unwind_calls)]
diff --git a/library/std/src/path.rs b/library/std/src/path.rs
index 25bd7005b994..14b41a427f1e 100644
--- a/library/std/src/path.rs
+++ b/library/std/src/path.rs
@@ -19,6 +19,20 @@
 //! matter the platform or filesystem. An exception to this is made for Windows
 //! drive letters.
 //!
+//! ## Path normalization
+//!
+//! Several methods in this module perform basic path normalization by disregarding
+//! repeated separators, non-leading `.` components, and trailing separators. These include:
+//! - Methods for iteration, such as [`Path::components`] and [`Path::iter`]
+//! - Methods for inspection, such as [`Path::has_root`]
+//! - Comparisons using [`PartialEq`], [`PartialOrd`], and [`Ord`]
+//!
+//! [`Path::join`] and [`PathBuf::push`] also disregard trailing slashes.
+//!
+// FIXME(normalize_lexically): mention normalize_lexically once stable
+//! These methods **do not** resolve `..` components or symlinks. For full normalization
+//! including `..` resolution, use [`Path::canonicalize`] (which does access the filesystem).
+//!
 //! ## Simple usage
 //!
 //! Path manipulation includes both parsing components from slices and building
diff --git a/src/tools/compiletest/src/common.rs b/src/tools/compiletest/src/common.rs
index c71a350ffd30..54c0f2ec7430 100644
--- a/src/tools/compiletest/src/common.rs
+++ b/src/tools/compiletest/src/common.rs
@@ -949,7 +949,9 @@ fn get_current_target_config(
         // actually be changed with `-C` flags.
         for config in query_rustc_output(
             config,
-            &["--print=cfg", "--target", &config.target],
+            // `-Zunstable-options` is necessary when compiletest is running with custom targets
+            // (such as synthetic targets used to bless mir-opt tests).
+            &["-Zunstable-options", "--print=cfg", "--target", &config.target],
             Default::default(),
         )
         .trim()
diff --git a/src/tools/compiletest/src/directives/directive_names.rs b/src/tools/compiletest/src/directives/directive_names.rs
index 9813ac7ff500..230578d79ffb 100644
--- a/src/tools/compiletest/src/directives/directive_names.rs
+++ b/src/tools/compiletest/src/directives/directive_names.rs
@@ -249,6 +249,7 @@
     "only-unix",
     "only-visionos",
     "only-wasm32",
+    "only-wasm32-unknown-emscripten",
     "only-wasm32-unknown-unknown",
     "only-wasm32-wasip1",
     "only-watchos",
diff --git a/src/tools/compiletest/src/runtest.rs b/src/tools/compiletest/src/runtest.rs
index 1804490a5f12..742790a50fce 100644
--- a/src/tools/compiletest/src/runtest.rs
+++ b/src/tools/compiletest/src/runtest.rs
@@ -1670,6 +1670,11 @@ fn make_compile_args(
                 if self.props.force_host { &*self.config.host } else { &*self.config.target };
 
             compiler.arg(&format!("--target={}", target));
+            if target.ends_with(".json") {
+                // `-Zunstable-options` is necessary when compiletest is running with custom targets
+                // (such as synthetic targets used to bless mir-opt tests).
+                compiler.arg("-Zunstable-options");
+            }
         }
         self.set_revision_flags(&mut compiler);
 
diff --git a/src/tools/rust-analyzer/Cargo.lock b/src/tools/rust-analyzer/Cargo.lock
index 2cf3e37a43bc..755ae55eea46 100644
--- a/src/tools/rust-analyzer/Cargo.lock
+++ b/src/tools/rust-analyzer/Cargo.lock
@@ -1614,9 +1614,9 @@ dependencies = [
 
 [[package]]
 name = "num-conv"
-version = "0.1.0"
+version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "51d515d32fb182ee37cda2ccdcb92950d6a3c2893aa280e540671c2cd0f3b1d9"
+checksum = "cf97ec579c3c42f953ef76dbf8d55ac91fb219dde70e49aa4a6b7d74e9919050"
 
 [[package]]
 name = "num-traits"
@@ -2453,9 +2453,9 @@ checksum = "28d3b2b1366ec20994f1fd18c3c594f05c5dd4bc44d8bb0c1c632c8d6829481f"
 
 [[package]]
 name = "salsa"
-version = "0.25.2"
+version = "0.26.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e2e2aa2fca57727371eeafc975acc8e6f4c52f8166a78035543f6ee1c74c2dcc"
+checksum = "f77debccd43ba198e9cee23efd7f10330ff445e46a98a2b107fed9094a1ee676"
 dependencies = [
  "boxcar",
  "crossbeam-queue",
@@ -2478,15 +2478,15 @@ dependencies = [
 
 [[package]]
 name = "salsa-macro-rules"
-version = "0.25.2"
+version = "0.26.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1bfc2a1e7bf06964105515451d728f2422dedc3a112383324a00b191a5c397a3"
+checksum = "ea07adbf42d91cc076b7daf3b38bc8168c19eb362c665964118a89bc55ef19a5"
 
 [[package]]
 name = "salsa-macros"
-version = "0.25.2"
+version = "0.26.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3d844c1aa34946da46af683b5c27ec1088a3d9d84a2b837a108223fd830220e1"
+checksum = "d16d4d8b66451b9c75ddf740b7fc8399bc7b8ba33e854a5d7526d18708f67b05"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -2914,9 +2914,9 @@ dependencies = [
 
 [[package]]
 name = "time"
-version = "0.3.44"
+version = "0.3.47"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91e7d9e3bb61134e77bde20dd4825b97c010155709965fedf0f49bb138e52a9d"
+checksum = "743bd48c283afc0388f9b8827b976905fb217ad9e647fae3a379a9283c4def2c"
 dependencies = [
  "deranged",
  "itoa",
@@ -2924,22 +2924,22 @@ dependencies = [
  "num-conv",
  "num_threads",
  "powerfmt",
- "serde",
+ "serde_core",
  "time-core",
  "time-macros",
 ]
 
 [[package]]
 name = "time-core"
-version = "0.1.6"
+version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "40868e7c1d2f0b8d73e4a8c7f0ff63af4f6d19be117e90bd73eb1d62cf831c6b"
+checksum = "7694e1cfe791f8d31026952abf09c69ca6f6fa4e1a1229e18988f06a04a12dca"
 
 [[package]]
 name = "time-macros"
-version = "0.2.24"
+version = "0.2.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "30cfb0125f12d9c277f35663a0a33f8c30190f4e4574868a330595412d34ebf3"
+checksum = "2e70e4c5a0e0a8a4823ad65dfe1a6930e4f4d756dcd9dd7939022b5e8c501215"
 dependencies = [
  "num-conv",
  "time-core",
diff --git a/src/tools/rust-analyzer/Cargo.toml b/src/tools/rust-analyzer/Cargo.toml
index 2288933a96cc..04559f15eda4 100644
--- a/src/tools/rust-analyzer/Cargo.toml
+++ b/src/tools/rust-analyzer/Cargo.toml
@@ -135,13 +135,13 @@ rayon = "1.10.0"
 rowan = "=0.15.17"
 # Ideally we'd not enable the macros feature but unfortunately the `tracked` attribute does not work
 # on impls without it
-salsa = { version = "0.25.2", default-features = false, features = [
+salsa = { version = "0.26", default-features = false, features = [
     "rayon",
     "salsa_unstable",
     "macros",
     "inventory",
 ] }
-salsa-macros = "0.25.2"
+salsa-macros = "0.26"
 semver = "1.0.26"
 serde = { version = "1.0.219" }
 serde_derive = { version = "1.0.219" }
@@ -192,8 +192,6 @@ unused_lifetimes = "warn"
 unreachable_pub = "warn"
 
 [workspace.lints.clippy]
-# FIXME Remove the tidy test once the lint table is stable
-
 ## lint groups
 complexity = { level = "warn", priority = -1 }
 correctness = { level = "deny", priority = -1 }
diff --git a/src/tools/rust-analyzer/bench_data/glorious_old_parser b/src/tools/rust-analyzer/bench_data/glorious_old_parser
index f593f2b2955a..8136daa8329f 100644
Binary files a/src/tools/rust-analyzer/bench_data/glorious_old_parser and b/src/tools/rust-analyzer/bench_data/glorious_old_parser differ
diff --git a/src/tools/rust-analyzer/crates/base-db/src/editioned_file_id.rs b/src/tools/rust-analyzer/crates/base-db/src/editioned_file_id.rs
index 13fb05d56547..dd419f48fc7e 100644
--- a/src/tools/rust-analyzer/crates/base-db/src/editioned_file_id.rs
+++ b/src/tools/rust-analyzer/crates/base-db/src/editioned_file_id.rs
@@ -60,7 +60,7 @@ fn hash<H: Hasher>(&self, state: &mut H) {
         }
     }
 
-    impl zalsa_struct_::HashEqLike<WithoutCrate> for EditionedFileIdData {
+    impl zalsa_::HashEqLike<WithoutCrate> for EditionedFileIdData {
         #[inline]
         fn hash<H: Hasher>(&self, state: &mut H) {
             Hash::hash(self, state);
diff --git a/src/tools/rust-analyzer/crates/edition/src/lib.rs b/src/tools/rust-analyzer/crates/edition/src/lib.rs
index f1a1fe596493..eb4cec39dce0 100644
--- a/src/tools/rust-analyzer/crates/edition/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/edition/src/lib.rs
@@ -16,8 +16,6 @@ impl Edition {
     pub const DEFAULT: Edition = Edition::Edition2015;
     pub const LATEST: Edition = Edition::Edition2024;
     pub const CURRENT: Edition = Edition::Edition2024;
-    /// The current latest stable edition, note this is usually not the right choice in code.
-    pub const CURRENT_FIXME: Edition = Edition::Edition2024;
 
     pub fn from_u32(u32: u32) -> Edition {
         match u32 {
diff --git a/src/tools/rust-analyzer/crates/hir-def/src/expr_store/lower.rs b/src/tools/rust-analyzer/crates/hir-def/src/expr_store/lower.rs
index 4fbf6d951779..701586c25838 100644
--- a/src/tools/rust-analyzer/crates/hir-def/src/expr_store/lower.rs
+++ b/src/tools/rust-analyzer/crates/hir-def/src/expr_store/lower.rs
@@ -426,7 +426,7 @@ pub struct ExprCollector<'db> {
     /// and we need to find the current definition. So we track the number of definitions we saw.
     current_block_legacy_macro_defs_count: FxHashMap<Name, usize>,
 
-    current_try_block_label: Option<LabelId>,
+    current_try_block: Option<TryBlock>,
 
     label_ribs: Vec<LabelRib>,
     unowned_bindings: Vec<BindingId>,
@@ -472,6 +472,13 @@ enum Awaitable {
     No(&'static str),
 }
 
+enum TryBlock {
+    // `try { ... }`
+    Homogeneous { label: LabelId },
+    // `try bikeshed Ty { ... }`
+    Heterogeneous { label: LabelId },
+}
+
 #[derive(Debug, Default)]
 struct BindingList {
     map: FxHashMap<(Name, HygieneId), BindingId>,
@@ -532,7 +539,7 @@ pub fn new(
             lang_items: OnceCell::new(),
             store: ExpressionStoreBuilder::default(),
             expander,
-            current_try_block_label: None,
+            current_try_block: None,
             is_lowering_coroutine: false,
             label_ribs: Vec::new(),
             unowned_bindings: Vec::new(),
@@ -1069,7 +1076,9 @@ fn maybe_collect_expr(&mut self, expr: ast::Expr) -> Option<ExprId> {
                 self.alloc_expr(Expr::Let { pat, expr }, syntax_ptr)
             }
             ast::Expr::BlockExpr(e) => match e.modifier() {
-                Some(ast::BlockModifier::Try(_)) => self.desugar_try_block(e),
+                Some(ast::BlockModifier::Try { try_token: _, bikeshed_token: _, result_type }) => {
+                    self.desugar_try_block(e, result_type)
+                }
                 Some(ast::BlockModifier::Unsafe(_)) => {
                     self.collect_block_(e, |id, statements, tail| Expr::Unsafe {
                         id,
@@ -1344,7 +1353,7 @@ fn maybe_collect_expr(&mut self, expr: ast::Expr) -> Option<ExprId> {
                         .map(|it| this.lower_type_ref_disallow_impl_trait(it));
 
                     let prev_is_lowering_coroutine = mem::take(&mut this.is_lowering_coroutine);
-                    let prev_try_block_label = this.current_try_block_label.take();
+                    let prev_try_block = this.current_try_block.take();
 
                     let awaitable = if e.async_token().is_some() {
                         Awaitable::Yes
@@ -1369,7 +1378,7 @@ fn maybe_collect_expr(&mut self, expr: ast::Expr) -> Option<ExprId> {
                     let capture_by =
                         if e.move_token().is_some() { CaptureBy::Value } else { CaptureBy::Ref };
                     this.is_lowering_coroutine = prev_is_lowering_coroutine;
-                    this.current_try_block_label = prev_try_block_label;
+                    this.current_try_block = prev_try_block;
                     this.alloc_expr(
                         Expr::Closure {
                             args: args.into(),
@@ -1686,11 +1695,15 @@ fn with_binding_owner(&mut self, create_expr: impl FnOnce(&mut Self) -> ExprId)
     /// Desugar `try { <stmts>; <expr> }` into `'<new_label>: { <stmts>; ::std::ops::Try::from_output(<expr>) }`,
     /// `try { <stmts>; }` into `'<new_label>: { <stmts>; ::std::ops::Try::from_output(()) }`
     /// and save the `<new_label>` to use it as a break target for desugaring of the `?` operator.
-    fn desugar_try_block(&mut self, e: BlockExpr) -> ExprId {
+    fn desugar_try_block(&mut self, e: BlockExpr, result_type: Option<ast::Type>) -> ExprId {
         let try_from_output = self.lang_path(self.lang_items().TryTraitFromOutput);
         let label = self.generate_new_name();
         let label = self.alloc_label_desugared(Label { name: label }, AstPtr::new(&e).wrap_right());
-        let old_label = self.current_try_block_label.replace(label);
+        let try_block_info = match result_type {
+            Some(_) => TryBlock::Heterogeneous { label },
+            None => TryBlock::Homogeneous { label },
+        };
+        let old_try_block = self.current_try_block.replace(try_block_info);
 
         let ptr = AstPtr::new(&e).upcast();
         let (btail, expr_id) = self.with_labeled_rib(label, HygieneId::ROOT, |this| {
@@ -1720,8 +1733,38 @@ fn desugar_try_block(&mut self, e: BlockExpr) -> ExprId {
             unreachable!("block was lowered to non-block");
         };
         *tail = Some(next_tail);
-        self.current_try_block_label = old_label;
-        expr_id
+        self.current_try_block = old_try_block;
+        match result_type {
+            Some(ty) => {
+                // `{ let <name>: <ty> = <expr>; <name> }`
+                let name = self.generate_new_name();
+                let type_ref = self.lower_type_ref_disallow_impl_trait(ty);
+                let binding = self.alloc_binding(
+                    name.clone(),
+                    BindingAnnotation::Unannotated,
+                    HygieneId::ROOT,
+                );
+                let pat = self.alloc_pat_desugared(Pat::Bind { id: binding, subpat: None });
+                self.add_definition_to_binding(binding, pat);
+                let tail_expr =
+                    self.alloc_expr_desugared_with_ptr(Expr::Path(Path::from(name)), ptr);
+                self.alloc_expr_desugared_with_ptr(
+                    Expr::Block {
+                        id: None,
+                        statements: Box::new([Statement::Let {
+                            pat,
+                            type_ref: Some(type_ref),
+                            initializer: Some(expr_id),
+                            else_branch: None,
+                        }]),
+                        tail: Some(tail_expr),
+                        label: None,
+                    },
+                    ptr,
+                )
+            }
+            None => expr_id,
+        }
     }
 
     /// Desugar `ast::WhileExpr` from: `[opt_ident]: while <cond> <body>` into:
@@ -1863,6 +1906,8 @@ fn collect_for_loop(&mut self, syntax_ptr: AstPtr<ast::Expr>, e: ast::ForExpr) -
     ///     ControlFlow::Continue(val) => val,
     ///     ControlFlow::Break(residual) =>
     ///         // If there is an enclosing `try {...}`:
+    ///         break 'catch_target Residual::into_try_type(residual),
+    ///         // If there is an enclosing `try bikeshed Ty {...}`:
     ///         break 'catch_target Try::from_residual(residual),
     ///         // Otherwise:
     ///         return Try::from_residual(residual),
@@ -1873,7 +1918,6 @@ fn collect_try_operator(&mut self, syntax_ptr: AstPtr<ast::Expr>, e: ast::TryExp
         let try_branch = self.lang_path(lang_items.TryTraitBranch);
         let cf_continue = self.lang_path(lang_items.ControlFlowContinue);
         let cf_break = self.lang_path(lang_items.ControlFlowBreak);
-        let try_from_residual = self.lang_path(lang_items.TryTraitFromResidual);
         let operand = self.collect_expr_opt(e.expr());
         let try_branch = self.alloc_expr(try_branch.map_or(Expr::Missing, Expr::Path), syntax_ptr);
         let expr = self
@@ -1910,13 +1954,23 @@ fn collect_try_operator(&mut self, syntax_ptr: AstPtr<ast::Expr>, e: ast::TryExp
             guard: None,
             expr: {
                 let it = self.alloc_expr(Expr::Path(Path::from(break_name)), syntax_ptr);
-                let callee = self
-                    .alloc_expr(try_from_residual.map_or(Expr::Missing, Expr::Path), syntax_ptr);
+                let convert_fn = match self.current_try_block {
+                    Some(TryBlock::Homogeneous { .. }) => {
+                        self.lang_path(lang_items.ResidualIntoTryType)
+                    }
+                    Some(TryBlock::Heterogeneous { .. }) | None => {
+                        self.lang_path(lang_items.TryTraitFromResidual)
+                    }
+                };
+                let callee =
+                    self.alloc_expr(convert_fn.map_or(Expr::Missing, Expr::Path), syntax_ptr);
                 let result =
                     self.alloc_expr(Expr::Call { callee, args: Box::new([it]) }, syntax_ptr);
                 self.alloc_expr(
-                    match self.current_try_block_label {
-                        Some(label) => Expr::Break { expr: Some(result), label: Some(label) },
+                    match self.current_try_block {
+                        Some(
+                            TryBlock::Heterogeneous { label } | TryBlock::Homogeneous { label },
+                        ) => Expr::Break { expr: Some(result), label: Some(label) },
                         None => Expr::Return { expr: Some(result) },
                     },
                     syntax_ptr,
diff --git a/src/tools/rust-analyzer/crates/hir-def/src/item_scope.rs b/src/tools/rust-analyzer/crates/hir-def/src/item_scope.rs
index 9e1efb977786..1303773b59d4 100644
--- a/src/tools/rust-analyzer/crates/hir-def/src/item_scope.rs
+++ b/src/tools/rust-analyzer/crates/hir-def/src/item_scope.rs
@@ -893,6 +893,24 @@ pub(crate) fn update_visibility_macros(&mut self, name: &Name, vis: Visibility)
             self.macros.get_mut(name).expect("tried to update visibility of non-existent macro");
         res.vis = vis;
     }
+
+    pub(crate) fn update_def_types(&mut self, name: &Name, def: ModuleDefId, vis: Visibility) {
+        let res = self.types.get_mut(name).expect("tried to update def of non-existent type");
+        res.def = def;
+        res.vis = vis;
+    }
+
+    pub(crate) fn update_def_values(&mut self, name: &Name, def: ModuleDefId, vis: Visibility) {
+        let res = self.values.get_mut(name).expect("tried to update def of non-existent value");
+        res.def = def;
+        res.vis = vis;
+    }
+
+    pub(crate) fn update_def_macros(&mut self, name: &Name, def: MacroId, vis: Visibility) {
+        let res = self.macros.get_mut(name).expect("tried to update def of non-existent macro");
+        res.def = def;
+        res.vis = vis;
+    }
 }
 
 impl PerNs {
diff --git a/src/tools/rust-analyzer/crates/hir-def/src/lang_item.rs b/src/tools/rust-analyzer/crates/hir-def/src/lang_item.rs
index 51dd55301f44..fef92c89b145 100644
--- a/src/tools/rust-analyzer/crates/hir-def/src/lang_item.rs
+++ b/src/tools/rust-analyzer/crates/hir-def/src/lang_item.rs
@@ -456,6 +456,7 @@ pub fn from_symbol(symbol: &Symbol) -> Option<Self> {
     TryTraitFromOutput,      sym::from_output,         FunctionId;
     TryTraitBranch,          sym::branch,              FunctionId;
     TryTraitFromYeet,        sym::from_yeet,           FunctionId;
+    ResidualIntoTryType,     sym::into_try_type,       FunctionId;
 
     PointerLike,             sym::pointer_like,        TraitId;
 
diff --git a/src/tools/rust-analyzer/crates/hir-def/src/nameres/collector.rs b/src/tools/rust-analyzer/crates/hir-def/src/nameres/collector.rs
index 323060f61d15..f51524c1b551 100644
--- a/src/tools/rust-analyzer/crates/hir-def/src/nameres/collector.rs
+++ b/src/tools/rust-analyzer/crates/hir-def/src/nameres/collector.rs
@@ -1209,42 +1209,69 @@ fn push_res_and_update_glob_vis(
             // `ItemScope::push_res_with_import()`.
             if let Some(def) = defs.types
                 && let Some(prev_def) = prev_defs.types
-                && def.def == prev_def.def
-                && self.from_glob_import.contains_type(module_id, name.clone())
-                && def.vis != prev_def.vis
-                && def.vis.max(self.db, prev_def.vis, &self.def_map) == Some(def.vis)
             {
-                changed = true;
-                // This import is being handled here, don't pass it down to
-                // `ItemScope::push_res_with_import()`.
-                defs.types = None;
-                self.def_map.modules[module_id].scope.update_visibility_types(name, def.vis);
+                if def.def == prev_def.def
+                    && self.from_glob_import.contains_type(module_id, name.clone())
+                    && def.vis != prev_def.vis
+                    && def.vis.max(self.db, prev_def.vis, &self.def_map) == Some(def.vis)
+                {
+                    changed = true;
+                    // This import is being handled here, don't pass it down to
+                    // `ItemScope::push_res_with_import()`.
+                    defs.types = None;
+                    self.def_map.modules[module_id].scope.update_visibility_types(name, def.vis);
+                }
+                // When the source module's definition changed (e.g., due to an explicit import
+                // shadowing a glob), propagate the new definition to modules that glob-import from it.
+                // We check that the previous definition came from the same glob import to avoid
+                // incorrectly overwriting definitions from different glob sources.
+                //
+                // Note this is not a perfect fix, but it makes
+                // https://github.com/rust-lang/rust-analyzer/issues/19224 work for now until we
+                // implement a proper glob graph
+                else if def.def != prev_def.def && prev_def.import == def_import_type {
+                    changed = true;
+                    defs.types = None;
+                    self.def_map.modules[module_id].scope.update_def_types(name, def.def, def.vis);
+                }
             }
 
             if let Some(def) = defs.values
                 && let Some(prev_def) = prev_defs.values
-                && def.def == prev_def.def
-                && self.from_glob_import.contains_value(module_id, name.clone())
-                && def.vis != prev_def.vis
-                && def.vis.max(self.db, prev_def.vis, &self.def_map) == Some(def.vis)
             {
-                changed = true;
-                // See comment above.
-                defs.values = None;
-                self.def_map.modules[module_id].scope.update_visibility_values(name, def.vis);
+                if def.def == prev_def.def
+                    && self.from_glob_import.contains_value(module_id, name.clone())
+                    && def.vis != prev_def.vis
+                    && def.vis.max(self.db, prev_def.vis, &self.def_map) == Some(def.vis)
+                {
+                    changed = true;
+                    defs.values = None;
+                    self.def_map.modules[module_id].scope.update_visibility_values(name, def.vis);
+                } else if def.def != prev_def.def
+                    && prev_def.import.map(ImportOrExternCrate::from) == def_import_type
+                {
+                    changed = true;
+                    defs.values = None;
+                    self.def_map.modules[module_id].scope.update_def_values(name, def.def, def.vis);
+                }
             }
 
             if let Some(def) = defs.macros
                 && let Some(prev_def) = prev_defs.macros
-                && def.def == prev_def.def
-                && self.from_glob_import.contains_macro(module_id, name.clone())
-                && def.vis != prev_def.vis
-                && def.vis.max(self.db, prev_def.vis, &self.def_map) == Some(def.vis)
             {
-                changed = true;
-                // See comment above.
-                defs.macros = None;
-                self.def_map.modules[module_id].scope.update_visibility_macros(name, def.vis);
+                if def.def == prev_def.def
+                    && self.from_glob_import.contains_macro(module_id, name.clone())
+                    && def.vis != prev_def.vis
+                    && def.vis.max(self.db, prev_def.vis, &self.def_map) == Some(def.vis)
+                {
+                    changed = true;
+                    defs.macros = None;
+                    self.def_map.modules[module_id].scope.update_visibility_macros(name, def.vis);
+                } else if def.def != prev_def.def && prev_def.import == def_import_type {
+                    changed = true;
+                    defs.macros = None;
+                    self.def_map.modules[module_id].scope.update_def_macros(name, def.def, def.vis);
+                }
             }
         }
 
diff --git a/src/tools/rust-analyzer/crates/hir-expand/src/builtin/fn_macro.rs b/src/tools/rust-analyzer/crates/hir-expand/src/builtin/fn_macro.rs
index 6e4b96b05088..3029bca1d51f 100644
--- a/src/tools/rust-analyzer/crates/hir-expand/src/builtin/fn_macro.rs
+++ b/src/tools/rust-analyzer/crates/hir-expand/src/builtin/fn_macro.rs
@@ -830,15 +830,18 @@ fn include_bytes_expand(
     span: Span,
 ) -> ExpandResult<tt::TopSubtree> {
     // FIXME: actually read the file here if the user asked for macro expansion
-    let res = tt::TopSubtree::invisible_from_leaves(
+    let underscore = sym::underscore;
+    let zero = tt::Literal {
+        text_and_suffix: sym::_0_u8,
         span,
-        [tt::Leaf::Literal(tt::Literal {
-            text_and_suffix: Symbol::empty(),
-            span,
-            kind: tt::LitKind::ByteStrRaw(1),
-            suffix_len: 0,
-        })],
-    );
+        kind: tt::LitKind::Integer,
+        suffix_len: 3,
+    };
+    // We don't use a real length since we can't know the file length, so we use an underscore
+    // to infer it.
+    let res = quote! {span =>
+        &[#zero; #underscore]
+    };
     ExpandResult::ok(res)
 }
 
diff --git a/src/tools/rust-analyzer/crates/hir-ty/src/builtin_derive.rs b/src/tools/rust-analyzer/crates/hir-ty/src/builtin_derive.rs
index f3e67d01e566..0c3c51366861 100644
--- a/src/tools/rust-analyzer/crates/hir-ty/src/builtin_derive.rs
+++ b/src/tools/rust-analyzer/crates/hir-ty/src/builtin_derive.rs
@@ -133,7 +133,7 @@ pub fn impl_trait<'db>(
     }
 }
 
-#[salsa::tracked(returns(ref), unsafe(non_update_types))]
+#[salsa::tracked(returns(ref))]
 pub fn predicates<'db>(db: &'db dyn HirDatabase, impl_: BuiltinDeriveImplId) -> GenericPredicates {
     let loc = impl_.loc(db);
     let generic_params = GenericParams::new(db, loc.adt.into());
diff --git a/src/tools/rust-analyzer/crates/hir-ty/src/display.rs b/src/tools/rust-analyzer/crates/hir-ty/src/display.rs
index 43b428c3fa51..4e77e8be364b 100644
--- a/src/tools/rust-analyzer/crates/hir-ty/src/display.rs
+++ b/src/tools/rust-analyzer/crates/hir-ty/src/display.rs
@@ -12,7 +12,6 @@
 use hir_def::{
     FindPathConfig, GenericDefId, GenericParamId, HasModule, LocalFieldId, Lookup, ModuleDefId,
     ModuleId, TraitId,
-    db::DefDatabase,
     expr_store::{ExpressionStore, path::Path},
     find_path::{self, PrefixKind},
     hir::generics::{TypeOrConstParamData, TypeParamProvenance, WherePredicate},
@@ -100,6 +99,9 @@ pub struct HirFormatter<'a, 'db> {
     display_kind: DisplayKind,
     display_target: DisplayTarget,
     bounds_formatting_ctx: BoundsFormattingCtx<'db>,
+    /// Whether formatting `impl Trait1 + Trait2` or `dyn Trait1 + Trait2` needs parentheses around it,
+    /// for example when formatting `&(impl Trait1 + Trait2)`.
+    trait_bounds_need_parens: bool,
 }
 
 // FIXME: To consider, ref and dyn trait lifetimes can be omitted if they are `'_`, path args should
@@ -331,6 +333,7 @@ fn display_source_code<'a>(
             show_container_bounds: false,
             display_lifetimes: DisplayLifetime::OnlyNamedOrStatic,
             bounds_formatting_ctx: Default::default(),
+            trait_bounds_need_parens: false,
         }) {
             Ok(()) => {}
             Err(HirDisplayError::FmtError) => panic!("Writing to String can't fail!"),
@@ -566,6 +569,7 @@ pub fn write_to<F: HirWrite>(&self, f: &mut F) -> Result {
             show_container_bounds: self.show_container_bounds,
             display_lifetimes: self.display_lifetimes,
             bounds_formatting_ctx: Default::default(),
+            trait_bounds_need_parens: false,
         })
     }
 
@@ -612,7 +616,11 @@ fn hir_fmt(&self, f: &mut HirFormatter<'_, 'db>) -> Result {
     }
 }
 
-fn write_projection<'db>(f: &mut HirFormatter<'_, 'db>, alias: &AliasTy<'db>) -> Result {
+fn write_projection<'db>(
+    f: &mut HirFormatter<'_, 'db>,
+    alias: &AliasTy<'db>,
+    needs_parens_if_multi: bool,
+) -> Result {
     if f.should_truncate() {
         return write!(f, "{TYPE_HINT_TRUNCATION}");
     }
@@ -650,6 +658,7 @@ fn write_projection<'db>(f: &mut HirFormatter<'_, 'db>, alias: &AliasTy<'db>) ->
                     Either::Left(Ty::new_alias(f.interner, AliasTyKind::Projection, *alias)),
                     &bounds,
                     SizedByDefault::NotSized,
+                    needs_parens_if_multi,
                 )
             });
         }
@@ -1056,7 +1065,7 @@ fn hir_fmt(&self, f @ &mut HirFormatter { db, .. }: &mut HirFormatter<'_, 'db>)
             return write!(f, "{TYPE_HINT_TRUNCATION}");
         }
 
-        use TyKind;
+        let trait_bounds_need_parens = mem::replace(&mut f.trait_bounds_need_parens, false);
         match self.kind() {
             TyKind::Never => write!(f, "!")?,
             TyKind::Str => write!(f, "str")?,
@@ -1077,103 +1086,34 @@ fn hir_fmt(&self, f @ &mut HirFormatter { db, .. }: &mut HirFormatter<'_, 'db>)
                 c.hir_fmt(f)?;
                 write!(f, "]")?;
             }
-            kind @ (TyKind::RawPtr(t, m) | TyKind::Ref(_, t, m)) => {
-                if let TyKind::Ref(l, _, _) = kind {
-                    f.write_char('&')?;
-                    if f.render_region(l) {
-                        l.hir_fmt(f)?;
-                        f.write_char(' ')?;
-                    }
+            TyKind::Ref(l, t, m) => {
+                f.write_char('&')?;
+                if f.render_region(l) {
+                    l.hir_fmt(f)?;
+                    f.write_char(' ')?;
+                }
+                match m {
+                    rustc_ast_ir::Mutability::Not => (),
+                    rustc_ast_ir::Mutability::Mut => f.write_str("mut ")?,
+                }
+
+                f.trait_bounds_need_parens = true;
+                t.hir_fmt(f)?;
+                f.trait_bounds_need_parens = false;
+            }
+            TyKind::RawPtr(t, m) => {
+                write!(
+                    f,
+                    "*{}",
                     match m {
-                        rustc_ast_ir::Mutability::Not => (),
-                        rustc_ast_ir::Mutability::Mut => f.write_str("mut ")?,
+                        rustc_ast_ir::Mutability::Not => "const ",
+                        rustc_ast_ir::Mutability::Mut => "mut ",
                     }
-                } else {
-                    write!(
-                        f,
-                        "*{}",
-                        match m {
-                            rustc_ast_ir::Mutability::Not => "const ",
-                            rustc_ast_ir::Mutability::Mut => "mut ",
-                        }
-                    )?;
-                }
+                )?;
 
-                // FIXME: all this just to decide whether to use parentheses...
-                let (preds_to_print, has_impl_fn_pred) = match t.kind() {
-                    TyKind::Dynamic(bounds, region) => {
-                        let contains_impl_fn =
-                            bounds.iter().any(|bound| match bound.skip_binder() {
-                                ExistentialPredicate::Trait(trait_ref) => {
-                                    let trait_ = trait_ref.def_id.0;
-                                    fn_traits(f.lang_items()).any(|it| it == trait_)
-                                }
-                                _ => false,
-                            });
-                        let render_lifetime = f.render_region(region);
-                        (bounds.len() + render_lifetime as usize, contains_impl_fn)
-                    }
-                    TyKind::Alias(AliasTyKind::Opaque, ty) => {
-                        let opaque_ty_id = match ty.def_id {
-                            SolverDefId::InternedOpaqueTyId(id) => id,
-                            _ => unreachable!(),
-                        };
-                        let impl_trait_id = db.lookup_intern_impl_trait_id(opaque_ty_id);
-                        if let ImplTraitId::ReturnTypeImplTrait(func, _) = impl_trait_id {
-                            let data = impl_trait_id.predicates(db);
-                            let bounds =
-                                || data.iter_instantiated_copied(f.interner, ty.args.as_slice());
-                            let mut len = bounds().count();
-
-                            // Don't count Sized but count when it absent
-                            // (i.e. when explicit ?Sized bound is set).
-                            let default_sized = SizedByDefault::Sized { anchor: func.krate(db) };
-                            let sized_bounds = bounds()
-                                .filter(|b| {
-                                    matches!(
-                                        b.kind().skip_binder(),
-                                        ClauseKind::Trait(trait_ref)
-                                            if default_sized.is_sized_trait(
-                                                trait_ref.def_id().0,
-                                                db,
-                                            ),
-                                    )
-                                })
-                                .count();
-                            match sized_bounds {
-                                0 => len += 1,
-                                _ => {
-                                    len = len.saturating_sub(sized_bounds);
-                                }
-                            }
-
-                            let contains_impl_fn = bounds().any(|bound| {
-                                if let ClauseKind::Trait(trait_ref) = bound.kind().skip_binder() {
-                                    let trait_ = trait_ref.def_id().0;
-                                    fn_traits(f.lang_items()).any(|it| it == trait_)
-                                } else {
-                                    false
-                                }
-                            });
-                            (len, contains_impl_fn)
-                        } else {
-                            (0, false)
-                        }
-                    }
-                    _ => (0, false),
-                };
-
-                if has_impl_fn_pred && preds_to_print <= 2 {
-                    return t.hir_fmt(f);
-                }
-
-                if preds_to_print > 1 {
-                    write!(f, "(")?;
-                    t.hir_fmt(f)?;
-                    write!(f, ")")?;
-                } else {
-                    t.hir_fmt(f)?;
-                }
+                f.trait_bounds_need_parens = true;
+                t.hir_fmt(f)?;
+                f.trait_bounds_need_parens = false;
             }
             TyKind::Tuple(tys) => {
                 if tys.len() == 1 {
@@ -1328,7 +1268,9 @@ fn hir_fmt(&self, f @ &mut HirFormatter { db, .. }: &mut HirFormatter<'_, 'db>)
 
                 hir_fmt_generics(f, parameters.as_slice(), Some(def.def_id().0.into()), None)?;
             }
-            TyKind::Alias(AliasTyKind::Projection, alias_ty) => write_projection(f, &alias_ty)?,
+            TyKind::Alias(AliasTyKind::Projection, alias_ty) => {
+                write_projection(f, &alias_ty, trait_bounds_need_parens)?
+            }
             TyKind::Foreign(alias) => {
                 let type_alias = db.type_alias_signature(alias.0);
                 f.start_location_link(alias.0.into());
@@ -1363,6 +1305,7 @@ fn hir_fmt(&self, f @ &mut HirFormatter { db, .. }: &mut HirFormatter<'_, 'db>)
                     Either::Left(*self),
                     &bounds,
                     SizedByDefault::Sized { anchor: krate },
+                    trait_bounds_need_parens,
                 )?;
             }
             TyKind::Closure(id, substs) => {
@@ -1525,6 +1468,7 @@ fn hir_fmt(&self, f @ &mut HirFormatter { db, .. }: &mut HirFormatter<'_, 'db>)
                                 Either::Left(*self),
                                 &bounds,
                                 SizedByDefault::Sized { anchor: krate },
+                                trait_bounds_need_parens,
                             )?;
                         }
                     },
@@ -1567,6 +1511,7 @@ fn hir_fmt(&self, f @ &mut HirFormatter { db, .. }: &mut HirFormatter<'_, 'db>)
                     Either::Left(*self),
                     &bounds_to_display,
                     SizedByDefault::NotSized,
+                    trait_bounds_need_parens,
                 )?;
             }
             TyKind::Error(_) => {
@@ -1806,11 +1751,11 @@ pub enum SizedByDefault {
 }
 
 impl SizedByDefault {
-    fn is_sized_trait(self, trait_: TraitId, db: &dyn DefDatabase) -> bool {
+    fn is_sized_trait(self, trait_: TraitId, interner: DbInterner<'_>) -> bool {
         match self {
             Self::NotSized => false,
-            Self::Sized { anchor } => {
-                let sized_trait = hir_def::lang_item::lang_items(db, anchor).Sized;
+            Self::Sized { .. } => {
+                let sized_trait = interner.lang_items().Sized;
                 Some(trait_) == sized_trait
             }
         }
@@ -1823,16 +1768,62 @@ pub fn write_bounds_like_dyn_trait_with_prefix<'db>(
     this: Either<Ty<'db>, Region<'db>>,
     predicates: &[Clause<'db>],
     default_sized: SizedByDefault,
+    needs_parens_if_multi: bool,
 ) -> Result {
+    let needs_parens =
+        needs_parens_if_multi && trait_bounds_need_parens(f, this, predicates, default_sized);
+    if needs_parens {
+        write!(f, "(")?;
+    }
     write!(f, "{prefix}")?;
     if !predicates.is_empty()
         || predicates.is_empty() && matches!(default_sized, SizedByDefault::Sized { .. })
     {
         write!(f, " ")?;
-        write_bounds_like_dyn_trait(f, this, predicates, default_sized)
-    } else {
-        Ok(())
+        write_bounds_like_dyn_trait(f, this, predicates, default_sized)?;
     }
+    if needs_parens {
+        write!(f, ")")?;
+    }
+    Ok(())
+}
+
+fn trait_bounds_need_parens<'db>(
+    f: &mut HirFormatter<'_, 'db>,
+    this: Either<Ty<'db>, Region<'db>>,
+    predicates: &[Clause<'db>],
+    default_sized: SizedByDefault,
+) -> bool {
+    // This needs to be kept in sync with `write_bounds_like_dyn_trait()`.
+    let mut distinct_bounds = 0usize;
+    let mut is_sized = false;
+    for p in predicates {
+        match p.kind().skip_binder() {
+            ClauseKind::Trait(trait_ref) => {
+                let trait_ = trait_ref.def_id().0;
+                if default_sized.is_sized_trait(trait_, f.interner) {
+                    is_sized = true;
+                    if matches!(default_sized, SizedByDefault::Sized { .. }) {
+                        // Don't print +Sized, but rather +?Sized if absent.
+                        continue;
+                    }
+                }
+
+                distinct_bounds += 1;
+            }
+            ClauseKind::TypeOutlives(to) if Either::Left(to.0) == this => distinct_bounds += 1,
+            ClauseKind::RegionOutlives(lo) if Either::Right(lo.0) == this => distinct_bounds += 1,
+            _ => {}
+        }
+    }
+
+    if let SizedByDefault::Sized { .. } = default_sized
+        && !is_sized
+    {
+        distinct_bounds += 1;
+    }
+
+    distinct_bounds > 1
 }
 
 fn write_bounds_like_dyn_trait<'db>(
@@ -1855,7 +1846,7 @@ fn write_bounds_like_dyn_trait<'db>(
         match p.kind().skip_binder() {
             ClauseKind::Trait(trait_ref) => {
                 let trait_ = trait_ref.def_id().0;
-                if default_sized.is_sized_trait(trait_, f.db) {
+                if default_sized.is_sized_trait(trait_, f.interner) {
                     is_sized = true;
                     if matches!(default_sized, SizedByDefault::Sized { .. }) {
                         // Don't print +Sized, but rather +?Sized if absent.
diff --git a/src/tools/rust-analyzer/crates/hir-ty/src/lower.rs b/src/tools/rust-analyzer/crates/hir-ty/src/lower.rs
index 5789bf02a42e..386556b15684 100644
--- a/src/tools/rust-analyzer/crates/hir-ty/src/lower.rs
+++ b/src/tools/rust-analyzer/crates/hir-ty/src/lower.rs
@@ -831,6 +831,8 @@ fn lower_dyn_trait(&mut self, bounds: &[TypeBound]) -> Ty<'db> {
             let mut ordered_associated_types = vec![];
 
             if let Some(principal_trait) = principal {
+                // Generally we should not elaborate in lowering as this can lead to cycles, but
+                // here rustc cycles as well.
                 for clause in elaborate::elaborate(
                     interner,
                     [Clause::upcast_from(
@@ -1897,7 +1899,7 @@ impl<'db> GenericPredicates {
     /// Resolve the where clause(s) of an item with generics.
     ///
     /// Diagnostics are computed only for this item's predicates, not for parents.
-    #[salsa::tracked(returns(ref))]
+    #[salsa::tracked(returns(ref), cycle_result=generic_predicates_cycle_result)]
     pub fn query_with_diagnostics(
         db: &'db dyn HirDatabase,
         def: GenericDefId,
@@ -1906,6 +1908,20 @@ pub fn query_with_diagnostics(
     }
 }
 
+/// A cycle can occur from malformed code.
+fn generic_predicates_cycle_result(
+    _db: &dyn HirDatabase,
+    _: salsa::Id,
+    _def: GenericDefId,
+) -> (GenericPredicates, Diagnostics) {
+    (
+        GenericPredicates::from_explicit_own_predicates(StoredEarlyBinder::bind(
+            Clauses::default().store(),
+        )),
+        None,
+    )
+}
+
 impl GenericPredicates {
     #[inline]
     pub(crate) fn from_explicit_own_predicates(
@@ -2590,11 +2606,13 @@ pub(crate) fn associated_type_by_name_including_super_traits<'db>(
 ) -> Option<(TraitRef<'db>, TypeAliasId)> {
     let module = trait_ref.def_id.0.module(db);
     let interner = DbInterner::new_with(db, module.krate(db));
-    rustc_type_ir::elaborate::supertraits(interner, Binder::dummy(trait_ref)).find_map(|t| {
-        let trait_id = t.as_ref().skip_binder().def_id.0;
-        let assoc_type = trait_id.trait_items(db).associated_type_by_name(name)?;
-        Some((t.skip_binder(), assoc_type))
-    })
+    all_supertraits_trait_refs(db, trait_ref.def_id.0)
+        .map(|t| t.instantiate(interner, trait_ref.args))
+        .find_map(|t| {
+            let trait_id = t.def_id.0;
+            let assoc_type = trait_id.trait_items(db).associated_type_by_name(name)?;
+            Some((t, assoc_type))
+        })
 }
 
 pub fn associated_type_shorthand_candidates(
@@ -2723,3 +2741,96 @@ fn named_associated_type_shorthand_candidates<'db, R>(
         _ => None,
     }
 }
+
+/// During lowering, elaborating supertraits can cause cycles. To avoid that, we have a separate query
+/// to only collect supertraits.
+///
+/// Technically, it is possible to avoid even more cycles by only collecting the `TraitId` of supertraits
+/// without their args. However rustc doesn't do that, so we don't either.
+pub(crate) fn all_supertraits_trait_refs(
+    db: &dyn HirDatabase,
+    trait_: TraitId,
+) -> impl ExactSizeIterator<Item = EarlyBinder<'_, TraitRef<'_>>> {
+    let interner = DbInterner::new_no_crate(db);
+    return all_supertraits_trait_refs_query(db, trait_).iter().map(move |trait_ref| {
+        trait_ref.get_with(|(trait_, args)| {
+            TraitRef::new_from_args(interner, (*trait_).into(), args.as_ref())
+        })
+    });
+
+    #[salsa_macros::tracked(returns(deref), cycle_result = all_supertraits_trait_refs_cycle_result)]
+    pub(crate) fn all_supertraits_trait_refs_query(
+        db: &dyn HirDatabase,
+        trait_: TraitId,
+    ) -> Box<[StoredEarlyBinder<(TraitId, StoredGenericArgs)>]> {
+        let resolver = trait_.resolver(db);
+        let signature = db.trait_signature(trait_);
+        let mut ctx = TyLoweringContext::new(
+            db,
+            &resolver,
+            &signature.store,
+            trait_.into(),
+            LifetimeElisionKind::AnonymousReportError,
+        );
+        let interner = ctx.interner;
+
+        let self_param_ty = Ty::new_param(
+            interner,
+            TypeParamId::from_unchecked(TypeOrConstParamId {
+                parent: trait_.into(),
+                local_id: Idx::from_raw(la_arena::RawIdx::from_u32(0)),
+            }),
+            0,
+        );
+
+        let mut supertraits = FxHashSet::default();
+        supertraits.insert(StoredEarlyBinder::bind((
+            trait_,
+            GenericArgs::identity_for_item(interner, trait_.into()).store(),
+        )));
+
+        for pred in signature.generic_params.where_predicates() {
+            let WherePredicate::TypeBound { target, bound } = pred else {
+                continue;
+            };
+            let target = &signature.store[*target];
+            if let TypeRef::TypeParam(param_id) = target
+                && param_id.local_id().into_raw().into_u32() == 0
+            {
+                // This is `Self`.
+            } else if let TypeRef::Path(path) = target
+                && path.is_self_type()
+            {
+                // Also `Self`.
+            } else {
+                // Not `Self`!
+                continue;
+            }
+
+            ctx.lower_type_bound(bound, self_param_ty, true).for_each(|(clause, _)| {
+                if let ClauseKind::Trait(trait_ref) = clause.kind().skip_binder() {
+                    supertraits.extend(
+                        all_supertraits_trait_refs(db, trait_ref.trait_ref.def_id.0).map(|t| {
+                            let trait_ref = t.instantiate(interner, trait_ref.trait_ref.args);
+                            StoredEarlyBinder::bind((trait_ref.def_id.0, trait_ref.args.store()))
+                        }),
+                    );
+                }
+            });
+        }
+
+        Box::from_iter(supertraits)
+    }
+
+    pub(crate) fn all_supertraits_trait_refs_cycle_result(
+        db: &dyn HirDatabase,
+        _: salsa::Id,
+        trait_: TraitId,
+    ) -> Box<[StoredEarlyBinder<(TraitId, StoredGenericArgs)>]> {
+        let interner = DbInterner::new_no_crate(db);
+        Box::new([StoredEarlyBinder::bind((
+            trait_,
+            GenericArgs::identity_for_item(interner, trait_.into()).store(),
+        ))])
+    }
+}
diff --git a/src/tools/rust-analyzer/crates/hir-ty/src/tests/coercion.rs b/src/tools/rust-analyzer/crates/hir-ty/src/tests/coercion.rs
index 36630ab587cd..438699b40983 100644
--- a/src/tools/rust-analyzer/crates/hir-ty/src/tests/coercion.rs
+++ b/src/tools/rust-analyzer/crates/hir-ty/src/tests/coercion.rs
@@ -608,7 +608,7 @@ trait Foo {}
 fn test(f: impl Foo, g: &(impl Foo + ?Sized)) {
     let _: &dyn Foo = &f;
     let _: &dyn Foo = g;
-                    //^ expected &'? (dyn Foo + 'static), got &'? impl Foo + ?Sized
+                    //^ expected &'? (dyn Foo + 'static), got &'? (impl Foo + ?Sized)
 }
         "#,
     );
diff --git a/src/tools/rust-analyzer/crates/hir-ty/src/tests/display_source_code.rs b/src/tools/rust-analyzer/crates/hir-ty/src/tests/display_source_code.rs
index dc3869930dcf..37da7fc87563 100644
--- a/src/tools/rust-analyzer/crates/hir-ty/src/tests/display_source_code.rs
+++ b/src/tools/rust-analyzer/crates/hir-ty/src/tests/display_source_code.rs
@@ -111,7 +111,7 @@ fn test(
     b;
   //^ impl Foo
     c;
-  //^ &impl Foo + ?Sized
+  //^ &(impl Foo + ?Sized)
     d;
   //^ S<impl Foo>
     ref_any;
@@ -192,7 +192,7 @@ fn test(
     b;
   //^ fn(impl Foo) -> impl Foo
     c;
-} //^ fn(&impl Foo + ?Sized) -> &impl Foo + ?Sized
+} //^ fn(&(impl Foo + ?Sized)) -> &(impl Foo + ?Sized)
 "#,
     );
 }
diff --git a/src/tools/rust-analyzer/crates/hir-ty/src/tests/regression.rs b/src/tools/rust-analyzer/crates/hir-ty/src/tests/regression.rs
index 4f1480c39366..3b5b4e4fa540 100644
--- a/src/tools/rust-analyzer/crates/hir-ty/src/tests/regression.rs
+++ b/src/tools/rust-analyzer/crates/hir-ty/src/tests/regression.rs
@@ -2363,6 +2363,7 @@ fn test() {
 }
 "#,
         expect![[r#"
+            46..49 'Foo': Foo<N>
             93..97 'self': Foo<N>
             108..125 '{     ...     }': usize
             118..119 'N': usize
@@ -2645,3 +2646,45 @@ fn bar(v: Self::Assoc) {
         "#,
     );
 }
+
+#[test]
+fn issue_21560() {
+    check_no_mismatches(
+        r#"
+mod bindings {
+    use super::*;
+    pub type HRESULT = i32;
+}
+use bindings::*;
+
+
+mod error {
+    use super::*;
+    pub fn nonzero_hresult(hr: HRESULT) -> crate::HRESULT {
+        hr
+    }
+}
+pub use error::*;
+
+mod hresult {
+    use super::*;
+    pub struct HRESULT(pub i32);
+}
+pub use hresult::HRESULT;
+
+        "#,
+    );
+}
+
+#[test]
+fn regression_21577() {
+    check_no_mismatches(
+        r#"
+pub trait FilterT<F: FilterT<F, V = Self::V> = Self> {
+    type V;
+
+    fn foo() {}
+}
+    "#,
+    );
+}
diff --git a/src/tools/rust-analyzer/crates/hir-ty/src/tests/simple.rs b/src/tools/rust-analyzer/crates/hir-ty/src/tests/simple.rs
index 98503452d348..7d4f04268af9 100644
--- a/src/tools/rust-analyzer/crates/hir-ty/src/tests/simple.rs
+++ b/src/tools/rust-analyzer/crates/hir-ty/src/tests/simple.rs
@@ -2152,10 +2152,11 @@ async fn main() {
     let z: core::ops::ControlFlow<(), _> = try { () };
     let w = const { 92 };
     let t = 'a: { 92 };
+    let u = try bikeshed core::ops::ControlFlow<(), _> { () };
 }
         "#,
         expect![[r#"
-            16..193 '{     ...2 }; }': ()
+            16..256 '{     ...) }; }': ()
             26..27 'x': i32
             30..43 'unsafe { 92 }': i32
             39..41 '92': i32
@@ -2176,6 +2177,13 @@ async fn main() {
             176..177 't': i32
             180..190 ''a: { 92 }': i32
             186..188 '92': i32
+            200..201 'u': ControlFlow<(), ()>
+            204..253 'try bi...{ () }': ControlFlow<(), ()>
+            204..253 'try bi...{ () }': fn from_output<ControlFlow<(), ()>>(<ControlFlow<(), ()> as Try>::Output) -> ControlFlow<(), ()>
+            204..253 'try bi...{ () }': ControlFlow<(), ()>
+            204..253 'try bi...{ () }': ControlFlow<(), ()>
+            204..253 'try bi...{ () }': ControlFlow<(), ()>
+            249..251 '()': ()
         "#]],
     )
 }
@@ -4056,3 +4064,13 @@ fn foo() {
         "#]],
     );
 }
+
+#[test]
+fn include_bytes_len_mismatch() {
+    check_no_mismatches(
+        r#"
+//- minicore: include_bytes
+static S: &[u8; 158] = include_bytes!("/foo/bar/baz.txt");
+    "#,
+    );
+}
diff --git a/src/tools/rust-analyzer/crates/hir-ty/src/tests/traits.rs b/src/tools/rust-analyzer/crates/hir-ty/src/tests/traits.rs
index 390553c0d7a9..cdf7b40003b5 100644
--- a/src/tools/rust-analyzer/crates/hir-ty/src/tests/traits.rs
+++ b/src/tools/rust-analyzer/crates/hir-ty/src/tests/traits.rs
@@ -219,14 +219,16 @@ fn test() {
 
 #[test]
 fn infer_try_block() {
-    // FIXME: We should test more cases, but it currently doesn't work, since
-    // our labeled block type inference is broken.
     check_types(
         r#"
-//- minicore: try, option
+//- minicore: try, option, result, from
 fn test() {
     let x: Option<_> = try { Some(2)?; };
       //^ Option<()>
+    let homogeneous = try { Ok::<(), u32>(())?; "hi" };
+      //^^^^^^^^^^^ Result<&'? str, u32>
+    let heterogeneous = try bikeshed Result<_, u64> { 1 };
+      //^^^^^^^^^^^^^ Result<i32, u64>
 }
 "#,
     );
@@ -4819,7 +4821,7 @@ fn allowed3(baz: impl Baz<Assoc = Qux<impl Foo>>) {}
             431..433 '{}': ()
             447..450 'baz': impl Baz<Assoc = impl Foo>
             480..482 '{}': ()
-            500..503 'baz': impl Baz<Assoc = &'a impl Foo + 'a>
+            500..503 'baz': impl Baz<Assoc = &'a (impl Foo + 'a)>
             544..546 '{}': ()
             560..563 'baz': impl Baz<Assoc = Qux<impl Foo>>
             598..600 '{}': ()
diff --git a/src/tools/rust-analyzer/crates/hir-ty/src/utils.rs b/src/tools/rust-analyzer/crates/hir-ty/src/utils.rs
index 7dd73f1e7aa0..148300deb875 100644
--- a/src/tools/rust-analyzer/crates/hir-ty/src/utils.rs
+++ b/src/tools/rust-analyzer/crates/hir-ty/src/utils.rs
@@ -22,6 +22,7 @@
     TargetFeatures,
     db::HirDatabase,
     layout::{Layout, TagEncoding},
+    lower::all_supertraits_trait_refs,
     mir::pad16,
 };
 
@@ -62,23 +63,13 @@ pub(crate) fn fn_traits(lang_items: &LangItems) -> impl Iterator<Item = TraitId>
 
 /// Returns an iterator over the whole super trait hierarchy (including the
 /// trait itself).
-pub fn all_super_traits(db: &dyn DefDatabase, trait_: TraitId) -> SmallVec<[TraitId; 4]> {
-    // we need to take care a bit here to avoid infinite loops in case of cycles
-    // (i.e. if we have `trait A: B; trait B: A;`)
-
-    let mut result = smallvec![trait_];
-    let mut i = 0;
-    while let Some(&t) = result.get(i) {
-        // yeah this is quadratic, but trait hierarchies should be flat
-        // enough that this doesn't matter
-        direct_super_traits_cb(db, t, |tt| {
-            if !result.contains(&tt) {
-                result.push(tt);
-            }
-        });
-        i += 1;
-    }
-    result
+pub fn all_super_traits(db: &dyn HirDatabase, trait_: TraitId) -> SmallVec<[TraitId; 4]> {
+    let mut supertraits = all_supertraits_trait_refs(db, trait_)
+        .map(|trait_ref| trait_ref.skip_binder().def_id.0)
+        .collect::<SmallVec<[_; _]>>();
+    supertraits.sort_unstable();
+    supertraits.dedup();
+    supertraits
 }
 
 fn direct_super_traits_cb(db: &dyn DefDatabase, trait_: TraitId, cb: impl FnMut(TraitId)) {
diff --git a/src/tools/rust-analyzer/crates/hir/src/display.rs b/src/tools/rust-analyzer/crates/hir/src/display.rs
index 1f9af564c359..b4440dfa1826 100644
--- a/src/tools/rust-analyzer/crates/hir/src/display.rs
+++ b/src/tools/rust-analyzer/crates/hir/src/display.rs
@@ -587,6 +587,7 @@ fn hir_fmt(&self, f: &mut HirFormatter<'_, 'db>) -> Result {
                         Either::Left(ty),
                         &predicates,
                         SizedByDefault::Sized { anchor: krate },
+                        false,
                     );
                 }
             },
@@ -614,6 +615,7 @@ fn hir_fmt(&self, f: &mut HirFormatter<'_, 'db>) -> Result {
                 Either::Left(ty),
                 &predicates,
                 default_sized,
+                false,
             )?;
         }
         Ok(())
diff --git a/src/tools/rust-analyzer/crates/hir/src/lib.rs b/src/tools/rust-analyzer/crates/hir/src/lib.rs
index 252d71fb80a4..4b615665167c 100644
--- a/src/tools/rust-analyzer/crates/hir/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/hir/src/lib.rs
@@ -4233,6 +4233,10 @@ pub fn module(self, db: &dyn HirDatabase) -> Module {
         self.parent(db).module(db)
     }
 
+    pub fn as_id(self) -> u32 {
+        self.binding_id.into_raw().into_u32()
+    }
+
     pub fn ty(self, db: &dyn HirDatabase) -> Type<'_> {
         let def = self.parent;
         let infer = InferenceResult::for_body(db, def);
diff --git a/src/tools/rust-analyzer/crates/hir/src/term_search/tactics.rs b/src/tools/rust-analyzer/crates/hir/src/term_search/tactics.rs
index 05a89e76529b..8622aa1378b3 100644
--- a/src/tools/rust-analyzer/crates/hir/src/term_search/tactics.rs
+++ b/src/tools/rust-analyzer/crates/hir/src/term_search/tactics.rs
@@ -18,7 +18,6 @@
 use itertools::Itertools;
 use rustc_hash::FxHashSet;
 use rustc_type_ir::inherent::Ty as _;
-use span::Edition;
 
 use crate::{
     Adt, AssocItem, GenericDef, GenericParam, HasAttrs, HasVisibility, Impl, ModuleDef, ScopeDef,
@@ -367,7 +366,11 @@ pub(super) fn free_function<'a, 'lt, 'db, DB: HirDatabase>(
                         let ret_ty = it.ret_type_with_args(db, generics.iter().cloned());
                         // Filter out private and unsafe functions
                         if !it.is_visible_from(db, module)
-                            || it.is_unsafe_to_call(db, None, Edition::CURRENT_FIXME)
+                            || it.is_unsafe_to_call(
+                                db,
+                                None,
+                                crate::Crate::from(ctx.scope.resolver().krate()).edition(db),
+                            )
                             || it.is_unstable(db)
                             || ctx.config.enable_borrowcheck && ret_ty.contains_reference(db)
                             || ret_ty.is_raw_ptr()
@@ -473,7 +476,11 @@ pub(super) fn impl_method<'a, 'lt, 'db, DB: HirDatabase>(
 
             // Filter out private and unsafe functions
             if !it.is_visible_from(db, module)
-                || it.is_unsafe_to_call(db, None, Edition::CURRENT_FIXME)
+                || it.is_unsafe_to_call(
+                    db,
+                    None,
+                    crate::Crate::from(ctx.scope.resolver().krate()).edition(db),
+                )
                 || it.is_unstable(db)
             {
                 return None;
@@ -667,7 +674,11 @@ pub(super) fn impl_static_method<'a, 'lt, 'db, DB: HirDatabase>(
 
             // Filter out private and unsafe functions
             if !it.is_visible_from(db, module)
-                || it.is_unsafe_to_call(db, None, Edition::CURRENT_FIXME)
+                || it.is_unsafe_to_call(
+                    db,
+                    None,
+                    crate::Crate::from(ctx.scope.resolver().krate()).edition(db),
+                )
                 || it.is_unstable(db)
             {
                 return None;
diff --git a/src/tools/rust-analyzer/crates/ide-assists/src/handlers/auto_import.rs b/src/tools/rust-analyzer/crates/ide-assists/src/handlers/auto_import.rs
index cc2bf8174941..2694910aa609 100644
--- a/src/tools/rust-analyzer/crates/ide-assists/src/handlers/auto_import.rs
+++ b/src/tools/rust-analyzer/crates/ide-assists/src/handlers/auto_import.rs
@@ -155,6 +155,7 @@ pub(crate) fn auto_import(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<
                             &scope,
                             mod_path_to_ast(&import_path, edition),
                             &ctx.config.insert_use,
+                            edition,
                         );
                     },
                 );
diff --git a/src/tools/rust-analyzer/crates/ide-assists/src/handlers/convert_closure_to_fn.rs b/src/tools/rust-analyzer/crates/ide-assists/src/handlers/convert_closure_to_fn.rs
index ca142332d97e..5a223e11301c 100644
--- a/src/tools/rust-analyzer/crates/ide-assists/src/handlers/convert_closure_to_fn.rs
+++ b/src/tools/rust-analyzer/crates/ide-assists/src/handlers/convert_closure_to_fn.rs
@@ -132,7 +132,7 @@ pub(crate) fn convert_closure_to_fn(acc: &mut Assists, ctx: &AssistContext<'_>)
             );
         }
 
-        if block.try_token().is_none()
+        if block.try_block_modifier().is_none()
             && block.unsafe_token().is_none()
             && block.label().is_none()
             && block.const_token().is_none()
diff --git a/src/tools/rust-analyzer/crates/ide-assists/src/handlers/extract_function.rs b/src/tools/rust-analyzer/crates/ide-assists/src/handlers/extract_function.rs
index f2363c6f7ba2..124ef509fb89 100644
--- a/src/tools/rust-analyzer/crates/ide-assists/src/handlers/extract_function.rs
+++ b/src/tools/rust-analyzer/crates/ide-assists/src/handlers/extract_function.rs
@@ -859,7 +859,7 @@ fn analyze_container<'db>(
                     ast::BlockExpr(block_expr) => {
                         let (constness, block) = match block_expr.modifier() {
                             Some(ast::BlockModifier::Const(_)) => (true, block_expr),
-                            Some(ast::BlockModifier::Try(_)) => (false, block_expr),
+                            Some(ast::BlockModifier::Try { .. }) => (false, block_expr),
                             Some(ast::BlockModifier::Label(label)) if label.lifetime().is_some() => (false, block_expr),
                             _ => continue,
                         };
diff --git a/src/tools/rust-analyzer/crates/ide-assists/src/handlers/generate_function.rs b/src/tools/rust-analyzer/crates/ide-assists/src/handlers/generate_function.rs
index bd66c02b4150..ded3b0f5acb2 100644
--- a/src/tools/rust-analyzer/crates/ide-assists/src/handlers/generate_function.rs
+++ b/src/tools/rust-analyzer/crates/ide-assists/src/handlers/generate_function.rs
@@ -1147,14 +1147,7 @@ fn maybe_displayed_type(
         if ty.is_reference() || ty.is_mutable_reference() {
             let famous_defs = &FamousDefs(&ctx.sema, ctx.sema.scope(fn_arg.syntax())?.krate());
             convert_reference_type(ty.strip_references(), ctx.db(), famous_defs)
-                .map(|conversion| {
-                    conversion
-                        .convert_type(
-                            ctx.db(),
-                            target_module.krate(ctx.db()).to_display_target(ctx.db()),
-                        )
-                        .to_string()
-                })
+                .map(|conversion| conversion.convert_type(ctx.db(), target_module).to_string())
                 .or_else(|| ty.display_source_code(ctx.db(), target_module.into(), true).ok())
         } else {
             ty.display_source_code(ctx.db(), target_module.into(), true).ok()
@@ -3187,6 +3180,28 @@ fn main() {
             r#"
 fn main() {
     s.self$0();
+}
+        "#,
+        );
+    }
+
+    #[test]
+    fn regression_21288() {
+        check_assist(
+            generate_function,
+            r#"
+//- minicore: copy
+fn foo() {
+    $0bar(&|x| true)
+}
+        "#,
+            r#"
+fn foo() {
+    bar(&|x| true)
+}
+
+fn bar(arg: impl Fn(_) -> bool) {
+    ${0:todo!()}
 }
         "#,
         );
diff --git a/src/tools/rust-analyzer/crates/ide-assists/src/handlers/generate_getter_or_setter.rs b/src/tools/rust-analyzer/crates/ide-assists/src/handlers/generate_getter_or_setter.rs
index e42d0ed1b00b..73e93a3fbf52 100644
--- a/src/tools/rust-analyzer/crates/ide-assists/src/handlers/generate_getter_or_setter.rs
+++ b/src/tools/rust-analyzer/crates/ide-assists/src/handlers/generate_getter_or_setter.rs
@@ -226,15 +226,15 @@ fn generate_getter_from_info(
         )
     } else {
         (|| {
-            let krate = ctx.sema.scope(record_field_info.field_ty.syntax())?.krate();
-            let famous_defs = &FamousDefs(&ctx.sema, krate);
+            let module = ctx.sema.scope(record_field_info.field_ty.syntax())?.module();
+            let famous_defs = &FamousDefs(&ctx.sema, module.krate(ctx.db()));
             ctx.sema
                 .resolve_type(&record_field_info.field_ty)
                 .and_then(|ty| convert_reference_type(ty, ctx.db(), famous_defs))
                 .map(|conversion| {
                     cov_mark::hit!(convert_reference_type);
                     (
-                        conversion.convert_type(ctx.db(), krate.to_display_target(ctx.db())),
+                        conversion.convert_type(ctx.db(), module),
                         conversion.getter(record_field_info.field_name.to_string()),
                     )
                 })
diff --git a/src/tools/rust-analyzer/crates/ide-assists/src/handlers/move_guard.rs b/src/tools/rust-analyzer/crates/ide-assists/src/handlers/move_guard.rs
index 84f02bdfdba6..fdc5a0fbda35 100644
--- a/src/tools/rust-analyzer/crates/ide-assists/src/handlers/move_guard.rs
+++ b/src/tools/rust-analyzer/crates/ide-assists/src/handlers/move_guard.rs
@@ -1,6 +1,7 @@
-use itertools::Itertools;
+use itertools::{Itertools, chain};
 use syntax::{
     SyntaxKind::WHITESPACE,
+    TextRange,
     ast::{
         AstNode, BlockExpr, ElseBranch, Expr, IfExpr, MatchArm, Pat, edit::AstNodeEdit, make,
         prec::ExprPrecedence, syntax_factory::SyntaxFactory,
@@ -44,13 +45,26 @@ pub(crate) fn move_guard_to_arm_body(acc: &mut Assists, ctx: &AssistContext<'_>)
         cov_mark::hit!(move_guard_inapplicable_in_arm_body);
         return None;
     }
-    let space_before_guard = guard.syntax().prev_sibling_or_token();
+    let rest_arms = rest_arms(&match_arm, ctx.selection_trimmed())?;
+    let space_before_delete = chain(
+        guard.syntax().prev_sibling_or_token(),
+        rest_arms.iter().filter_map(|it| it.syntax().prev_sibling_or_token()),
+    );
     let space_after_arrow = match_arm.fat_arrow_token()?.next_sibling_or_token();
 
-    let guard_condition = guard.condition()?.reset_indent();
     let arm_expr = match_arm.expr()?;
-    let then_branch = crate::utils::wrap_block(&arm_expr);
-    let if_expr = make::expr_if(guard_condition, then_branch, None).indent(arm_expr.indent_level());
+    let if_branch = chain([&match_arm], &rest_arms)
+        .rfold(None, |else_branch, arm| {
+            if let Some(guard) = arm.guard() {
+                let then_branch = crate::utils::wrap_block(&arm.expr()?);
+                let guard_condition = guard.condition()?.reset_indent();
+                Some(make::expr_if(guard_condition, then_branch, else_branch).into())
+            } else {
+                arm.expr().map(|it| crate::utils::wrap_block(&it).into())
+            }
+        })?
+        .indent(arm_expr.indent_level());
+    let ElseBranch::IfExpr(if_expr) = if_branch else { return None };
 
     let target = guard.syntax().text_range();
     acc.add(
@@ -59,10 +73,13 @@ pub(crate) fn move_guard_to_arm_body(acc: &mut Assists, ctx: &AssistContext<'_>)
         target,
         |builder| {
             let mut edit = builder.make_editor(match_arm.syntax());
-            if let Some(element) = space_before_guard
-                && element.kind() == WHITESPACE
-            {
-                edit.delete(element);
+            for element in space_before_delete {
+                if element.kind() == WHITESPACE {
+                    edit.delete(element);
+                }
+            }
+            for rest_arm in &rest_arms {
+                edit.delete(rest_arm.syntax());
             }
             if let Some(element) = space_after_arrow
                 && element.kind() == WHITESPACE
@@ -221,6 +238,25 @@ pub(crate) fn move_arm_cond_to_match_guard(
     )
 }
 
+fn rest_arms(match_arm: &MatchArm, selection: TextRange) -> Option<Vec<MatchArm>> {
+    match_arm
+        .parent_match()
+        .match_arm_list()?
+        .arms()
+        .skip_while(|it| it != match_arm)
+        .skip(1)
+        .take_while(move |it| {
+            selection.is_empty() || crate::utils::is_selected(it, selection, false)
+        })
+        .take_while(move |it| {
+            it.pat()
+                .zip(match_arm.pat())
+                .is_some_and(|(a, b)| a.syntax().text() == b.syntax().text())
+        })
+        .collect::<Vec<_>>()
+        .into()
+}
+
 // Parses an if-else-if chain to get the conditions and the then branches until we encounter an else
 // branch or the end.
 fn parse_if_chain(if_expr: IfExpr) -> Option<(Vec<(Expr, BlockExpr)>, Option<BlockExpr>)> {
@@ -344,6 +380,115 @@ fn main() {
         );
     }
 
+    #[test]
+    fn move_multiple_guard_to_arm_body_works() {
+        check_assist(
+            move_guard_to_arm_body,
+            r#"
+fn main() {
+    match 92 {
+        x @ 0..30 $0if x % 3 == 0 => false,
+        x @ 0..30 if x % 2 == 0 => true,
+        _ => false
+    }
+}
+"#,
+            r#"
+fn main() {
+    match 92 {
+        x @ 0..30 => if x % 3 == 0 {
+            false
+        } else if x % 2 == 0 {
+            true
+        },
+        _ => false
+    }
+}
+"#,
+        );
+
+        check_assist(
+            move_guard_to_arm_body,
+            r#"
+fn main() {
+    match 92 {
+        x @ 0..30 $0if x % 3 == 0 => false,
+        x @ 0..30 if x % 2 == 0 => true,
+        x @ 0..30 => false,
+        _ => true
+    }
+}
+"#,
+            r#"
+fn main() {
+    match 92 {
+        x @ 0..30 => if x % 3 == 0 {
+            false
+        } else if x % 2 == 0 {
+            true
+        } else {
+            false
+        },
+        _ => true
+    }
+}
+"#,
+        );
+
+        check_assist(
+            move_guard_to_arm_body,
+            r#"
+fn main() {
+    match 92 {
+        x @ 0..30 if x % 3 == 0 => false,
+        x @ 0..30 $0if x % 2 == 0$0 => true,
+        x @ 0..30 => false,
+        _ => true
+    }
+}
+"#,
+            r#"
+fn main() {
+    match 92 {
+        x @ 0..30 if x % 3 == 0 => false,
+        x @ 0..30 => if x % 2 == 0 {
+            true
+        },
+        x @ 0..30 => false,
+        _ => true
+    }
+}
+"#,
+        );
+
+        check_assist(
+            move_guard_to_arm_body,
+            r#"
+fn main() {
+    match 92 {
+        x @ 0..30 $0if x % 3 == 0 => false,
+        x @ 0..30 $0if x % 2 == 0 => true,
+        x @ 0..30 => false,
+        _ => true
+    }
+}
+"#,
+            r#"
+fn main() {
+    match 92 {
+        x @ 0..30 => if x % 3 == 0 {
+            false
+        } else if x % 2 == 0 {
+            true
+        },
+        x @ 0..30 => false,
+        _ => true
+    }
+}
+"#,
+        );
+    }
+
     #[test]
     fn move_guard_to_block_arm_body_works() {
         check_assist(
diff --git a/src/tools/rust-analyzer/crates/ide-assists/src/utils.rs b/src/tools/rust-analyzer/crates/ide-assists/src/utils.rs
index 4b8c19305793..5e08cba8e293 100644
--- a/src/tools/rust-analyzer/crates/ide-assists/src/utils.rs
+++ b/src/tools/rust-analyzer/crates/ide-assists/src/utils.rs
@@ -4,8 +4,7 @@
 
 pub(crate) use gen_trait_fn_body::gen_trait_fn_body;
 use hir::{
-    DisplayTarget, HasAttrs as HirHasAttrs, HirDisplay, InFile, ModuleDef, PathResolution,
-    Semantics,
+    HasAttrs as HirHasAttrs, HirDisplay, InFile, ModuleDef, PathResolution, Semantics,
     db::{ExpandDatabase, HirDatabase},
 };
 use ide_db::{
@@ -836,13 +835,12 @@ enum ReferenceConversionType {
 }
 
 impl<'db> ReferenceConversion<'db> {
-    pub(crate) fn convert_type(
-        &self,
-        db: &'db dyn HirDatabase,
-        display_target: DisplayTarget,
-    ) -> ast::Type {
+    pub(crate) fn convert_type(&self, db: &'db dyn HirDatabase, module: hir::Module) -> ast::Type {
         let ty = match self.conversion {
-            ReferenceConversionType::Copy => self.ty.display(db, display_target).to_string(),
+            ReferenceConversionType::Copy => self
+                .ty
+                .display_source_code(db, module.into(), true)
+                .unwrap_or_else(|_| "_".to_owned()),
             ReferenceConversionType::AsRefStr => "&str".to_owned(),
             ReferenceConversionType::AsRefSlice => {
                 let type_argument_name = self
@@ -850,8 +848,8 @@ pub(crate) fn convert_type(
                     .type_arguments()
                     .next()
                     .unwrap()
-                    .display(db, display_target)
-                    .to_string();
+                    .display_source_code(db, module.into(), true)
+                    .unwrap_or_else(|_| "_".to_owned());
                 format!("&[{type_argument_name}]")
             }
             ReferenceConversionType::Dereferenced => {
@@ -860,8 +858,8 @@ pub(crate) fn convert_type(
                     .type_arguments()
                     .next()
                     .unwrap()
-                    .display(db, display_target)
-                    .to_string();
+                    .display_source_code(db, module.into(), true)
+                    .unwrap_or_else(|_| "_".to_owned());
                 format!("&{type_argument_name}")
             }
             ReferenceConversionType::Option => {
@@ -870,16 +868,22 @@ pub(crate) fn convert_type(
                     .type_arguments()
                     .next()
                     .unwrap()
-                    .display(db, display_target)
-                    .to_string();
+                    .display_source_code(db, module.into(), true)
+                    .unwrap_or_else(|_| "_".to_owned());
                 format!("Option<&{type_argument_name}>")
             }
             ReferenceConversionType::Result => {
                 let mut type_arguments = self.ty.type_arguments();
-                let first_type_argument_name =
-                    type_arguments.next().unwrap().display(db, display_target).to_string();
-                let second_type_argument_name =
-                    type_arguments.next().unwrap().display(db, display_target).to_string();
+                let first_type_argument_name = type_arguments
+                    .next()
+                    .unwrap()
+                    .display_source_code(db, module.into(), true)
+                    .unwrap_or_else(|_| "_".to_owned());
+                let second_type_argument_name = type_arguments
+                    .next()
+                    .unwrap()
+                    .display_source_code(db, module.into(), true)
+                    .unwrap_or_else(|_| "_".to_owned());
                 format!("Result<&{first_type_argument_name}, &{second_type_argument_name}>")
             }
         };
diff --git a/src/tools/rust-analyzer/crates/ide-completion/src/completions/postfix.rs b/src/tools/rust-analyzer/crates/ide-completion/src/completions/postfix.rs
index 7f67ef848ece..cffc44f8afb3 100644
--- a/src/tools/rust-analyzer/crates/ide-completion/src/completions/postfix.rs
+++ b/src/tools/rust-analyzer/crates/ide-completion/src/completions/postfix.rs
@@ -151,6 +151,10 @@ pub(crate) fn complete_postfix(
                     .add_to(acc, ctx.db);
                 }
             },
+            _ if is_in_cond => {
+                postfix_snippet("let", "let", &format!("let $1 = {receiver_text}"))
+                    .add_to(acc, ctx.db);
+            }
             _ if matches!(second_ancestor.kind(), STMT_LIST | EXPR_STMT) => {
                 postfix_snippet("let", "let", &format!("let $0 = {receiver_text};"))
                     .add_to(acc, ctx.db);
@@ -253,7 +257,6 @@ pub(crate) fn complete_postfix(
                 &format!("while {receiver_text} {{\n    $0\n}}"),
             )
             .add_to(acc, ctx.db);
-            postfix_snippet("not", "!expr", &format!("!{receiver_text}")).add_to(acc, ctx.db);
         } else if let Some(trait_) = ctx.famous_defs().core_iter_IntoIterator()
             && receiver_ty.impls_trait(ctx.db, trait_, &[])
         {
@@ -266,6 +269,10 @@ pub(crate) fn complete_postfix(
         }
     }
 
+    if receiver_ty.is_bool() || receiver_ty.is_unknown() {
+        postfix_snippet("not", "!expr", &format!("!{receiver_text}")).add_to(acc, ctx.db);
+    }
+
     let block_should_be_wrapped = if let ast::Expr::BlockExpr(block) = dot_receiver {
         block.modifier().is_some() || !block.is_standalone()
     } else {
@@ -585,6 +592,31 @@ fn main() {
         );
     }
 
+    #[test]
+    fn postfix_completion_works_in_if_condition() {
+        check(
+            r#"
+fn foo(cond: bool) {
+    if cond.$0
+}
+"#,
+            expect![[r#"
+                sn box  Box::new(expr)
+                sn call function(expr)
+                sn const      const {}
+                sn dbg      dbg!(expr)
+                sn dbgr    dbg!(&expr)
+                sn deref         *expr
+                sn let             let
+                sn not           !expr
+                sn ref           &expr
+                sn refm      &mut expr
+                sn return  return expr
+                sn unsafe    unsafe {}
+            "#]],
+        );
+    }
+
     #[test]
     fn postfix_type_filtering() {
         check(
@@ -744,6 +776,25 @@ fn main() {
         );
     }
 
+    #[test]
+    fn iflet_fallback_cond() {
+        check_edit(
+            "let",
+            r#"
+fn main() {
+    let bar = 2;
+    if bar.$0
+}
+"#,
+            r#"
+fn main() {
+    let bar = 2;
+    if let $1 = bar
+}
+"#,
+        );
+    }
+
     #[test]
     fn option_letelse() {
         check_edit(
diff --git a/src/tools/rust-analyzer/crates/ide-db/src/imports/insert_use.rs b/src/tools/rust-analyzer/crates/ide-db/src/imports/insert_use.rs
index 4444ef5d81d5..db1d599d550d 100644
--- a/src/tools/rust-analyzer/crates/ide-db/src/imports/insert_use.rs
+++ b/src/tools/rust-analyzer/crates/ide-db/src/imports/insert_use.rs
@@ -146,9 +146,14 @@ pub fn insert_use(scope: &ImportScope, path: ast::Path, cfg: &InsertUseConfig) {
     insert_use_with_alias_option(scope, path, cfg, None);
 }
 
-pub fn insert_use_as_alias(scope: &ImportScope, path: ast::Path, cfg: &InsertUseConfig) {
+pub fn insert_use_as_alias(
+    scope: &ImportScope,
+    path: ast::Path,
+    cfg: &InsertUseConfig,
+    edition: span::Edition,
+) {
     let text: &str = "use foo as _";
-    let parse = syntax::SourceFile::parse(text, span::Edition::CURRENT_FIXME);
+    let parse = syntax::SourceFile::parse(text, edition);
     let node = parse
         .tree()
         .syntax()
diff --git a/src/tools/rust-analyzer/crates/ide-db/src/syntax_helpers/node_ext.rs b/src/tools/rust-analyzer/crates/ide-db/src/syntax_helpers/node_ext.rs
index 94ecf6a02ddc..e30b21c139fa 100644
--- a/src/tools/rust-analyzer/crates/ide-db/src/syntax_helpers/node_ext.rs
+++ b/src/tools/rust-analyzer/crates/ide-db/src/syntax_helpers/node_ext.rs
@@ -49,7 +49,7 @@ pub fn is_closure_or_blk_with_modif(expr: &ast::Expr) -> bool {
                 block_expr.modifier(),
                 Some(
                     ast::BlockModifier::Async(_)
-                        | ast::BlockModifier::Try(_)
+                        | ast::BlockModifier::Try { .. }
                         | ast::BlockModifier::Const(_)
                 )
             )
@@ -148,7 +148,7 @@ pub fn walk_patterns_in_expr(start: &ast::Expr, cb: &mut dyn FnMut(ast::Pat)) {
                                 block_expr.modifier(),
                                 Some(
                                     ast::BlockModifier::Async(_)
-                                        | ast::BlockModifier::Try(_)
+                                        | ast::BlockModifier::Try { .. }
                                         | ast::BlockModifier::Const(_)
                                 )
                             )
@@ -291,7 +291,7 @@ pub fn for_each_tail_expr(expr: &ast::Expr, cb: &mut dyn FnMut(&ast::Expr)) {
             match b.modifier() {
                 Some(
                     ast::BlockModifier::Async(_)
-                    | ast::BlockModifier::Try(_)
+                    | ast::BlockModifier::Try { .. }
                     | ast::BlockModifier::Const(_),
                 ) => return cb(expr),
 
diff --git a/src/tools/rust-analyzer/crates/ide-db/src/syntax_helpers/suggest_name.rs b/src/tools/rust-analyzer/crates/ide-db/src/syntax_helpers/suggest_name.rs
index b8b9a7a76816..5d1e876ea298 100644
--- a/src/tools/rust-analyzer/crates/ide-db/src/syntax_helpers/suggest_name.rs
+++ b/src/tools/rust-analyzer/crates/ide-db/src/syntax_helpers/suggest_name.rs
@@ -206,17 +206,18 @@ pub fn try_for_variable(
         expr: &ast::Expr,
         sema: &Semantics<'_, RootDatabase>,
     ) -> Option<SmolStr> {
+        let edition = sema.scope(expr.syntax())?.krate().edition(sema.db);
         // `from_param` does not benefit from stripping it need the largest
         // context possible so we check firstmost
-        if let Some(name) = from_param(expr, sema) {
+        if let Some(name) = from_param(expr, sema, edition) {
             return Some(self.suggest_name(&name));
         }
 
         let mut next_expr = Some(expr.clone());
         while let Some(expr) = next_expr {
-            let name = from_call(&expr)
-                .or_else(|| from_type(&expr, sema))
-                .or_else(|| from_field_name(&expr));
+            let name = from_call(&expr, edition)
+                .or_else(|| from_type(&expr, sema, edition))
+                .or_else(|| from_field_name(&expr, edition));
             if let Some(name) = name {
                 return Some(self.suggest_name(&name));
             }
@@ -270,7 +271,7 @@ fn split_numeric_suffix(name: &str) -> (&str, Option<usize>) {
     }
 }
 
-fn normalize(name: &str) -> Option<SmolStr> {
+fn normalize(name: &str, edition: syntax::Edition) -> Option<SmolStr> {
     let name = to_lower_snake_case(name).to_smolstr();
 
     if USELESS_NAMES.contains(&name.as_str()) {
@@ -281,16 +282,16 @@ fn normalize(name: &str) -> Option<SmolStr> {
         return None;
     }
 
-    if !is_valid_name(&name) {
+    if !is_valid_name(&name, edition) {
         return None;
     }
 
     Some(name)
 }
 
-fn is_valid_name(name: &str) -> bool {
+fn is_valid_name(name: &str, edition: syntax::Edition) -> bool {
     matches!(
-        super::LexedStr::single_token(syntax::Edition::CURRENT_FIXME, name),
+        super::LexedStr::single_token(edition, name),
         Some((syntax::SyntaxKind::IDENT, _error))
     )
 }
@@ -304,11 +305,11 @@ fn is_useless_method(method: &ast::MethodCallExpr) -> bool {
     }
 }
 
-fn from_call(expr: &ast::Expr) -> Option<SmolStr> {
-    from_func_call(expr).or_else(|| from_method_call(expr))
+fn from_call(expr: &ast::Expr, edition: syntax::Edition) -> Option<SmolStr> {
+    from_func_call(expr, edition).or_else(|| from_method_call(expr, edition))
 }
 
-fn from_func_call(expr: &ast::Expr) -> Option<SmolStr> {
+fn from_func_call(expr: &ast::Expr, edition: syntax::Edition) -> Option<SmolStr> {
     let call = match expr {
         ast::Expr::CallExpr(call) => call,
         _ => return None,
@@ -318,10 +319,10 @@ fn from_func_call(expr: &ast::Expr) -> Option<SmolStr> {
         _ => return None,
     };
     let ident = func.path()?.segment()?.name_ref()?.ident_token()?;
-    normalize(ident.text())
+    normalize(ident.text(), edition)
 }
 
-fn from_method_call(expr: &ast::Expr) -> Option<SmolStr> {
+fn from_method_call(expr: &ast::Expr, edition: syntax::Edition) -> Option<SmolStr> {
     let method = match expr {
         ast::Expr::MethodCallExpr(call) => call,
         _ => return None,
@@ -340,10 +341,14 @@ fn from_method_call(expr: &ast::Expr) -> Option<SmolStr> {
         }
     }
 
-    normalize(name)
+    normalize(name, edition)
 }
 
-fn from_param(expr: &ast::Expr, sema: &Semantics<'_, RootDatabase>) -> Option<SmolStr> {
+fn from_param(
+    expr: &ast::Expr,
+    sema: &Semantics<'_, RootDatabase>,
+    edition: Edition,
+) -> Option<SmolStr> {
     let arg_list = expr.syntax().parent().and_then(ast::ArgList::cast)?;
     let args_parent = arg_list.syntax().parent()?;
     let func = match_ast! {
@@ -362,7 +367,7 @@ fn from_param(expr: &ast::Expr, sema: &Semantics<'_, RootDatabase>) -> Option<Sm
     let param = func.params().into_iter().nth(idx)?;
     let pat = sema.source(param)?.value.right()?.pat()?;
     let name = var_name_from_pat(&pat)?;
-    normalize(&name.to_smolstr())
+    normalize(&name.to_smolstr(), edition)
 }
 
 fn var_name_from_pat(pat: &ast::Pat) -> Option<ast::Name> {
@@ -374,10 +379,13 @@ fn var_name_from_pat(pat: &ast::Pat) -> Option<ast::Name> {
     }
 }
 
-fn from_type(expr: &ast::Expr, sema: &Semantics<'_, RootDatabase>) -> Option<SmolStr> {
+fn from_type(
+    expr: &ast::Expr,
+    sema: &Semantics<'_, RootDatabase>,
+    edition: Edition,
+) -> Option<SmolStr> {
     let ty = sema.type_of_expr(expr)?.adjusted();
     let ty = ty.remove_ref().unwrap_or(ty);
-    let edition = sema.scope(expr.syntax())?.krate().edition(sema.db);
 
     name_of_type(&ty, sema.db, edition)
 }
@@ -417,7 +425,7 @@ fn name_of_type<'db>(
     } else {
         return None;
     };
-    normalize(&name)
+    normalize(&name, edition)
 }
 
 fn sequence_name<'db>(
@@ -450,13 +458,13 @@ fn trait_name(trait_: &hir::Trait, db: &RootDatabase, edition: Edition) -> Optio
     Some(name)
 }
 
-fn from_field_name(expr: &ast::Expr) -> Option<SmolStr> {
+fn from_field_name(expr: &ast::Expr, edition: syntax::Edition) -> Option<SmolStr> {
     let field = match expr {
         ast::Expr::FieldExpr(field) => field,
         _ => return None,
     };
     let ident = field.name_ref()?.ident_token()?;
-    normalize(ident.text())
+    normalize(ident.text(), edition)
 }
 
 #[cfg(test)]
diff --git a/src/tools/rust-analyzer/crates/ide/src/goto_definition.rs b/src/tools/rust-analyzer/crates/ide/src/goto_definition.rs
index c0a74380810b..3c3ac9d3bbe6 100644
--- a/src/tools/rust-analyzer/crates/ide/src/goto_definition.rs
+++ b/src/tools/rust-analyzer/crates/ide/src/goto_definition.rs
@@ -332,7 +332,7 @@ pub(crate) fn find_fn_or_blocks(
                     ast::BlockExpr(blk) => {
                         match blk.modifier() {
                             Some(ast::BlockModifier::Async(_)) => blk.syntax().clone(),
-                            Some(ast::BlockModifier::Try(_)) if token_kind != T![return] => blk.syntax().clone(),
+                            Some(ast::BlockModifier::Try { .. }) if token_kind != T![return] => blk.syntax().clone(),
                             _ => continue,
                         }
                     },
@@ -404,8 +404,8 @@ fn nav_for_exit_points(
                                 let blk_in_file = InFile::new(file_id, blk.into());
                                 Some(expr_to_nav(db, blk_in_file, Some(async_tok)))
                             },
-                            Some(ast::BlockModifier::Try(_)) if token_kind != T![return] => {
-                                let try_tok = blk.try_token()?.text_range();
+                            Some(ast::BlockModifier::Try { .. }) if token_kind != T![return] => {
+                                let try_tok = blk.try_block_modifier()?.try_token()?.text_range();
                                 let blk_in_file = InFile::new(file_id, blk.into());
                                 Some(expr_to_nav(db, blk_in_file, Some(try_tok)))
                             },
diff --git a/src/tools/rust-analyzer/crates/ide/src/highlight_related.rs b/src/tools/rust-analyzer/crates/ide/src/highlight_related.rs
index fce033382b4b..c8e01e21ec9c 100644
--- a/src/tools/rust-analyzer/crates/ide/src/highlight_related.rs
+++ b/src/tools/rust-analyzer/crates/ide/src/highlight_related.rs
@@ -473,7 +473,7 @@ pub(crate) fn highlight_exit_points(
                 },
                 ast::BlockExpr(blk) => match blk.modifier() {
                     Some(ast::BlockModifier::Async(t)) => hl_exit_points(sema, Some(t), blk.into()),
-                    Some(ast::BlockModifier::Try(t)) if token.kind() != T![return] => {
+                    Some(ast::BlockModifier::Try { try_token: t, .. }) if token.kind() != T![return] => {
                         hl_exit_points(sema, Some(t), blk.into())
                     },
                     _ => continue,
diff --git a/src/tools/rust-analyzer/crates/ide/src/hover/render.rs b/src/tools/rust-analyzer/crates/ide/src/hover/render.rs
index 15ea92d1c6ec..cf5f137cdd03 100644
--- a/src/tools/rust-analyzer/crates/ide/src/hover/render.rs
+++ b/src/tools/rust-analyzer/crates/ide/src/hover/render.rs
@@ -74,7 +74,7 @@ pub(super) fn try_expr(
                 ast::Fn(fn_) => sema.to_def(&fn_)?.ret_type(sema.db),
                 ast::Item(__) => return None,
                 ast::ClosureExpr(closure) => sema.type_of_expr(&closure.body()?)?.original,
-                ast::BlockExpr(block_expr) => if matches!(block_expr.modifier(), Some(ast::BlockModifier::Async(_) | ast::BlockModifier::Try(_)| ast::BlockModifier::Const(_))) {
+                ast::BlockExpr(block_expr) => if matches!(block_expr.modifier(), Some(ast::BlockModifier::Async(_) | ast::BlockModifier::Try { .. } | ast::BlockModifier::Const(_))) {
                     sema.type_of_expr(&block_expr.into())?.original
                 } else {
                     continue;
diff --git a/src/tools/rust-analyzer/crates/ide/src/inlay_hints/bind_pat.rs b/src/tools/rust-analyzer/crates/ide/src/inlay_hints/bind_pat.rs
index c74e3104c14e..caf7cc714d33 100644
--- a/src/tools/rust-analyzer/crates/ide/src/inlay_hints/bind_pat.rs
+++ b/src/tools/rust-analyzer/crates/ide/src/inlay_hints/bind_pat.rs
@@ -1382,4 +1382,21 @@ fn f<'a>() {
             "#]],
         );
     }
+
+    #[test]
+    fn ref_multi_trait_impl_trait() {
+        check_with_config(
+            InlayHintsConfig { type_hints: true, ..DISABLED_CONFIG },
+            r#"
+//- minicore: sized
+trait Eq {}
+trait Ord {}
+
+fn foo(argument: &(impl Eq + Ord)) {
+    let x = argument;
+     // ^ &(impl Eq + Ord)
+}
+        "#,
+        );
+    }
 }
diff --git a/src/tools/rust-analyzer/crates/ide/src/lib.rs b/src/tools/rust-analyzer/crates/ide/src/lib.rs
index 930eaf2262d9..2e618550f92f 100644
--- a/src/tools/rust-analyzer/crates/ide/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/ide/src/lib.rs
@@ -67,7 +67,7 @@
     FxHashMap, FxIndexSet, LineIndexDatabase,
     base_db::{
         CrateOrigin, CrateWorkspaceData, Env, FileSet, RootQueryDb, SourceDatabase, VfsPath,
-        salsa::{Cancelled, Database},
+        salsa::{CancellationToken, Cancelled, Database},
     },
     prime_caches, symbol_index,
 };
@@ -947,6 +947,10 @@ fn with_db<F, T>(&self, f: F) -> Cancellable<T>
         // We use `attach_db_allow_change()` and not `attach_db()` because fixture injection can change the database.
         hir::attach_db_allow_change(&self.db, || Cancelled::catch(|| f(&self.db)))
     }
+
+    pub fn cancellation_token(&self) -> CancellationToken {
+        self.db.cancellation_token()
+    }
 }
 
 #[test]
diff --git a/src/tools/rust-analyzer/crates/ide/src/signature_help.rs b/src/tools/rust-analyzer/crates/ide/src/signature_help.rs
index 9ab07565e9ef..f86974b4ec76 100644
--- a/src/tools/rust-analyzer/crates/ide/src/signature_help.rs
+++ b/src/tools/rust-analyzer/crates/ide/src/signature_help.rs
@@ -1975,8 +1975,8 @@ trait Sub: Super + Super {
 fn f() -> impl Sub<$0
             "#,
             expect![[r#"
-                trait Sub<SubTy = …, SuperTy = …>
-                          ^^^^^^^^^  -----------
+                trait Sub<SuperTy = …, SubTy = …>
+                          ^^^^^^^^^^^  ---------
             "#]],
         );
     }
diff --git a/src/tools/rust-analyzer/crates/ide/src/syntax_highlighting.rs b/src/tools/rust-analyzer/crates/ide/src/syntax_highlighting.rs
index e64fd6488f2a..ce1df6a1e7dc 100644
--- a/src/tools/rust-analyzer/crates/ide/src/syntax_highlighting.rs
+++ b/src/tools/rust-analyzer/crates/ide/src/syntax_highlighting.rs
@@ -14,7 +14,7 @@
 use std::ops::ControlFlow;
 
 use either::Either;
-use hir::{DefWithBody, EditionedFileId, InFile, InRealFile, MacroKind, Name, Semantics};
+use hir::{DefWithBody, EditionedFileId, InFile, InRealFile, MacroKind, Semantics};
 use ide_db::{FxHashMap, FxHashSet, MiniCore, Ranker, RootDatabase, SymbolKind};
 use syntax::{
     AstNode, AstToken, NodeOrToken,
@@ -257,8 +257,7 @@ fn item(&self) -> &ast::Item {
 
     // FIXME: accommodate range highlighting
     let mut body_stack: Vec<Option<DefWithBody>> = vec![];
-    let mut per_body_cache: FxHashMap<DefWithBody, (FxHashSet<_>, FxHashMap<Name, u32>)> =
-        FxHashMap::default();
+    let mut per_body_cache: FxHashMap<DefWithBody, FxHashSet<_>> = FxHashMap::default();
 
     // Walk all nodes, keeping track of whether we are inside a macro or not.
     // If in macro, expand it first and highlight the expanded code.
@@ -422,14 +421,11 @@ fn item(&self) -> &ast::Item {
         }
 
         let edition = descended_element.file_id.edition(sema.db);
-        let (unsafe_ops, bindings_shadow_count) = match current_body {
-            Some(current_body) => {
-                let (ops, bindings) = per_body_cache
-                    .entry(current_body)
-                    .or_insert_with(|| (sema.get_unsafe_ops(current_body), Default::default()));
-                (&*ops, Some(bindings))
-            }
-            None => (&empty, None),
+        let unsafe_ops = match current_body {
+            Some(current_body) => per_body_cache
+                .entry(current_body)
+                .or_insert_with(|| sema.get_unsafe_ops(current_body)),
+            None => &empty,
         };
         let is_unsafe_node =
             |node| unsafe_ops.contains(&InFile::new(descended_element.file_id, node));
@@ -438,7 +434,6 @@ fn item(&self) -> &ast::Item {
                 let hl = highlight::name_like(
                     sema,
                     krate,
-                    bindings_shadow_count,
                     &is_unsafe_node,
                     config.syntactic_name_ref_highlighting,
                     name_like,
diff --git a/src/tools/rust-analyzer/crates/ide/src/syntax_highlighting/highlight.rs b/src/tools/rust-analyzer/crates/ide/src/syntax_highlighting/highlight.rs
index dcc9a8c0d5f7..a94bbc9f041d 100644
--- a/src/tools/rust-analyzer/crates/ide/src/syntax_highlighting/highlight.rs
+++ b/src/tools/rust-analyzer/crates/ide/src/syntax_highlighting/highlight.rs
@@ -5,12 +5,11 @@
 use either::Either;
 use hir::{AsAssocItem, HasAttrs, HasVisibility, Semantics};
 use ide_db::{
-    FxHashMap, RootDatabase, SymbolKind,
+    RootDatabase, SymbolKind,
     defs::{Definition, IdentClass, NameClass, NameRefClass},
     syntax_helpers::node_ext::walk_pat,
 };
 use span::Edition;
-use stdx::hash_once;
 use syntax::{
     AstNode, AstPtr, AstToken, NodeOrToken,
     SyntaxKind::{self, *},
@@ -64,7 +63,6 @@ pub(super) fn token(
 pub(super) fn name_like(
     sema: &Semantics<'_, RootDatabase>,
     krate: Option<hir::Crate>,
-    bindings_shadow_count: Option<&mut FxHashMap<hir::Name, u32>>,
     is_unsafe_node: &impl Fn(AstPtr<Either<ast::Expr, ast::Pat>>) -> bool,
     syntactic_name_ref_highlighting: bool,
     name_like: ast::NameLike,
@@ -75,22 +73,15 @@ pub(super) fn name_like(
         ast::NameLike::NameRef(name_ref) => highlight_name_ref(
             sema,
             krate,
-            bindings_shadow_count,
             &mut binding_hash,
             is_unsafe_node,
             syntactic_name_ref_highlighting,
             name_ref,
             edition,
         ),
-        ast::NameLike::Name(name) => highlight_name(
-            sema,
-            bindings_shadow_count,
-            &mut binding_hash,
-            is_unsafe_node,
-            krate,
-            name,
-            edition,
-        ),
+        ast::NameLike::Name(name) => {
+            highlight_name(sema, &mut binding_hash, is_unsafe_node, krate, name, edition)
+        }
         ast::NameLike::Lifetime(lifetime) => match IdentClass::classify_lifetime(sema, &lifetime) {
             Some(IdentClass::NameClass(NameClass::Definition(def))) => {
                 highlight_def(sema, krate, def, edition, false) | HlMod::Definition
@@ -273,7 +264,6 @@ fn keyword(token: SyntaxToken, kind: SyntaxKind) -> Highlight {
 fn highlight_name_ref(
     sema: &Semantics<'_, RootDatabase>,
     krate: Option<hir::Crate>,
-    bindings_shadow_count: Option<&mut FxHashMap<hir::Name, u32>>,
     binding_hash: &mut Option<u64>,
     is_unsafe_node: &impl Fn(AstPtr<Either<ast::Expr, ast::Pat>>) -> bool,
     syntactic_name_ref_highlighting: bool,
@@ -306,12 +296,8 @@ fn highlight_name_ref(
     };
     let mut h = match name_class {
         NameRefClass::Definition(def, _) => {
-            if let Definition::Local(local) = &def
-                && let Some(bindings_shadow_count) = bindings_shadow_count
-            {
-                let name = local.name(sema.db);
-                let shadow_count = bindings_shadow_count.entry(name.clone()).or_default();
-                *binding_hash = Some(calc_binding_hash(&name, *shadow_count))
+            if let Definition::Local(local) = &def {
+                *binding_hash = Some(local.as_id() as u64);
             };
 
             let mut h = highlight_def(sema, krate, def, edition, true);
@@ -432,7 +418,6 @@ fn highlight_name_ref(
 
 fn highlight_name(
     sema: &Semantics<'_, RootDatabase>,
-    bindings_shadow_count: Option<&mut FxHashMap<hir::Name, u32>>,
     binding_hash: &mut Option<u64>,
     is_unsafe_node: &impl Fn(AstPtr<Either<ast::Expr, ast::Pat>>) -> bool,
     krate: Option<hir::Crate>,
@@ -440,13 +425,8 @@ fn highlight_name(
     edition: Edition,
 ) -> Highlight {
     let name_kind = NameClass::classify(sema, &name);
-    if let Some(NameClass::Definition(Definition::Local(local))) = &name_kind
-        && let Some(bindings_shadow_count) = bindings_shadow_count
-    {
-        let name = local.name(sema.db);
-        let shadow_count = bindings_shadow_count.entry(name.clone()).or_default();
-        *shadow_count += 1;
-        *binding_hash = Some(calc_binding_hash(&name, *shadow_count))
+    if let Some(NameClass::Definition(Definition::Local(local))) = &name_kind {
+        *binding_hash = Some(local.as_id() as u64);
     };
     match name_kind {
         Some(NameClass::Definition(def)) => {
@@ -474,10 +454,6 @@ fn highlight_name(
     }
 }
 
-fn calc_binding_hash(name: &hir::Name, shadow_count: u32) -> u64 {
-    hash_once::<ide_db::FxHasher>((name.as_str(), shadow_count))
-}
-
 pub(super) fn highlight_def(
     sema: &Semantics<'_, RootDatabase>,
     krate: Option<hir::Crate>,
diff --git a/src/tools/rust-analyzer/crates/ide/src/syntax_highlighting/test_data/highlight_rainbow.html b/src/tools/rust-analyzer/crates/ide/src/syntax_highlighting/test_data/highlight_rainbow.html
index d5401e7aec91..7c64707ac1f9 100644
--- a/src/tools/rust-analyzer/crates/ide/src/syntax_highlighting/test_data/highlight_rainbow.html
+++ b/src/tools/rust-analyzer/crates/ide/src/syntax_highlighting/test_data/highlight_rainbow.html
@@ -42,14 +42,14 @@ pre                 { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padd
 .unresolved_reference    { color: #FC5555; text-decoration: wavy underline; }
 </style>
 <pre><code><span class="keyword">fn</span> <span class="function declaration">main</span><span class="parenthesis">(</span><span class="parenthesis">)</span> <span class="brace">{</span>
-    <span class="keyword">let</span> <span class="variable declaration reference" data-binding-hash="18084384843626695225" style="color: hsl(154,95%,53%);">hello</span> <span class="operator">=</span> <span class="string_literal">"hello"</span><span class="semicolon">;</span>
-    <span class="keyword">let</span> <span class="variable declaration" data-binding-hash="5697120079570210533" style="color: hsl(268,86%,80%);">x</span> <span class="operator">=</span> <span class="variable reference" data-binding-hash="18084384843626695225" style="color: hsl(154,95%,53%);">hello</span><span class="operator">.</span><span class="unresolved_reference">to_string</span><span class="parenthesis">(</span><span class="parenthesis">)</span><span class="semicolon">;</span>
-    <span class="keyword">let</span> <span class="variable declaration" data-binding-hash="4222724691718692706" style="color: hsl(156,71%,51%);">y</span> <span class="operator">=</span> <span class="variable reference" data-binding-hash="18084384843626695225" style="color: hsl(154,95%,53%);">hello</span><span class="operator">.</span><span class="unresolved_reference">to_string</span><span class="parenthesis">(</span><span class="parenthesis">)</span><span class="semicolon">;</span>
+    <span class="keyword">let</span> <span class="variable declaration reference" data-binding-hash="0" style="color: hsl(74,59%,48%);">hello</span> <span class="operator">=</span> <span class="string_literal">"hello"</span><span class="semicolon">;</span>
+    <span class="keyword">let</span> <span class="variable declaration" data-binding-hash="1" style="color: hsl(152,51%,64%);">x</span> <span class="operator">=</span> <span class="variable reference" data-binding-hash="0" style="color: hsl(74,59%,48%);">hello</span><span class="operator">.</span><span class="unresolved_reference">to_string</span><span class="parenthesis">(</span><span class="parenthesis">)</span><span class="semicolon">;</span>
+    <span class="keyword">let</span> <span class="variable declaration" data-binding-hash="2" style="color: hsl(272,82%,82%);">y</span> <span class="operator">=</span> <span class="variable reference" data-binding-hash="0" style="color: hsl(74,59%,48%);">hello</span><span class="operator">.</span><span class="unresolved_reference">to_string</span><span class="parenthesis">(</span><span class="parenthesis">)</span><span class="semicolon">;</span>
 
-    <span class="keyword">let</span> <span class="variable declaration reference" data-binding-hash="17855021198829413584" style="color: hsl(230,76%,79%);">x</span> <span class="operator">=</span> <span class="string_literal">"other color please!"</span><span class="semicolon">;</span>
-    <span class="keyword">let</span> <span class="variable declaration" data-binding-hash="16380625810977895757" style="color: hsl(262,75%,75%);">y</span> <span class="operator">=</span> <span class="variable reference" data-binding-hash="17855021198829413584" style="color: hsl(230,76%,79%);">x</span><span class="operator">.</span><span class="unresolved_reference">to_string</span><span class="parenthesis">(</span><span class="parenthesis">)</span><span class="semicolon">;</span>
+    <span class="keyword">let</span> <span class="variable declaration reference" data-binding-hash="3" style="color: hsl(107,98%,81%);">x</span> <span class="operator">=</span> <span class="string_literal">"other color please!"</span><span class="semicolon">;</span>
+    <span class="keyword">let</span> <span class="variable declaration" data-binding-hash="4" style="color: hsl(241,93%,64%);">y</span> <span class="operator">=</span> <span class="variable reference" data-binding-hash="3" style="color: hsl(107,98%,81%);">x</span><span class="operator">.</span><span class="unresolved_reference">to_string</span><span class="parenthesis">(</span><span class="parenthesis">)</span><span class="semicolon">;</span>
 <span class="brace">}</span>
 
 <span class="keyword">fn</span> <span class="function declaration">bar</span><span class="parenthesis">(</span><span class="parenthesis">)</span> <span class="brace">{</span>
-    <span class="keyword">let</span> <span class="keyword">mut</span> <span class="variable declaration mutable reference" data-binding-hash="18084384843626695225" style="color: hsl(154,95%,53%);">hello</span> <span class="operator">=</span> <span class="string_literal">"hello"</span><span class="semicolon">;</span>
+    <span class="keyword">let</span> <span class="keyword">mut</span> <span class="variable declaration mutable reference" data-binding-hash="0" style="color: hsl(74,59%,48%);">hello</span> <span class="operator">=</span> <span class="string_literal">"hello"</span><span class="semicolon">;</span>
 <span class="brace">}</span></code></pre>
\ No newline at end of file
diff --git a/src/tools/rust-analyzer/crates/ide/src/typing.rs b/src/tools/rust-analyzer/crates/ide/src/typing.rs
index 0381865fed45..f8b0dbfe6282 100644
--- a/src/tools/rust-analyzer/crates/ide/src/typing.rs
+++ b/src/tools/rust-analyzer/crates/ide/src/typing.rs
@@ -17,7 +17,10 @@
 
 use either::Either;
 use hir::EditionedFileId;
-use ide_db::{FilePosition, RootDatabase, base_db::RootQueryDb};
+use ide_db::{
+    FilePosition, RootDatabase,
+    base_db::{RootQueryDb, SourceDatabase},
+};
 use span::Edition;
 use std::iter;
 
@@ -70,11 +73,12 @@ pub(crate) fn on_char_typed(
     if !TRIGGER_CHARS.contains(&char_typed) {
         return None;
     }
-    // FIXME: We need to figure out the edition of the file here, but that means hitting the
-    // database for more than just parsing the file which is bad.
+    let edition = db
+        .source_root_crates(db.file_source_root(position.file_id).source_root_id(db))
+        .first()
+        .map_or(Edition::CURRENT, |crates| crates.data(db).edition);
     // FIXME: We are hitting the database here, if we are unlucky this call might block momentarily
-    // causing the editor to feel sluggish!
-    let edition = Edition::CURRENT_FIXME;
+    // causing the editor to feel sluggish! We need to make this bail if it would block too long?
     let editioned_file_id_wrapper = EditionedFileId::from_span_guess_origin(
         db,
         span::EditionedFileId::new(position.file_id, edition),
@@ -457,8 +461,8 @@ fn do_type_char(char_typed: char, before: &str) -> Option<String> {
         let (offset, mut before) = extract_offset(before);
         let edit = TextEdit::insert(offset, char_typed.to_string());
         edit.apply(&mut before);
-        let parse = SourceFile::parse(&before, span::Edition::CURRENT_FIXME);
-        on_char_typed_(&parse, offset, char_typed, span::Edition::CURRENT_FIXME).map(|it| {
+        let parse = SourceFile::parse(&before, span::Edition::CURRENT);
+        on_char_typed_(&parse, offset, char_typed, span::Edition::CURRENT).map(|it| {
             it.apply(&mut before);
             before.to_string()
         })
diff --git a/src/tools/rust-analyzer/crates/intern/src/symbol/symbols.rs b/src/tools/rust-analyzer/crates/intern/src/symbol/symbols.rs
index 2be4e41f4f1a..cc09a1aae7a6 100644
--- a/src/tools/rust-analyzer/crates/intern/src/symbol/symbols.rs
+++ b/src/tools/rust-analyzer/crates/intern/src/symbol/symbols.rs
@@ -110,6 +110,7 @@ pub(super) fn prefill() -> DashMap<Symbol, (), BuildHasherDefault<FxHasher>> {
     win64_dash_unwind = "win64-unwind",
     x86_dash_interrupt = "x86-interrupt",
     rust_dash_preserve_dash_none = "preserve-none",
+    _0_u8 = "0_u8",
 
     @PLAIN:
     __ra_fixup,
@@ -285,6 +286,7 @@ pub(super) fn prefill() -> DashMap<Symbol, (), BuildHasherDefault<FxHasher>> {
     Into,
     into_future,
     into_iter,
+    into_try_type,
     IntoFuture,
     IntoIter,
     IntoIterator,
diff --git a/src/tools/rust-analyzer/crates/parser/src/grammar/expressions/atom.rs b/src/tools/rust-analyzer/crates/parser/src/grammar/expressions/atom.rs
index d83e2eb2b4ae..b75474ee2b86 100644
--- a/src/tools/rust-analyzer/crates/parser/src/grammar/expressions/atom.rs
+++ b/src/tools/rust-analyzer/crates/parser/src/grammar/expressions/atom.rs
@@ -976,11 +976,17 @@ fn break_expr(p: &mut Parser<'_>, r: Restrictions) -> CompletedMarker {
 // test try_block_expr
 // fn foo() {
 //     let _ = try {};
+//     let _ = try bikeshed T<U> {};
 // }
 fn try_block_expr(p: &mut Parser<'_>, m: Option<Marker>) -> CompletedMarker {
     assert!(p.at(T![try]));
     let m = m.unwrap_or_else(|| p.start());
+    let try_modifier = p.start();
     p.bump(T![try]);
+    if p.eat_contextual_kw(T![bikeshed]) {
+        type_(p);
+    }
+    try_modifier.complete(p, TRY_BLOCK_MODIFIER);
     if p.at(T!['{']) {
         stmt_list(p);
     } else {
diff --git a/src/tools/rust-analyzer/crates/parser/src/syntax_kind/generated.rs b/src/tools/rust-analyzer/crates/parser/src/syntax_kind/generated.rs
index 5d22d966b2b7..a2295e449550 100644
--- a/src/tools/rust-analyzer/crates/parser/src/syntax_kind/generated.rs
+++ b/src/tools/rust-analyzer/crates/parser/src/syntax_kind/generated.rs
@@ -114,6 +114,7 @@ pub enum SyntaxKind {
     ATT_SYNTAX_KW,
     AUTO_KW,
     AWAIT_KW,
+    BIKESHED_KW,
     BUILTIN_KW,
     CLOBBER_ABI_KW,
     DEFAULT_KW,
@@ -285,6 +286,7 @@ pub enum SyntaxKind {
     STRUCT,
     TOKEN_TREE,
     TRAIT,
+    TRY_BLOCK_MODIFIER,
     TRY_EXPR,
     TUPLE_EXPR,
     TUPLE_FIELD,
@@ -458,6 +460,7 @@ pub const fn text(self) -> &'static str {
             | STRUCT
             | TOKEN_TREE
             | TRAIT
+            | TRY_BLOCK_MODIFIER
             | TRY_EXPR
             | TUPLE_EXPR
             | TUPLE_FIELD
@@ -596,6 +599,7 @@ pub const fn text(self) -> &'static str {
             ASM_KW => "asm",
             ATT_SYNTAX_KW => "att_syntax",
             AUTO_KW => "auto",
+            BIKESHED_KW => "bikeshed",
             BUILTIN_KW => "builtin",
             CLOBBER_ABI_KW => "clobber_abi",
             DEFAULT_KW => "default",
@@ -698,6 +702,7 @@ pub fn is_contextual_keyword(self, edition: Edition) -> bool {
             ASM_KW => true,
             ATT_SYNTAX_KW => true,
             AUTO_KW => true,
+            BIKESHED_KW => true,
             BUILTIN_KW => true,
             CLOBBER_ABI_KW => true,
             DEFAULT_KW => true,
@@ -788,6 +793,7 @@ pub fn is_keyword(self, edition: Edition) -> bool {
             ASM_KW => true,
             ATT_SYNTAX_KW => true,
             AUTO_KW => true,
+            BIKESHED_KW => true,
             BUILTIN_KW => true,
             CLOBBER_ABI_KW => true,
             DEFAULT_KW => true,
@@ -941,6 +947,7 @@ pub fn from_contextual_keyword(ident: &str, edition: Edition) -> Option<SyntaxKi
             "asm" => ASM_KW,
             "att_syntax" => ATT_SYNTAX_KW,
             "auto" => AUTO_KW,
+            "bikeshed" => BIKESHED_KW,
             "builtin" => BUILTIN_KW,
             "clobber_abi" => CLOBBER_ABI_KW,
             "default" => DEFAULT_KW,
@@ -1112,6 +1119,7 @@ pub fn from_char(c: char) -> Option<SyntaxKind> {
     [asm] => { $ crate :: SyntaxKind :: ASM_KW };
     [att_syntax] => { $ crate :: SyntaxKind :: ATT_SYNTAX_KW };
     [auto] => { $ crate :: SyntaxKind :: AUTO_KW };
+    [bikeshed] => { $ crate :: SyntaxKind :: BIKESHED_KW };
     [builtin] => { $ crate :: SyntaxKind :: BUILTIN_KW };
     [clobber_abi] => { $ crate :: SyntaxKind :: CLOBBER_ABI_KW };
     [default] => { $ crate :: SyntaxKind :: DEFAULT_KW };
diff --git a/src/tools/rust-analyzer/crates/parser/test_data/parser/err/0042_weird_blocks.rast b/src/tools/rust-analyzer/crates/parser/test_data/parser/err/0042_weird_blocks.rast
index d6d2e75cca67..9e4e9dbf9d25 100644
--- a/src/tools/rust-analyzer/crates/parser/test_data/parser/err/0042_weird_blocks.rast
+++ b/src/tools/rust-analyzer/crates/parser/test_data/parser/err/0042_weird_blocks.rast
@@ -45,7 +45,8 @@ SOURCE_FILE
               WHITESPACE " "
               EXPR_STMT
                 BLOCK_EXPR
-                  TRY_KW "try"
+                  TRY_BLOCK_MODIFIER
+                    TRY_KW "try"
               WHITESPACE " "
               LITERAL
                 INT_NUMBER "92"
diff --git a/src/tools/rust-analyzer/crates/parser/test_data/parser/inline/ok/try_block_expr.rast b/src/tools/rust-analyzer/crates/parser/test_data/parser/inline/ok/try_block_expr.rast
index aec8fbf4775c..472ce711c5fe 100644
--- a/src/tools/rust-analyzer/crates/parser/test_data/parser/inline/ok/try_block_expr.rast
+++ b/src/tools/rust-analyzer/crates/parser/test_data/parser/inline/ok/try_block_expr.rast
@@ -21,7 +21,42 @@ SOURCE_FILE
           EQ "="
           WHITESPACE " "
           BLOCK_EXPR
-            TRY_KW "try"
+            TRY_BLOCK_MODIFIER
+              TRY_KW "try"
+            WHITESPACE " "
+            STMT_LIST
+              L_CURLY "{"
+              R_CURLY "}"
+          SEMICOLON ";"
+        WHITESPACE "\n    "
+        LET_STMT
+          LET_KW "let"
+          WHITESPACE " "
+          WILDCARD_PAT
+            UNDERSCORE "_"
+          WHITESPACE " "
+          EQ "="
+          WHITESPACE " "
+          BLOCK_EXPR
+            TRY_BLOCK_MODIFIER
+              TRY_KW "try"
+              WHITESPACE " "
+              BIKESHED_KW "bikeshed"
+              WHITESPACE " "
+              PATH_TYPE
+                PATH
+                  PATH_SEGMENT
+                    NAME_REF
+                      IDENT "T"
+                    GENERIC_ARG_LIST
+                      L_ANGLE "<"
+                      TYPE_ARG
+                        PATH_TYPE
+                          PATH
+                            PATH_SEGMENT
+                              NAME_REF
+                                IDENT "U"
+                      R_ANGLE ">"
             WHITESPACE " "
             STMT_LIST
               L_CURLY "{"
diff --git a/src/tools/rust-analyzer/crates/parser/test_data/parser/inline/ok/try_block_expr.rs b/src/tools/rust-analyzer/crates/parser/test_data/parser/inline/ok/try_block_expr.rs
index 0f1b41eb64b4..719980473c3b 100644
--- a/src/tools/rust-analyzer/crates/parser/test_data/parser/inline/ok/try_block_expr.rs
+++ b/src/tools/rust-analyzer/crates/parser/test_data/parser/inline/ok/try_block_expr.rs
@@ -1,3 +1,4 @@
 fn foo() {
     let _ = try {};
+    let _ = try bikeshed T<U> {};
 }
diff --git a/src/tools/rust-analyzer/crates/project-model/src/sysroot.rs b/src/tools/rust-analyzer/crates/project-model/src/sysroot.rs
index f244c9736c7c..546a1e05a063 100644
--- a/src/tools/rust-analyzer/crates/project-model/src/sysroot.rs
+++ b/src/tools/rust-analyzer/crates/project-model/src/sysroot.rs
@@ -275,7 +275,10 @@ pub fn load_workspace(
             }
             tracing::debug!("Stitching sysroot library: {src_root}");
 
-            let mut stitched = stitched::Stitched { crates: Default::default() };
+            let mut stitched = stitched::Stitched {
+                crates: Default::default(),
+                edition: span::Edition::Edition2024,
+            };
 
             for path in stitched::SYSROOT_CRATES.trim().lines() {
                 let name = path.split('/').next_back().unwrap();
@@ -511,6 +514,7 @@ pub(crate) mod stitched {
     #[derive(Debug, Clone, Eq, PartialEq)]
     pub struct Stitched {
         pub(super) crates: Arena<RustLibSrcCrateData>,
+        pub(crate) edition: span::Edition,
     }
 
     impl ops::Index<RustLibSrcCrate> for Stitched {
diff --git a/src/tools/rust-analyzer/crates/project-model/src/workspace.rs b/src/tools/rust-analyzer/crates/project-model/src/workspace.rs
index 8f15f7e1507c..581b5fa51446 100644
--- a/src/tools/rust-analyzer/crates/project-model/src/workspace.rs
+++ b/src/tools/rust-analyzer/crates/project-model/src/workspace.rs
@@ -1831,7 +1831,7 @@ fn sysroot_to_crate_graph(
                     let display_name = CrateDisplayName::from_canonical_name(&stitched[krate].name);
                     let crate_id = crate_graph.add_crate_root(
                         file_id,
-                        Edition::CURRENT_FIXME,
+                        stitched.edition,
                         Some(display_name),
                         None,
                         cfg_options.clone(),
diff --git a/src/tools/rust-analyzer/crates/rust-analyzer/src/flycheck.rs b/src/tools/rust-analyzer/crates/rust-analyzer/src/flycheck.rs
index 512c231990cb..c74f4550fd89 100644
--- a/src/tools/rust-analyzer/crates/rust-analyzer/src/flycheck.rs
+++ b/src/tools/rust-analyzer/crates/rust-analyzer/src/flycheck.rs
@@ -22,7 +22,6 @@
 pub(crate) use cargo_metadata::diagnostic::{
     Applicability, Diagnostic, DiagnosticCode, DiagnosticLevel, DiagnosticSpan,
 };
-use toolchain::DISPLAY_COMMAND_IGNORE_ENVS;
 use toolchain::Tool;
 use triomphe::Arc;
 
@@ -144,6 +143,7 @@ pub(crate) fn invocation_strategy(&self) -> InvocationStrategy {
 }
 
 impl fmt::Display for FlycheckConfig {
+    /// Show a shortened version of the check command.
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
             FlycheckConfig::Automatic { cargo_options, .. } => {
@@ -153,12 +153,23 @@ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
                 // Don't show `my_custom_check --foo $saved_file` literally to the user, as it
                 // looks like we've forgotten to substitute $saved_file.
                 //
+                // `my_custom_check --foo /home/user/project/src/dir/foo.rs` is too verbose.
+                //
                 // Instead, show `my_custom_check --foo ...`. The
                 // actual path is often too long to be worth showing
                 // in the IDE (e.g. in the VS Code status bar).
                 let display_args = args
                     .iter()
-                    .map(|arg| if arg == SAVED_FILE_PLACEHOLDER_DOLLAR { "..." } else { arg })
+                    .map(|arg| {
+                        if (arg == SAVED_FILE_PLACEHOLDER_DOLLAR)
+                            || (arg == SAVED_FILE_INLINE)
+                            || arg.ends_with(".rs")
+                        {
+                            "..."
+                        } else {
+                            arg
+                        }
+                    })
                     .collect::<Vec<_>>();
 
                 write!(f, "{command} {}", display_args.join(" "))
@@ -403,24 +414,30 @@ struct FlycheckActor {
     /// doesn't provide a way to read sub-process output without blocking, so we
     /// have to wrap sub-processes output handling in a thread and pass messages
     /// back over a channel.
-    command_handle: Option<CommandHandle<CargoCheckMessage>>,
+    command_handle: Option<CommandHandle<CheckMessage>>,
     /// The receiver side of the channel mentioned above.
-    command_receiver: Option<Receiver<CargoCheckMessage>>,
+    command_receiver: Option<Receiver<CheckMessage>>,
     diagnostics_cleared_for: FxHashSet<PackageSpecifier>,
     diagnostics_received: DiagnosticsReceived,
 }
 
-#[derive(PartialEq)]
+#[derive(PartialEq, Debug)]
 enum DiagnosticsReceived {
-    Yes,
-    No,
-    YesAndClearedForAll,
+    /// We started a flycheck, but we haven't seen any diagnostics yet.
+    NotYet,
+    /// We received a non-zero number of diagnostics from rustc or clippy (via
+    /// cargo or custom check command). This means there were errors or
+    /// warnings.
+    AtLeastOne,
+    /// We received a non-zero number of diagnostics, and the scope is
+    /// workspace, so we've discarded the previous workspace diagnostics.
+    AtLeastOneAndClearedWorkspace,
 }
 
 #[allow(clippy::large_enum_variant)]
 enum Event {
     RequestStateChange(StateChange),
-    CheckEvent(Option<CargoCheckMessage>),
+    CheckEvent(Option<CheckMessage>),
 }
 
 /// This is stable behaviour. Don't change.
@@ -511,7 +528,7 @@ fn new(
             command_handle: None,
             command_receiver: None,
             diagnostics_cleared_for: Default::default(),
-            diagnostics_received: DiagnosticsReceived::No,
+            diagnostics_received: DiagnosticsReceived::NotYet,
         }
     }
 
@@ -563,23 +580,13 @@ fn run(mut self, inbox: Receiver<StateChange>) {
                     };
 
                     let debug_command = format!("{command:?}");
-                    let user_facing_command = match origin {
-                        // Don't show all the --format=json-with-blah-blah args, just the simple
-                        // version
-                        FlycheckCommandOrigin::Cargo => self.config.to_string(),
-                        // show them the full command but pretty printed. advanced user
-                        FlycheckCommandOrigin::ProjectJsonRunnable
-                        | FlycheckCommandOrigin::CheckOverrideCommand => display_command(
-                            &command,
-                            Some(std::path::Path::new(self.root.as_path())),
-                        ),
-                    };
+                    let user_facing_command = self.config.to_string();
 
                     tracing::debug!(?origin, ?command, "will restart flycheck");
                     let (sender, receiver) = unbounded();
                     match CommandHandle::spawn(
                         command,
-                        CargoCheckParser,
+                        CheckParser,
                         sender,
                         match &self.config {
                             FlycheckConfig::Automatic { cargo_options, .. } => {
@@ -640,7 +647,7 @@ fn run(mut self, inbox: Receiver<StateChange>) {
                             error
                         );
                     }
-                    if self.diagnostics_received == DiagnosticsReceived::No {
+                    if self.diagnostics_received == DiagnosticsReceived::NotYet {
                         tracing::trace!(flycheck_id = self.id, "clearing diagnostics");
                         // We finished without receiving any diagnostics.
                         // Clear everything for good measure
@@ -699,7 +706,7 @@ fn run(mut self, inbox: Receiver<StateChange>) {
                     self.report_progress(Progress::DidFinish(res));
                 }
                 Event::CheckEvent(Some(message)) => match message {
-                    CargoCheckMessage::CompilerArtifact(msg) => {
+                    CheckMessage::CompilerArtifact(msg) => {
                         tracing::trace!(
                             flycheck_id = self.id,
                             artifact = msg.target.name,
@@ -729,46 +736,75 @@ fn run(mut self, inbox: Receiver<StateChange>) {
                             });
                         }
                     }
-                    CargoCheckMessage::Diagnostic { diagnostic, package_id } => {
+                    CheckMessage::Diagnostic { diagnostic, package_id } => {
                         tracing::trace!(
                             flycheck_id = self.id,
                             message = diagnostic.message,
                             package_id = package_id.as_ref().map(|it| it.as_str()),
+                            scope = ?self.scope,
                             "diagnostic received"
                         );
-                        if self.diagnostics_received == DiagnosticsReceived::No {
-                            self.diagnostics_received = DiagnosticsReceived::Yes;
-                        }
-                        if let Some(package_id) = &package_id {
-                            if self.diagnostics_cleared_for.insert(package_id.clone()) {
-                                tracing::trace!(
-                                    flycheck_id = self.id,
-                                    package_id = package_id.as_str(),
-                                    "clearing diagnostics"
-                                );
-                                self.send(FlycheckMessage::ClearDiagnostics {
+
+                        match &self.scope {
+                            FlycheckScope::Workspace => {
+                                if self.diagnostics_received == DiagnosticsReceived::NotYet {
+                                    self.send(FlycheckMessage::ClearDiagnostics {
+                                        id: self.id,
+                                        kind: ClearDiagnosticsKind::All(ClearScope::Workspace),
+                                    });
+
+                                    self.diagnostics_received =
+                                        DiagnosticsReceived::AtLeastOneAndClearedWorkspace;
+                                }
+
+                                if let Some(package_id) = package_id {
+                                    tracing::warn!(
+                                        "Ignoring package label {:?} and applying diagnostics to the whole workspace",
+                                        package_id
+                                    );
+                                }
+
+                                self.send(FlycheckMessage::AddDiagnostic {
                                     id: self.id,
-                                    kind: ClearDiagnosticsKind::All(ClearScope::Package(
-                                        package_id.clone(),
-                                    )),
+                                    generation: self.generation,
+                                    package_id: None,
+                                    workspace_root: self.root.clone(),
+                                    diagnostic,
+                                });
+                            }
+                            FlycheckScope::Package { package: flycheck_package, .. } => {
+                                if self.diagnostics_received == DiagnosticsReceived::NotYet {
+                                    self.diagnostics_received = DiagnosticsReceived::AtLeastOne;
+                                }
+
+                                // If the package has been set in the diagnostic JSON, respect that. Otherwise, use the
+                                // package that the current flycheck is scoped to. This is useful when a project is
+                                // directly using rustc for its checks (e.g. custom check commands in rust-project.json).
+                                let package_id = package_id.unwrap_or(flycheck_package.clone());
+
+                                if self.diagnostics_cleared_for.insert(package_id.clone()) {
+                                    tracing::trace!(
+                                        flycheck_id = self.id,
+                                        package_id = package_id.as_str(),
+                                        "clearing diagnostics"
+                                    );
+                                    self.send(FlycheckMessage::ClearDiagnostics {
+                                        id: self.id,
+                                        kind: ClearDiagnosticsKind::All(ClearScope::Package(
+                                            package_id.clone(),
+                                        )),
+                                    });
+                                }
+
+                                self.send(FlycheckMessage::AddDiagnostic {
+                                    id: self.id,
+                                    generation: self.generation,
+                                    package_id: Some(package_id),
+                                    workspace_root: self.root.clone(),
+                                    diagnostic,
                                 });
                             }
-                        } else if self.diagnostics_received
-                            != DiagnosticsReceived::YesAndClearedForAll
-                        {
-                            self.diagnostics_received = DiagnosticsReceived::YesAndClearedForAll;
-                            self.send(FlycheckMessage::ClearDiagnostics {
-                                id: self.id,
-                                kind: ClearDiagnosticsKind::All(ClearScope::Workspace),
-                            });
                         }
-                        self.send(FlycheckMessage::AddDiagnostic {
-                            id: self.id,
-                            generation: self.generation,
-                            package_id,
-                            workspace_root: self.root.clone(),
-                            diagnostic,
-                        });
                     }
                 },
             }
@@ -792,7 +828,7 @@ fn cancel_check_process(&mut self) {
 
     fn clear_diagnostics_state(&mut self) {
         self.diagnostics_cleared_for.clear();
-        self.diagnostics_received = DiagnosticsReceived::No;
+        self.diagnostics_received = DiagnosticsReceived::NotYet;
     }
 
     fn explicit_check_command(
@@ -942,15 +978,18 @@ fn send(&self, check_task: FlycheckMessage) {
 }
 
 #[allow(clippy::large_enum_variant)]
-enum CargoCheckMessage {
+enum CheckMessage {
+    /// A message from `cargo check`, including details like the path
+    /// to the relevant `Cargo.toml`.
     CompilerArtifact(cargo_metadata::Artifact),
+    /// A diagnostic message from rustc itself.
     Diagnostic { diagnostic: Diagnostic, package_id: Option<PackageSpecifier> },
 }
 
-struct CargoCheckParser;
+struct CheckParser;
 
-impl JsonLinesParser<CargoCheckMessage> for CargoCheckParser {
-    fn from_line(&self, line: &str, error: &mut String) -> Option<CargoCheckMessage> {
+impl JsonLinesParser<CheckMessage> for CheckParser {
+    fn from_line(&self, line: &str, error: &mut String) -> Option<CheckMessage> {
         let mut deserializer = serde_json::Deserializer::from_str(line);
         deserializer.disable_recursion_limit();
         if let Ok(message) = JsonMessage::deserialize(&mut deserializer) {
@@ -958,10 +997,10 @@ fn from_line(&self, line: &str, error: &mut String) -> Option<CargoCheckMessage>
                 // Skip certain kinds of messages to only spend time on what's useful
                 JsonMessage::Cargo(message) => match message {
                     cargo_metadata::Message::CompilerArtifact(artifact) if !artifact.fresh => {
-                        Some(CargoCheckMessage::CompilerArtifact(artifact))
+                        Some(CheckMessage::CompilerArtifact(artifact))
                     }
                     cargo_metadata::Message::CompilerMessage(msg) => {
-                        Some(CargoCheckMessage::Diagnostic {
+                        Some(CheckMessage::Diagnostic {
                             diagnostic: msg.message,
                             package_id: Some(PackageSpecifier::Cargo {
                                 package_id: Arc::new(msg.package_id),
@@ -971,7 +1010,7 @@ fn from_line(&self, line: &str, error: &mut String) -> Option<CargoCheckMessage>
                     _ => None,
                 },
                 JsonMessage::Rustc(message) => {
-                    Some(CargoCheckMessage::Diagnostic { diagnostic: message, package_id: None })
+                    Some(CheckMessage::Diagnostic { diagnostic: message, package_id: None })
                 }
             };
         }
@@ -981,7 +1020,7 @@ fn from_line(&self, line: &str, error: &mut String) -> Option<CargoCheckMessage>
         None
     }
 
-    fn from_eof(&self) -> Option<CargoCheckMessage> {
+    fn from_eof(&self) -> Option<CheckMessage> {
         None
     }
 }
@@ -993,64 +1032,14 @@ enum JsonMessage {
     Rustc(Diagnostic),
 }
 
-/// Not good enough to execute in a shell, but good enough to show the user without all the noisy
-/// quotes
-///
-/// Pass implicit_cwd if there is one regarded as the obvious by the user, so we can skip showing it.
-/// Compactness is the aim of the game, the output typically gets truncated quite a lot.
-fn display_command(c: &Command, implicit_cwd: Option<&std::path::Path>) -> String {
-    let mut o = String::new();
-    use std::fmt::Write;
-    let lossy = std::ffi::OsStr::to_string_lossy;
-    if let Some(dir) = c.get_current_dir() {
-        if Some(dir) == implicit_cwd.map(std::path::Path::new) {
-            // pass
-        } else if dir.to_string_lossy().contains(" ") {
-            write!(o, "cd {:?} && ", dir).unwrap();
-        } else {
-            write!(o, "cd {} && ", dir.display()).unwrap();
-        }
-    }
-    for (env, val) in c.get_envs() {
-        let (env, val) = (lossy(env), val.map(lossy).unwrap_or(std::borrow::Cow::Borrowed("")));
-        if DISPLAY_COMMAND_IGNORE_ENVS.contains(&env.as_ref()) {
-            continue;
-        }
-        if env.contains(" ") {
-            write!(o, "\"{}={}\" ", env, val).unwrap();
-        } else if val.contains(" ") {
-            write!(o, "{}=\"{}\" ", env, val).unwrap();
-        } else {
-            write!(o, "{}={} ", env, val).unwrap();
-        }
-    }
-    let prog = lossy(c.get_program());
-    if prog.contains(" ") {
-        write!(o, "{:?}", prog).unwrap();
-    } else {
-        write!(o, "{}", prog).unwrap();
-    }
-    for arg in c.get_args() {
-        let arg = lossy(arg);
-        if arg.contains(" ") {
-            write!(o, " \"{}\"", arg).unwrap();
-        } else {
-            write!(o, " {}", arg).unwrap();
-        }
-    }
-    o
-}
-
 #[cfg(test)]
 mod tests {
+    use super::*;
     use ide_db::FxHashMap;
     use itertools::Itertools;
     use paths::Utf8Path;
     use project_model::project_json;
 
-    use crate::flycheck::Substitutions;
-    use crate::flycheck::display_command;
-
     #[test]
     fn test_substitutions() {
         let label = ":label";
@@ -1139,34 +1128,47 @@ fn test_substitute(
     }
 
     #[test]
-    fn test_display_command() {
-        use std::path::Path;
-        let workdir = Path::new("workdir");
-        let mut cmd = toolchain::command("command", workdir, &FxHashMap::default());
-        assert_eq!(display_command(cmd.arg("--arg"), Some(workdir)), "command --arg");
-        assert_eq!(
-            display_command(cmd.arg("spaced arg"), Some(workdir)),
-            "command --arg \"spaced arg\""
-        );
-        assert_eq!(
-            display_command(cmd.env("ENVIRON", "yeah"), Some(workdir)),
-            "ENVIRON=yeah command --arg \"spaced arg\""
-        );
-        assert_eq!(
-            display_command(cmd.env("OTHER", "spaced env"), Some(workdir)),
-            "ENVIRON=yeah OTHER=\"spaced env\" command --arg \"spaced arg\""
-        );
-        assert_eq!(
-            display_command(cmd.current_dir("/tmp"), Some(workdir)),
-            "cd /tmp && ENVIRON=yeah OTHER=\"spaced env\" command --arg \"spaced arg\""
-        );
-        assert_eq!(
-            display_command(cmd.current_dir("/tmp and/thing"), Some(workdir)),
-            "cd \"/tmp and/thing\" && ENVIRON=yeah OTHER=\"spaced env\" command --arg \"spaced arg\""
-        );
-        assert_eq!(
-            display_command(cmd.current_dir("/tmp and/thing"), Some(Path::new("/tmp and/thing"))),
-            "ENVIRON=yeah OTHER=\"spaced env\" command --arg \"spaced arg\""
-        );
+    fn test_flycheck_config_display() {
+        let clippy = FlycheckConfig::Automatic {
+            cargo_options: CargoOptions {
+                subcommand: "clippy".to_owned(),
+                target_tuples: vec![],
+                all_targets: false,
+                set_test: false,
+                no_default_features: false,
+                all_features: false,
+                features: vec![],
+                extra_args: vec![],
+                extra_test_bin_args: vec![],
+                extra_env: FxHashMap::default(),
+                target_dir_config: TargetDirectoryConfig::default(),
+            },
+            ansi_color_output: true,
+        };
+        assert_eq!(clippy.to_string(), "cargo clippy");
+
+        let custom_dollar = FlycheckConfig::CustomCommand {
+            command: "check".to_owned(),
+            args: vec!["--input".to_owned(), "$saved_file".to_owned()],
+            extra_env: FxHashMap::default(),
+            invocation_strategy: InvocationStrategy::Once,
+        };
+        assert_eq!(custom_dollar.to_string(), "check --input ...");
+
+        let custom_inline = FlycheckConfig::CustomCommand {
+            command: "check".to_owned(),
+            args: vec!["--input".to_owned(), "{saved_file}".to_owned()],
+            extra_env: FxHashMap::default(),
+            invocation_strategy: InvocationStrategy::Once,
+        };
+        assert_eq!(custom_inline.to_string(), "check --input ...");
+
+        let custom_rs = FlycheckConfig::CustomCommand {
+            command: "check".to_owned(),
+            args: vec!["--input".to_owned(), "/path/to/file.rs".to_owned()],
+            extra_env: FxHashMap::default(),
+            invocation_strategy: InvocationStrategy::Once,
+        };
+        assert_eq!(custom_rs.to_string(), "check --input ...");
     }
 }
diff --git a/src/tools/rust-analyzer/crates/rust-analyzer/src/global_state.rs b/src/tools/rust-analyzer/crates/rust-analyzer/src/global_state.rs
index afd4162de622..1462727df4e1 100644
--- a/src/tools/rust-analyzer/crates/rust-analyzer/src/global_state.rs
+++ b/src/tools/rust-analyzer/crates/rust-analyzer/src/global_state.rs
@@ -14,7 +14,7 @@
 use ide::{Analysis, AnalysisHost, Cancellable, FileId, SourceRootId};
 use ide_db::{
     MiniCore,
-    base_db::{Crate, ProcMacroPaths, SourceDatabase, salsa::Revision},
+    base_db::{Crate, ProcMacroPaths, SourceDatabase, salsa::CancellationToken, salsa::Revision},
 };
 use itertools::Itertools;
 use load_cargo::SourceRootConfig;
@@ -88,6 +88,7 @@ pub(crate) struct GlobalState {
     pub(crate) task_pool: Handle<TaskPool<Task>, Receiver<Task>>,
     pub(crate) fmt_pool: Handle<TaskPool<Task>, Receiver<Task>>,
     pub(crate) cancellation_pool: thread::Pool,
+    pub(crate) cancellation_tokens: FxHashMap<lsp_server::RequestId, CancellationToken>,
 
     pub(crate) config: Arc<Config>,
     pub(crate) config_errors: Option<ConfigErrors>,
@@ -265,6 +266,7 @@ pub(crate) fn new(sender: Sender<lsp_server::Message>, config: Config) -> Global
             task_pool,
             fmt_pool,
             cancellation_pool,
+            cancellation_tokens: Default::default(),
             loader,
             config: Arc::new(config.clone()),
             analysis_host,
@@ -617,6 +619,7 @@ pub(crate) fn register_request(
     }
 
     pub(crate) fn respond(&mut self, response: lsp_server::Response) {
+        self.cancellation_tokens.remove(&response.id);
         if let Some((method, start)) = self.req_queue.incoming.complete(&response.id) {
             if let Some(err) = &response.error
                 && err.message.starts_with("server panicked")
@@ -631,6 +634,9 @@ pub(crate) fn respond(&mut self, response: lsp_server::Response) {
     }
 
     pub(crate) fn cancel(&mut self, request_id: lsp_server::RequestId) {
+        if let Some(token) = self.cancellation_tokens.remove(&request_id) {
+            token.cancel();
+        }
         if let Some(response) = self.req_queue.incoming.cancel(request_id) {
             self.send(response.into());
         }
diff --git a/src/tools/rust-analyzer/crates/rust-analyzer/src/handlers/dispatch.rs b/src/tools/rust-analyzer/crates/rust-analyzer/src/handlers/dispatch.rs
index 90deae2d902e..63b4e6430c2d 100644
--- a/src/tools/rust-analyzer/crates/rust-analyzer/src/handlers/dispatch.rs
+++ b/src/tools/rust-analyzer/crates/rust-analyzer/src/handlers/dispatch.rs
@@ -253,6 +253,9 @@ fn on_with_thread_intent<const RUSTFMT: bool, const ALLOW_RETRYING: bool, R>(
         tracing::debug!(?params);
 
         let world = self.global_state.snapshot();
+        self.global_state
+            .cancellation_tokens
+            .insert(req.id.clone(), world.analysis.cancellation_token());
         if RUSTFMT {
             &mut self.global_state.fmt_pool.handle
         } else {
@@ -265,7 +268,19 @@ fn on_with_thread_intent<const RUSTFMT: bool, const ALLOW_RETRYING: bool, R>(
             });
             match thread_result_to_response::<R>(req.id.clone(), result) {
                 Ok(response) => Task::Response(response),
-                Err(_cancelled) if ALLOW_RETRYING => Task::Retry(req),
+                Err(HandlerCancelledError::Inner(
+                    Cancelled::PendingWrite | Cancelled::PropagatedPanic,
+                )) if ALLOW_RETRYING => Task::Retry(req),
+                // Note: Technically the return value here does not matter as we have already responded to the client with this error.
+                Err(HandlerCancelledError::Inner(Cancelled::Local)) => Task::Response(Response {
+                    id: req.id,
+                    result: None,
+                    error: Some(ResponseError {
+                        code: lsp_server::ErrorCode::RequestCanceled as i32,
+                        message: "canceled by client".to_owned(),
+                        data: None,
+                    }),
+                }),
                 Err(_cancelled) => {
                     let error = on_cancelled();
                     Task::Response(Response { id: req.id, result: None, error: Some(error) })
diff --git a/src/tools/rust-analyzer/crates/span/src/hygiene.rs b/src/tools/rust-analyzer/crates/span/src/hygiene.rs
index fe05ef946518..0a81cef52ec5 100644
--- a/src/tools/rust-analyzer/crates/span/src/hygiene.rs
+++ b/src/tools/rust-analyzer/crates/span/src/hygiene.rs
@@ -81,25 +81,24 @@ impl zalsa_::HasJar for SyntaxContext {
     #[derive(Hash)]
     struct StructKey<'db, T0, T1, T2, T3>(T0, T1, T2, T3, std::marker::PhantomData<&'db ()>);
 
-    impl<'db, T0, T1, T2, T3> zalsa_::interned::HashEqLike<StructKey<'db, T0, T1, T2, T3>>
-        for SyntaxContextData
+    impl<'db, T0, T1, T2, T3> zalsa_::HashEqLike<StructKey<'db, T0, T1, T2, T3>> for SyntaxContextData
     where
-        Option<MacroCallId>: zalsa_::interned::HashEqLike<T0>,
-        Transparency: zalsa_::interned::HashEqLike<T1>,
-        Edition: zalsa_::interned::HashEqLike<T2>,
-        SyntaxContext: zalsa_::interned::HashEqLike<T3>,
+        Option<MacroCallId>: zalsa_::HashEqLike<T0>,
+        Transparency: zalsa_::HashEqLike<T1>,
+        Edition: zalsa_::HashEqLike<T2>,
+        SyntaxContext: zalsa_::HashEqLike<T3>,
     {
         fn hash<H: std::hash::Hasher>(&self, h: &mut H) {
-            zalsa_::interned::HashEqLike::<T0>::hash(&self.outer_expn, &mut *h);
-            zalsa_::interned::HashEqLike::<T1>::hash(&self.outer_transparency, &mut *h);
-            zalsa_::interned::HashEqLike::<T2>::hash(&self.edition, &mut *h);
-            zalsa_::interned::HashEqLike::<T3>::hash(&self.parent, &mut *h);
+            zalsa_::HashEqLike::<T0>::hash(&self.outer_expn, &mut *h);
+            zalsa_::HashEqLike::<T1>::hash(&self.outer_transparency, &mut *h);
+            zalsa_::HashEqLike::<T2>::hash(&self.edition, &mut *h);
+            zalsa_::HashEqLike::<T3>::hash(&self.parent, &mut *h);
         }
         fn eq(&self, data: &StructKey<'db, T0, T1, T2, T3>) -> bool {
-            zalsa_::interned::HashEqLike::<T0>::eq(&self.outer_expn, &data.0)
-                && zalsa_::interned::HashEqLike::<T1>::eq(&self.outer_transparency, &data.1)
-                && zalsa_::interned::HashEqLike::<T2>::eq(&self.edition, &data.2)
-                && zalsa_::interned::HashEqLike::<T3>::eq(&self.parent, &data.3)
+            zalsa_::HashEqLike::<T0>::eq(&self.outer_expn, &data.0)
+                && zalsa_::HashEqLike::<T1>::eq(&self.outer_transparency, &data.1)
+                && zalsa_::HashEqLike::<T2>::eq(&self.edition, &data.2)
+                && zalsa_::HashEqLike::<T3>::eq(&self.parent, &data.3)
         }
     }
     impl zalsa_struct_::Configuration for SyntaxContext {
@@ -203,10 +202,10 @@ unsafe fn maybe_update(old_pointer: *mut Self, new_value: Self) -> bool {
     impl<'db> SyntaxContext {
         pub fn new<
             Db,
-            T0: zalsa_::interned::Lookup<Option<MacroCallId>> + std::hash::Hash,
-            T1: zalsa_::interned::Lookup<Transparency> + std::hash::Hash,
-            T2: zalsa_::interned::Lookup<Edition> + std::hash::Hash,
-            T3: zalsa_::interned::Lookup<SyntaxContext> + std::hash::Hash,
+            T0: zalsa_::Lookup<Option<MacroCallId>> + std::hash::Hash,
+            T1: zalsa_::Lookup<Transparency> + std::hash::Hash,
+            T2: zalsa_::Lookup<Edition> + std::hash::Hash,
+            T3: zalsa_::Lookup<SyntaxContext> + std::hash::Hash,
         >(
             db: &'db Db,
             outer_expn: T0,
@@ -218,10 +217,10 @@ pub fn new<
         ) -> Self
         where
             Db: ?Sized + salsa::Database,
-            Option<MacroCallId>: zalsa_::interned::HashEqLike<T0>,
-            Transparency: zalsa_::interned::HashEqLike<T1>,
-            Edition: zalsa_::interned::HashEqLike<T2>,
-            SyntaxContext: zalsa_::interned::HashEqLike<T3>,
+            Option<MacroCallId>: zalsa_::HashEqLike<T0>,
+            Transparency: zalsa_::HashEqLike<T1>,
+            Edition: zalsa_::HashEqLike<T2>,
+            SyntaxContext: zalsa_::HashEqLike<T3>,
         {
             let (zalsa, zalsa_local) = db.zalsas();
 
@@ -236,10 +235,10 @@ pub fn new<
                     std::marker::PhantomData,
                 ),
                 |id, data| SyntaxContextData {
-                    outer_expn: zalsa_::interned::Lookup::into_owned(data.0),
-                    outer_transparency: zalsa_::interned::Lookup::into_owned(data.1),
-                    edition: zalsa_::interned::Lookup::into_owned(data.2),
-                    parent: zalsa_::interned::Lookup::into_owned(data.3),
+                    outer_expn: zalsa_::Lookup::into_owned(data.0),
+                    outer_transparency: zalsa_::Lookup::into_owned(data.1),
+                    edition: zalsa_::Lookup::into_owned(data.2),
+                    parent: zalsa_::Lookup::into_owned(data.3),
                     opaque: opaque(zalsa_::FromId::from_id(id)),
                     opaque_and_semiopaque: opaque_and_semiopaque(zalsa_::FromId::from_id(id)),
                 },
diff --git a/src/tools/rust-analyzer/crates/syntax/rust.ungram b/src/tools/rust-analyzer/crates/syntax/rust.ungram
index 991fe7d83a0e..544053408f73 100644
--- a/src/tools/rust-analyzer/crates/syntax/rust.ungram
+++ b/src/tools/rust-analyzer/crates/syntax/rust.ungram
@@ -472,8 +472,11 @@ RefExpr =
 TryExpr =
   Attr* Expr '?'
 
+TryBlockModifier =
+  'try' ('bikeshed' Type)?
+
 BlockExpr =
-  Attr* Label? ('try' | 'unsafe' | ('async' 'move'?) | ('gen' 'move'?) | 'const') StmtList
+  Attr* Label? (TryBlockModifier | 'unsafe' | ('async' 'move'?) | ('gen' 'move'?) | 'const') StmtList
 
 PrefixExpr =
   Attr* op:('-' | '!' | '*') Expr
diff --git a/src/tools/rust-analyzer/crates/syntax/src/ast/expr_ext.rs b/src/tools/rust-analyzer/crates/syntax/src/ast/expr_ext.rs
index db6699538138..b44150f86842 100644
--- a/src/tools/rust-analyzer/crates/syntax/src/ast/expr_ext.rs
+++ b/src/tools/rust-analyzer/crates/syntax/src/ast/expr_ext.rs
@@ -375,7 +375,11 @@ pub fn kind(&self) -> LiteralKind {
 pub enum BlockModifier {
     Async(SyntaxToken),
     Unsafe(SyntaxToken),
-    Try(SyntaxToken),
+    Try {
+        try_token: SyntaxToken,
+        bikeshed_token: Option<SyntaxToken>,
+        result_type: Option<ast::Type>,
+    },
     Const(SyntaxToken),
     AsyncGen(SyntaxToken),
     Gen(SyntaxToken),
@@ -394,7 +398,13 @@ pub fn modifier(&self) -> Option<BlockModifier> {
             })
             .or_else(|| self.async_token().map(BlockModifier::Async))
             .or_else(|| self.unsafe_token().map(BlockModifier::Unsafe))
-            .or_else(|| self.try_token().map(BlockModifier::Try))
+            .or_else(|| {
+                let modifier = self.try_block_modifier()?;
+                let try_token = modifier.try_token()?;
+                let bikeshed_token = modifier.bikeshed_token();
+                let result_type = modifier.ty();
+                Some(BlockModifier::Try { try_token, bikeshed_token, result_type })
+            })
             .or_else(|| self.const_token().map(BlockModifier::Const))
             .or_else(|| self.label().map(BlockModifier::Label))
     }
diff --git a/src/tools/rust-analyzer/crates/syntax/src/ast/generated/nodes.rs b/src/tools/rust-analyzer/crates/syntax/src/ast/generated/nodes.rs
index 7b9f5b9166bb..c4e72eafa793 100644
--- a/src/tools/rust-analyzer/crates/syntax/src/ast/generated/nodes.rs
+++ b/src/tools/rust-analyzer/crates/syntax/src/ast/generated/nodes.rs
@@ -323,6 +323,8 @@ pub fn label(&self) -> Option<Label> { support::child(&self.syntax) }
     #[inline]
     pub fn stmt_list(&self) -> Option<StmtList> { support::child(&self.syntax) }
     #[inline]
+    pub fn try_block_modifier(&self) -> Option<TryBlockModifier> { support::child(&self.syntax) }
+    #[inline]
     pub fn async_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![async]) }
     #[inline]
     pub fn const_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![const]) }
@@ -331,8 +333,6 @@ pub fn gen_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T!
     #[inline]
     pub fn move_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![move]) }
     #[inline]
-    pub fn try_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![try]) }
-    #[inline]
     pub fn unsafe_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![unsafe]) }
 }
 pub struct BoxPat {
@@ -1630,6 +1630,19 @@ pub fn trait_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax,
     #[inline]
     pub fn unsafe_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![unsafe]) }
 }
+pub struct TryBlockModifier {
+    pub(crate) syntax: SyntaxNode,
+}
+impl TryBlockModifier {
+    #[inline]
+    pub fn ty(&self) -> Option<Type> { support::child(&self.syntax) }
+    #[inline]
+    pub fn bikeshed_token(&self) -> Option<SyntaxToken> {
+        support::token(&self.syntax, T![bikeshed])
+    }
+    #[inline]
+    pub fn try_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![try]) }
+}
 pub struct TryExpr {
     pub(crate) syntax: SyntaxNode,
 }
@@ -6320,6 +6333,38 @@ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         f.debug_struct("Trait").field("syntax", &self.syntax).finish()
     }
 }
+impl AstNode for TryBlockModifier {
+    #[inline]
+    fn kind() -> SyntaxKind
+    where
+        Self: Sized,
+    {
+        TRY_BLOCK_MODIFIER
+    }
+    #[inline]
+    fn can_cast(kind: SyntaxKind) -> bool { kind == TRY_BLOCK_MODIFIER }
+    #[inline]
+    fn cast(syntax: SyntaxNode) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) { Some(Self { syntax }) } else { None }
+    }
+    #[inline]
+    fn syntax(&self) -> &SyntaxNode { &self.syntax }
+}
+impl hash::Hash for TryBlockModifier {
+    fn hash<H: hash::Hasher>(&self, state: &mut H) { self.syntax.hash(state); }
+}
+impl Eq for TryBlockModifier {}
+impl PartialEq for TryBlockModifier {
+    fn eq(&self, other: &Self) -> bool { self.syntax == other.syntax }
+}
+impl Clone for TryBlockModifier {
+    fn clone(&self) -> Self { Self { syntax: self.syntax.clone() } }
+}
+impl fmt::Debug for TryBlockModifier {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("TryBlockModifier").field("syntax", &self.syntax).finish()
+    }
+}
 impl AstNode for TryExpr {
     #[inline]
     fn kind() -> SyntaxKind
@@ -9979,6 +10024,11 @@ fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         std::fmt::Display::fmt(self.syntax(), f)
     }
 }
+impl std::fmt::Display for TryBlockModifier {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        std::fmt::Display::fmt(self.syntax(), f)
+    }
+}
 impl std::fmt::Display for TryExpr {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         std::fmt::Display::fmt(self.syntax(), f)
diff --git a/src/tools/rust-analyzer/crates/syntax/src/syntax_error.rs b/src/tools/rust-analyzer/crates/syntax/src/syntax_error.rs
index 1c902893abc6..6f00ef4ed584 100644
--- a/src/tools/rust-analyzer/crates/syntax/src/syntax_error.rs
+++ b/src/tools/rust-analyzer/crates/syntax/src/syntax_error.rs
@@ -9,16 +9,6 @@
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub struct SyntaxError(String, TextRange);
 
-// FIXME: there was an unused SyntaxErrorKind previously (before this enum was removed)
-// It was introduced in this PR: https://github.com/rust-lang/rust-analyzer/pull/846/files#diff-827da9b03b8f9faa1bade5cdd44d5dafR95
-// but it was not removed by a mistake.
-//
-// So, we need to find a place where to stick validation for attributes in match clauses.
-// Code before refactor:
-// InvalidMatchInnerAttr => {
-//    write!(f, "Inner attributes are only allowed directly after the opening brace of the match expression")
-// }
-
 impl SyntaxError {
     pub fn new(message: impl Into<String>, range: TextRange) -> Self {
         Self(message.into(), range)
diff --git a/src/tools/rust-analyzer/crates/test-utils/src/minicore.rs b/src/tools/rust-analyzer/crates/test-utils/src/minicore.rs
index 48c3e8952507..7d95043867ee 100644
--- a/src/tools/rust-analyzer/crates/test-utils/src/minicore.rs
+++ b/src/tools/rust-analyzer/crates/test-utils/src/minicore.rs
@@ -43,6 +43,7 @@
 //!     dispatch_from_dyn: unsize, pin
 //!     hash: sized
 //!     include:
+//!     include_bytes:
 //!     index: sized
 //!     infallible:
 //!     int_impl: size_of, transmute
@@ -953,6 +954,9 @@ pub trait FromResidual<R = <Self as Try>::Residual> {
             #[lang = "from_residual"]
             fn from_residual(residual: R) -> Self;
         }
+        pub const trait Residual<O>: Sized {
+            type TryType: [const] Try<Output = O, Residual = Self>;
+        }
         #[lang = "Try"]
         pub trait Try: FromResidual<Self::Residual> {
             type Output;
@@ -962,6 +966,12 @@ pub trait Try: FromResidual<Self::Residual> {
             #[lang = "branch"]
             fn branch(self) -> ControlFlow<Self::Residual, Self::Output>;
         }
+        #[lang = "into_try_type"]
+        pub const fn residual_into_try_type<R: [const] Residual<O>, O>(
+            r: R,
+        ) -> <R as Residual<O>>::TryType {
+            FromResidual::from_residual(r)
+        }
 
         impl<B, C> Try for ControlFlow<B, C> {
             type Output = C;
@@ -985,6 +995,10 @@ fn from_residual(residual: ControlFlow<B, Infallible>) -> Self {
                 }
             }
         }
+
+        impl<B, C> Residual<C> for ControlFlow<B, Infallible> {
+            type TryType = ControlFlow<B, C>;
+        }
         // region:option
         impl<T> Try for Option<T> {
             type Output = T;
@@ -1008,6 +1022,10 @@ fn from_residual(x: Option<Infallible>) -> Self {
                 }
             }
         }
+
+        impl<T> const Residual<T> for Option<Infallible> {
+            type TryType = Option<T>;
+        }
         // endregion:option
         // region:result
         // region:from
@@ -1037,10 +1055,14 @@ fn from_residual(residual: Result<Infallible, E>) -> Self {
                 }
             }
         }
+
+        impl<T, E> const Residual<T> for Result<Infallible, E> {
+            type TryType = Result<T, E>;
+        }
         // endregion:from
         // endregion:result
     }
-    pub use self::try_::{ControlFlow, FromResidual, Try};
+    pub use self::try_::{ControlFlow, FromResidual, Residual, Try};
     // endregion:try
 
     // region:add
@@ -2040,6 +2062,14 @@ macro_rules! include {
     }
     // endregion:include
 
+    // region:include_bytes
+    #[rustc_builtin_macro]
+    #[macro_export]
+    macro_rules! include_bytes {
+        ($file:expr $(,)?) => {{ /* compiler built-in */ }};
+    }
+    // endregion:include_bytes
+
     // region:concat
     #[rustc_builtin_macro]
     #[macro_export]
diff --git a/src/tools/rust-analyzer/crates/toolchain/src/lib.rs b/src/tools/rust-analyzer/crates/toolchain/src/lib.rs
index 1a1726983870..39319886cfe4 100644
--- a/src/tools/rust-analyzer/crates/toolchain/src/lib.rs
+++ b/src/tools/rust-analyzer/crates/toolchain/src/lib.rs
@@ -74,9 +74,6 @@ pub fn name(self) -> &'static str {
 // Prevent rustup from automatically installing toolchains, see https://github.com/rust-lang/rust-analyzer/issues/20719.
 pub const NO_RUSTUP_AUTO_INSTALL_ENV: (&str, &str) = ("RUSTUP_AUTO_INSTALL", "0");
 
-// These get ignored when displaying what command is running in LSP status messages.
-pub const DISPLAY_COMMAND_IGNORE_ENVS: &[&str] = &[NO_RUSTUP_AUTO_INSTALL_ENV.0];
-
 #[allow(clippy::disallowed_types)] /* generic parameter allows for FxHashMap */
 pub fn command<H>(
     cmd: impl AsRef<OsStr>,
diff --git a/src/tools/rust-analyzer/docs/book/README.md b/src/tools/rust-analyzer/docs/book/README.md
index 0a3161f3af38..cd4d8783a4d2 100644
--- a/src/tools/rust-analyzer/docs/book/README.md
+++ b/src/tools/rust-analyzer/docs/book/README.md
@@ -6,7 +6,7 @@ The rust analyzer manual uses [mdbook](https://rust-lang.github.io/mdBook/).
 
 To run the documentation site locally:
 
-```shell
+```bash
 cargo install mdbook
 cargo xtask codegen
 cd docs/book
diff --git a/src/tools/rust-analyzer/docs/book/src/contributing/README.md b/src/tools/rust-analyzer/docs/book/src/contributing/README.md
index c95a1dba6249..bb2b6081ad95 100644
--- a/src/tools/rust-analyzer/docs/book/src/contributing/README.md
+++ b/src/tools/rust-analyzer/docs/book/src/contributing/README.md
@@ -4,7 +4,7 @@ rust-analyzer is an ordinary Rust project, which is organized as a Cargo workspa
 So, just
 
 ```bash
-$ cargo test
+cargo test
 ```
 
 should be enough to get you started!
@@ -203,14 +203,14 @@ It is enabled by `RA_COUNT=1`.
 To measure time for from-scratch analysis, use something like this:
 
 ```bash
-$ cargo run --release -p rust-analyzer -- analysis-stats ../chalk/
+cargo run --release -p rust-analyzer -- analysis-stats ../chalk/
 ```
 
 For measuring time of incremental analysis, use either of these:
 
 ```bash
-$ cargo run --release -p rust-analyzer -- analysis-bench ../chalk/ --highlight ../chalk/chalk-engine/src/logic.rs
-$ cargo run --release -p rust-analyzer -- analysis-bench ../chalk/ --complete ../chalk/chalk-engine/src/logic.rs:94:0
+cargo run --release -p rust-analyzer -- analysis-bench ../chalk/ --highlight ../chalk/chalk-engine/src/logic.rs
+cargo run --release -p rust-analyzer -- analysis-bench ../chalk/ --complete ../chalk/chalk-engine/src/logic.rs:94:0
 ```
 
 Look for `fn benchmark_xxx` tests for a quick way to reproduce performance problems.
@@ -283,7 +283,8 @@ repository. We use the [rustc-josh-sync](https://github.com/rust-lang/josh-sync)
 repositories. You can find documentation of the tool [here](https://github.com/rust-lang/josh-sync).
 
 You can install the synchronization tool using the following commands:
-```
+
+```bash
 cargo install --locked --git https://github.com/rust-lang/josh-sync
 ```
 
diff --git a/src/tools/rust-analyzer/docs/book/src/contributing/debugging.md b/src/tools/rust-analyzer/docs/book/src/contributing/debugging.md
index fcda664f5ed3..ace9be025ab4 100644
--- a/src/tools/rust-analyzer/docs/book/src/contributing/debugging.md
+++ b/src/tools/rust-analyzer/docs/book/src/contributing/debugging.md
@@ -68,7 +68,7 @@ while d == 4 { // set a breakpoint here and change the value
 
 However for this to work, you will need to enable debug_assertions in your build
 
-```rust
+```bash
 RUSTFLAGS='--cfg debug_assertions' cargo build --release
 ```
 
diff --git a/src/tools/rust-analyzer/docs/book/src/installation.md b/src/tools/rust-analyzer/docs/book/src/installation.md
index 3a4c0cf22774..cc636c31e6ec 100644
--- a/src/tools/rust-analyzer/docs/book/src/installation.md
+++ b/src/tools/rust-analyzer/docs/book/src/installation.md
@@ -13,7 +13,9 @@ editor](./other_editors.html).
 rust-analyzer will attempt to install the standard library source code
 automatically. You can also install it manually with `rustup`.
 
-    $ rustup component add rust-src
+```bash
+rustup component add rust-src
+```
 
 Only the latest stable standard library source is officially supported
 for use with rust-analyzer. If you are using an older toolchain or have
diff --git a/src/tools/rust-analyzer/docs/book/src/rust_analyzer_binary.md b/src/tools/rust-analyzer/docs/book/src/rust_analyzer_binary.md
index c7ac3087ced7..2b62011a8e33 100644
--- a/src/tools/rust-analyzer/docs/book/src/rust_analyzer_binary.md
+++ b/src/tools/rust-analyzer/docs/book/src/rust_analyzer_binary.md
@@ -11,9 +11,11 @@ your `$PATH`.
 On Linux to install the `rust-analyzer` binary into `~/.local/bin`,
 these commands should work:
 
-    $ mkdir -p ~/.local/bin
-    $ curl -L https://github.com/rust-lang/rust-analyzer/releases/latest/download/rust-analyzer-x86_64-unknown-linux-gnu.gz | gunzip -c - > ~/.local/bin/rust-analyzer
-    $ chmod +x ~/.local/bin/rust-analyzer
+```bash
+mkdir -p ~/.local/bin
+curl -L https://github.com/rust-lang/rust-analyzer/releases/latest/download/rust-analyzer-x86_64-unknown-linux-gnu.gz | gunzip -c - > ~/.local/bin/rust-analyzer
+chmod +x ~/.local/bin/rust-analyzer
+```
 
 Make sure that `~/.local/bin` is listed in the `$PATH` variable and use
 the appropriate URL if you’re not on a `x86-64` system.
@@ -24,8 +26,10 @@ or `/usr/local/bin` will work just as well.
 Alternatively, you can install it from source using the command below.
 You’ll need the latest stable version of the Rust toolchain.
 
-    $ git clone https://github.com/rust-lang/rust-analyzer.git && cd rust-analyzer
-    $ cargo xtask install --server
+```bash
+git clone https://github.com/rust-lang/rust-analyzer.git && cd rust-analyzer
+cargo xtask install --server
+```
 
 If your editor can’t find the binary even though the binary is on your
 `$PATH`, the likely explanation is that it doesn’t see the same `$PATH`
@@ -38,7 +42,9 @@ the environment should help.
 
 `rust-analyzer` is available in `rustup`:
 
-    $ rustup component add rust-analyzer
+```bash
+rustup component add rust-analyzer
+```
 
 ### Arch Linux
 
@@ -53,7 +59,9 @@ User Repository):
 
 Install it with pacman, for example:
 
-    $ pacman -S rust-analyzer
+```bash
+pacman -S rust-analyzer
+```
 
 ### Gentoo Linux
 
@@ -64,7 +72,9 @@ Install it with pacman, for example:
 The `rust-analyzer` binary can be installed via
 [Homebrew](https://brew.sh/).
 
-    $ brew install rust-analyzer
+```bash
+brew install rust-analyzer
+```
 
 ### Windows
 
diff --git a/src/tools/rust-analyzer/docs/book/src/troubleshooting.md b/src/tools/rust-analyzer/docs/book/src/troubleshooting.md
index a357cbef415c..c315bfad7f94 100644
--- a/src/tools/rust-analyzer/docs/book/src/troubleshooting.md
+++ b/src/tools/rust-analyzer/docs/book/src/troubleshooting.md
@@ -37,13 +37,13 @@ bypassing LSP machinery.
 When filing issues, it is useful (but not necessary) to try to minimize
 examples. An ideal bug reproduction looks like this:
 
-```shell
-$ git clone https://github.com/username/repo.git && cd repo && git switch --detach commit-hash
-$ rust-analyzer --version
+```bash
+git clone https://github.com/username/repo.git && cd repo && git switch --detach commit-hash
+rust-analyzer --version
 rust-analyzer dd12184e4 2021-05-08 dev
-$ rust-analyzer analysis-stats .
-💀 💀 💀
+rust-analyzer analysis-stats .
 ```
+💀 💀 💀
 
 It is especially useful when the `repo` doesn’t use external crates or
 the standard library.
diff --git a/src/tools/rust-analyzer/docs/book/src/vs_code.md b/src/tools/rust-analyzer/docs/book/src/vs_code.md
index 233b862d2c6b..75f940e69a88 100644
--- a/src/tools/rust-analyzer/docs/book/src/vs_code.md
+++ b/src/tools/rust-analyzer/docs/book/src/vs_code.md
@@ -49,7 +49,9 @@ Alternatively, download a VSIX corresponding to your platform from the
 Install the extension with the `Extensions: Install from VSIX` command
 within VS Code, or from the command line via:
 
-    $ code --install-extension /path/to/rust-analyzer.vsix
+```bash
+code --install-extension /path/to/rust-analyzer.vsix
+```
 
 If you are running an unsupported platform, you can install
 `rust-analyzer-no-server.vsix` and compile or obtain a server binary.
@@ -64,8 +66,10 @@ example:
 
 Both the server and the Code plugin can be installed from source:
 
-    $ git clone https://github.com/rust-lang/rust-analyzer.git && cd rust-analyzer
-    $ cargo xtask install
+```bash
+git clone https://github.com/rust-lang/rust-analyzer.git && cd rust-analyzer
+cargo xtask install
+```
 
 You’ll need Cargo, nodejs (matching a supported version of VS Code) and
 npm for this.
@@ -76,7 +80,9 @@ Remote, instead you’ll need to install the `.vsix` manually.
 If you’re not using Code, you can compile and install only the LSP
 server:
 
-    $ cargo xtask install --server
+```bash
+cargo xtask install --server
+```
 
 Make sure that `.cargo/bin` is in `$PATH` and precedes paths where
 `rust-analyzer` may also be installed. Specifically, `rustup` includes a
@@ -118,4 +124,3 @@ steps might help:
 
 A C compiler should already be available via `org.freedesktop.Sdk`. Any
 other tools or libraries you will need to acquire from Flatpak.
-
diff --git a/src/tools/rust-analyzer/xtask/src/codegen/grammar/ast_src.rs b/src/tools/rust-analyzer/xtask/src/codegen/grammar/ast_src.rs
index b9f570fe0e32..205072a6ce0c 100644
--- a/src/tools/rust-analyzer/xtask/src/codegen/grammar/ast_src.rs
+++ b/src/tools/rust-analyzer/xtask/src/codegen/grammar/ast_src.rs
@@ -112,7 +112,7 @@ fn to_tokens(&self, tokens: &mut proc_macro2::TokenStream) {
 // keywords that are keywords only in specific parse contexts
 #[doc(alias = "WEAK_KEYWORDS")]
 const CONTEXTUAL_KEYWORDS: &[&str] =
-    &["macro_rules", "union", "default", "raw", "dyn", "auto", "yeet", "safe"];
+    &["macro_rules", "union", "default", "raw", "dyn", "auto", "yeet", "safe", "bikeshed"];
 // keywords we use for special macro expansions
 const CONTEXTUAL_BUILTIN_KEYWORDS: &[&str] = &[
     "asm",
diff --git a/tests/crashes/137190-2.rs b/tests/crashes/137190-2.rs
deleted file mode 100644
index 0c68b5aa4a51..000000000000
--- a/tests/crashes/137190-2.rs
+++ /dev/null
@@ -1,18 +0,0 @@
-//@ known-bug: #137190
-trait Supertrait<T> {
-    fn method(&self) {}
-}
-
-trait Trait<P>: Supertrait<()> {}
-
-impl<P> Trait<P> for () {}
-
-const fn upcast<P>(x: &dyn Trait<P>) -> &dyn Supertrait<()> {
-    x
-}
-
-const fn foo() -> &'static dyn Supertrait<()> {
-    upcast::<()>(&())
-}
-
-const _: &'static dyn Supertrait<()> = foo();
diff --git a/tests/crashes/137190-3.rs b/tests/crashes/137190-3.rs
deleted file mode 100644
index 88ae88e11bcd..000000000000
--- a/tests/crashes/137190-3.rs
+++ /dev/null
@@ -1,10 +0,0 @@
-//@ known-bug: #137190
-trait Supertrait {
-    fn method(&self) {}
-}
-
-trait Trait: Supertrait {}
-
-impl Trait for () {}
-
-const _: &dyn Supertrait = &() as &dyn Trait as &dyn Supertrait;
diff --git a/tests/crashes/137916.rs b/tests/crashes/137916.rs
deleted file mode 100644
index b25e7b200d95..000000000000
--- a/tests/crashes/137916.rs
+++ /dev/null
@@ -1,13 +0,0 @@
-//@ known-bug: #137916
-//@ edition: 2021
-use std::ptr::null;
-
-async fn a() -> Box<dyn Send> {
-    Box::new(async {
-        let non_send = null::<()>();
-        &non_send;
-        async {}.await
-    })
-}
-
-fn main() {}
diff --git a/tests/crashes/138274.rs b/tests/crashes/138274.rs
deleted file mode 100644
index d657b27e46f3..000000000000
--- a/tests/crashes/138274.rs
+++ /dev/null
@@ -1,18 +0,0 @@
-//@ known-bug: #138274
-//@ edition: 2021
-//@ compile-flags: --crate-type=lib
-trait Trait {}
-
-fn foo() -> Box<dyn Trait> {
-    todo!()
-}
-
-fn fetch() {
-    async {
-        let fut = async {
-            let _x = foo();
-            async {}.await;
-        };
-        let _: Box<dyn Send> = Box::new(fut);
-    };
-}
diff --git a/tests/run-make/wasm-emscripten-cdylib/foo.rs b/tests/run-make/wasm-emscripten-cdylib/foo.rs
new file mode 100644
index 000000000000..08ad8e7b5c61
--- /dev/null
+++ b/tests/run-make/wasm-emscripten-cdylib/foo.rs
@@ -0,0 +1,4 @@
+#[no_mangle]
+pub extern "C" fn foo() -> i32 {
+    42
+}
diff --git a/tests/run-make/wasm-emscripten-cdylib/rmake.rs b/tests/run-make/wasm-emscripten-cdylib/rmake.rs
new file mode 100644
index 000000000000..ef5fc17c2bbe
--- /dev/null
+++ b/tests/run-make/wasm-emscripten-cdylib/rmake.rs
@@ -0,0 +1,25 @@
+//! Check that cdylib crate type is supported for the wasm32-unknown-emscripten
+//! target and produces a valid Emscripten dynamic library.
+
+//@ only-wasm32-unknown-emscripten
+
+use run_make_support::{bare_rustc, rfs, wasmparser};
+
+fn main() {
+    bare_rustc().input("foo.rs").target("wasm32-unknown-emscripten").crate_type("cdylib").run();
+
+    // Verify the output is a valid wasm file with a dylink.0 section
+    let file = rfs::read("foo.wasm");
+    let mut has_dylink = false;
+
+    for payload in wasmparser::Parser::new(0).parse_all(&file) {
+        let payload = payload.unwrap();
+        if let wasmparser::Payload::CustomSection(s) = payload {
+            if s.name() == "dylink.0" {
+                has_dylink = true;
+            }
+        }
+    }
+
+    assert!(has_dylink, "expected dylink.0 section in emscripten cdylib output");
+}
diff --git a/tests/ui/async-await/issue-70818.rs b/tests/ui/async-await/issue-70818.rs
index c11332fe7d84..af9f33d9050b 100644
--- a/tests/ui/async-await/issue-70818.rs
+++ b/tests/ui/async-await/issue-70818.rs
@@ -2,9 +2,8 @@
 
 use std::future::Future;
 fn foo<T: Send, U>(ty: T, ty1: U) -> impl Future<Output = (T, U)> + Send {
-    //~^ ERROR future cannot be sent between threads safely
+    //~^ ERROR: future cannot be sent between threads safely
     async { (ty, ty1) }
-    //~^ ERROR future cannot be sent between threads safely
 }
 
 fn main() {}
diff --git a/tests/ui/async-await/issue-70818.stderr b/tests/ui/async-await/issue-70818.stderr
index 07fd20cdd77e..8de6a825042b 100644
--- a/tests/ui/async-await/issue-70818.stderr
+++ b/tests/ui/async-await/issue-70818.stderr
@@ -1,24 +1,3 @@
-error: future cannot be sent between threads safely
-  --> $DIR/issue-70818.rs:6:5
-   |
-LL |     async { (ty, ty1) }
-   |     ^^^^^^^^^^^^^^^^^^^ future created by async block is not `Send`
-   |
-note: captured value is not `Send`
-  --> $DIR/issue-70818.rs:6:18
-   |
-LL |     async { (ty, ty1) }
-   |                  ^^^ has type `U` which is not `Send`
-note: required by a bound in an opaque type
-  --> $DIR/issue-70818.rs:4:69
-   |
-LL | fn foo<T: Send, U>(ty: T, ty1: U) -> impl Future<Output = (T, U)> + Send {
-   |                                                                     ^^^^
-help: consider restricting type parameter `U` with trait `Send`
-   |
-LL | fn foo<T: Send, U: std::marker::Send>(ty: T, ty1: U) -> impl Future<Output = (T, U)> + Send {
-   |                  +++++++++++++++++++
-
 error: future cannot be sent between threads safely
   --> $DIR/issue-70818.rs:4:38
    |
@@ -35,5 +14,5 @@ help: consider restricting type parameter `U` with trait `Send`
 LL | fn foo<T: Send, U: std::marker::Send>(ty: T, ty1: U) -> impl Future<Output = (T, U)> + Send {
    |                  +++++++++++++++++++
 
-error: aborting due to 2 previous errors
+error: aborting due to 1 previous error
 
diff --git a/tests/ui/async-await/issue-70935-complex-spans.rs b/tests/ui/async-await/issue-70935-complex-spans.rs
index 2851637ae78f..27826f79dcd9 100644
--- a/tests/ui/async-await/issue-70935-complex-spans.rs
+++ b/tests/ui/async-await/issue-70935-complex-spans.rs
@@ -15,7 +15,6 @@ async fn baz<T>(_c: impl FnMut() -> T) where T: Future<Output=()> {
 fn foo(x: NotSync) -> impl Future + Send {
     //~^ ERROR `*mut ()` cannot be shared between threads safely
     async move {
-    //~^ ERROR `*mut ()` cannot be shared between threads safely
         baz(|| async {
             foo(x.clone());
         }).await;
diff --git a/tests/ui/async-await/issue-70935-complex-spans.stderr b/tests/ui/async-await/issue-70935-complex-spans.stderr
index 31d15c459217..b9180c620b0d 100644
--- a/tests/ui/async-await/issue-70935-complex-spans.stderr
+++ b/tests/ui/async-await/issue-70935-complex-spans.stderr
@@ -1,46 +1,3 @@
-error[E0277]: `*mut ()` cannot be shared between threads safely
-  --> $DIR/issue-70935-complex-spans.rs:17:5
-   |
-LL | /     async move {
-LL | |
-LL | |         baz(|| async {
-LL | |             foo(x.clone());
-LL | |         }).await;
-LL | |     }
-   | |_____^ `*mut ()` cannot be shared between threads safely
-   |
-   = help: within `NotSync`, the trait `Sync` is not implemented for `*mut ()`
-note: required because it appears within the type `PhantomData<*mut ()>`
-  --> $SRC_DIR/core/src/marker.rs:LL:COL
-note: required because it appears within the type `NotSync`
-  --> $DIR/issue-70935-complex-spans.rs:9:8
-   |
-LL | struct NotSync(PhantomData<*mut ()>);
-   |        ^^^^^^^
-   = note: required for `&NotSync` to implement `Send`
-note: required because it's used within this closure
-  --> $DIR/issue-70935-complex-spans.rs:19:13
-   |
-LL |         baz(|| async {
-   |             ^^
-note: required because it's used within this `async` fn body
-  --> $DIR/issue-70935-complex-spans.rs:12:67
-   |
-LL |   async fn baz<T>(_c: impl FnMut() -> T) where T: Future<Output=()> {
-   |  ___________________________________________________________________^
-LL | | }
-   | |_^
-note: required because it's used within this `async` block
-  --> $DIR/issue-70935-complex-spans.rs:17:5
-   |
-LL |     async move {
-   |     ^^^^^^^^^^
-note: required by a bound in an opaque type
-  --> $DIR/issue-70935-complex-spans.rs:15:37
-   |
-LL | fn foo(x: NotSync) -> impl Future + Send {
-   |                                     ^^^^
-
 error[E0277]: `*mut ()` cannot be shared between threads safely
   --> $DIR/issue-70935-complex-spans.rs:15:23
    |
@@ -57,7 +14,7 @@ LL | struct NotSync(PhantomData<*mut ()>);
    |        ^^^^^^^
    = note: required for `&NotSync` to implement `Send`
 note: required because it's used within this closure
-  --> $DIR/issue-70935-complex-spans.rs:19:13
+  --> $DIR/issue-70935-complex-spans.rs:18:13
    |
 LL |         baz(|| async {
    |             ^^
@@ -74,6 +31,6 @@ note: required because it's used within this `async` block
 LL |     async move {
    |     ^^^^^^^^^^
 
-error: aborting due to 2 previous errors
+error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/crashes/135470.rs b/tests/ui/coercion/vtable-impossible-predicates-async.rs
similarity index 79%
rename from tests/crashes/135470.rs
rename to tests/ui/coercion/vtable-impossible-predicates-async.rs
index efa017b5457c..fe6aa9843fc6 100644
--- a/tests/crashes/135470.rs
+++ b/tests/ui/coercion/vtable-impossible-predicates-async.rs
@@ -1,4 +1,8 @@
-//@ known-bug: #135470
+// Regression test for #135470.
+// Verify that we don't ICE when building vtable entries
+// for a blanket impl involving async and impossible predicates.
+
+//@ check-pass
 //@ compile-flags: -Copt-level=0
 //@ edition: 2021
 
diff --git a/tests/ui/coercion/vtable-unsatisfied-supertrait-generics.rs b/tests/ui/coercion/vtable-unsatisfied-supertrait-generics.rs
new file mode 100644
index 000000000000..41e603fc0a0a
--- /dev/null
+++ b/tests/ui/coercion/vtable-unsatisfied-supertrait-generics.rs
@@ -0,0 +1,25 @@
+// Regression test for #137190.
+// Variant of vtable-unsatisfied-supertrait.rs with generic traits.
+// Verify that we don't ICE when building vtable entries
+// for a generic trait whose supertrait is not implemented.
+
+//@ compile-flags: --crate-type lib
+
+trait Supertrait<T> {
+    fn method(&self) {}
+}
+
+trait Trait<P>: Supertrait<()> {}
+
+impl<P> Trait<P> for () {}
+//~^ ERROR the trait bound `(): Supertrait<()>` is not satisfied
+
+const fn upcast<P>(x: &dyn Trait<P>) -> &dyn Supertrait<()> {
+    x
+}
+
+const fn foo() -> &'static dyn Supertrait<()> {
+    upcast::<()>(&())
+}
+
+const _: &'static dyn Supertrait<()> = foo();
diff --git a/tests/ui/coercion/vtable-unsatisfied-supertrait-generics.stderr b/tests/ui/coercion/vtable-unsatisfied-supertrait-generics.stderr
new file mode 100644
index 000000000000..a485d2d53953
--- /dev/null
+++ b/tests/ui/coercion/vtable-unsatisfied-supertrait-generics.stderr
@@ -0,0 +1,20 @@
+error[E0277]: the trait bound `(): Supertrait<()>` is not satisfied
+  --> $DIR/vtable-unsatisfied-supertrait-generics.rs:14:22
+   |
+LL | impl<P> Trait<P> for () {}
+   |                      ^^ the trait `Supertrait<()>` is not implemented for `()`
+   |
+help: this trait has no implementations, consider adding one
+  --> $DIR/vtable-unsatisfied-supertrait-generics.rs:8:1
+   |
+LL | trait Supertrait<T> {
+   | ^^^^^^^^^^^^^^^^^^^
+note: required by a bound in `Trait`
+  --> $DIR/vtable-unsatisfied-supertrait-generics.rs:12:17
+   |
+LL | trait Trait<P>: Supertrait<()> {}
+   |                 ^^^^^^^^^^^^^^ required by this bound in `Trait`
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/coercion/vtable-unsatisfied-supertrait.rs b/tests/ui/coercion/vtable-unsatisfied-supertrait.rs
new file mode 100644
index 000000000000..26a83d2fb066
--- /dev/null
+++ b/tests/ui/coercion/vtable-unsatisfied-supertrait.rs
@@ -0,0 +1,16 @@
+// Regression test for #137190.
+// Verify that we don't ICE when building vtable entries
+// for a trait whose supertrait is not implemented.
+
+//@ compile-flags: --crate-type lib
+
+trait Supertrait {
+    fn method(&self) {}
+}
+
+trait Trait: Supertrait {}
+
+impl Trait for () {}
+//~^ ERROR the trait bound `(): Supertrait` is not satisfied
+
+const _: &dyn Supertrait = &() as &dyn Trait as &dyn Supertrait;
diff --git a/tests/ui/coercion/vtable-unsatisfied-supertrait.stderr b/tests/ui/coercion/vtable-unsatisfied-supertrait.stderr
new file mode 100644
index 000000000000..7df2c95c7fac
--- /dev/null
+++ b/tests/ui/coercion/vtable-unsatisfied-supertrait.stderr
@@ -0,0 +1,20 @@
+error[E0277]: the trait bound `(): Supertrait` is not satisfied
+  --> $DIR/vtable-unsatisfied-supertrait.rs:13:16
+   |
+LL | impl Trait for () {}
+   |                ^^ the trait `Supertrait` is not implemented for `()`
+   |
+help: this trait has no implementations, consider adding one
+  --> $DIR/vtable-unsatisfied-supertrait.rs:7:1
+   |
+LL | trait Supertrait {
+   | ^^^^^^^^^^^^^^^^
+note: required by a bound in `Trait`
+  --> $DIR/vtable-unsatisfied-supertrait.rs:11:14
+   |
+LL | trait Trait: Supertrait {}
+   |              ^^^^^^^^^^ required by this bound in `Trait`
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/coroutine/issue-105084.rs b/tests/ui/coroutine/issue-105084.rs
index cddee4990175..4e9f6ee3a595 100644
--- a/tests/ui/coroutine/issue-105084.rs
+++ b/tests/ui/coroutine/issue-105084.rs
@@ -36,7 +36,6 @@ fn main() {
     // one inside `g` and one inside `h`.
     // Proceed and drop `t` in `g`.
     Pin::new(&mut g).resume(());
-    //~^ ERROR borrow of moved value: `g`
 
     // Proceed and drop `t` in `h` -> double free!
     Pin::new(&mut h).resume(());
diff --git a/tests/ui/coroutine/issue-105084.stderr b/tests/ui/coroutine/issue-105084.stderr
index 23c1fdc54592..a69d20e607a4 100644
--- a/tests/ui/coroutine/issue-105084.stderr
+++ b/tests/ui/coroutine/issue-105084.stderr
@@ -1,27 +1,3 @@
-error[E0382]: borrow of moved value: `g`
-  --> $DIR/issue-105084.rs:38:14
-   |
-LL |     let mut g = #[coroutine]
-   |         ----- move occurs because `g` has type `{coroutine@$DIR/issue-105084.rs:16:5: 16:7}`, which does not implement the `Copy` trait
-...
-LL |     let mut h = copy(g);
-   |                      - value moved here
-...
-LL |     Pin::new(&mut g).resume(());
-   |              ^^^^^^ value borrowed here after move
-   |
-note: consider changing this parameter type in function `copy` to borrow instead if owning the value isn't necessary
-  --> $DIR/issue-105084.rs:10:21
-   |
-LL | fn copy<T: Copy>(x: T) -> T {
-   |    ----             ^ this parameter takes ownership of the value
-   |    |
-   |    in this function
-help: consider cloning the value if the performance cost is acceptable
-   |
-LL |     let mut h = copy(g.clone());
-   |                       ++++++++
-
 error[E0277]: the trait bound `Box<(i32, ())>: Copy` is not satisfied in `{coroutine@$DIR/issue-105084.rs:16:5: 16:7}`
   --> $DIR/issue-105084.rs:32:17
    |
@@ -45,7 +21,6 @@ note: required by a bound in `copy`
 LL | fn copy<T: Copy>(x: T) -> T {
    |            ^^^^ required by this bound in `copy`
 
-error: aborting due to 2 previous errors
+error: aborting due to 1 previous error
 
-Some errors have detailed explanations: E0277, E0382.
-For more information about an error, try `rustc --explain E0277`.
+For more information about this error, try `rustc --explain E0277`.
diff --git a/tests/ui/coroutine/stalled-coroutine-obligations.rs b/tests/ui/coroutine/stalled-coroutine-obligations.rs
new file mode 100644
index 000000000000..89af3c9a583c
--- /dev/null
+++ b/tests/ui/coroutine/stalled-coroutine-obligations.rs
@@ -0,0 +1,32 @@
+//@ edition: 2021
+
+// Regression tests for #137916 and #138274
+// We now check stalled coroutine obligations eagerly at the start of `mir_borrowck`.
+// So these unsatisfied bounds are caught before causing ICEs.
+use std::ptr::null;
+
+async fn a() -> Box<dyn Send> {
+    Box::new(async {
+        //~^ ERROR: future cannot be sent between threads safely
+        let non_send = null::<()>();
+        &non_send;
+        async {}.await
+    })
+}
+
+
+trait Trait {}
+fn foo() -> Box<dyn Trait> { todo!() }
+
+fn fetch() {
+    async {
+        let fut = async {
+            let _x = foo();
+            async {}.await;
+        };
+        let _: Box<dyn Send> = Box::new(fut);
+        //~^ ERROR: future cannot be sent between threads safely
+    };
+}
+
+fn main() {}
diff --git a/tests/ui/coroutine/stalled-coroutine-obligations.stderr b/tests/ui/coroutine/stalled-coroutine-obligations.stderr
new file mode 100644
index 000000000000..cbf395dd6cfb
--- /dev/null
+++ b/tests/ui/coroutine/stalled-coroutine-obligations.stderr
@@ -0,0 +1,40 @@
+error: future cannot be sent between threads safely
+  --> $DIR/stalled-coroutine-obligations.rs:9:5
+   |
+LL | /     Box::new(async {
+LL | |
+LL | |         let non_send = null::<()>();
+LL | |         &non_send;
+LL | |         async {}.await
+LL | |     })
+   | |______^ future created by async block is not `Send`
+   |
+   = help: within `{async block@$DIR/stalled-coroutine-obligations.rs:9:14: 9:19}`, the trait `Send` is not implemented for `*const ()`
+note: future is not `Send` as this value is used across an await
+  --> $DIR/stalled-coroutine-obligations.rs:13:18
+   |
+LL |         let non_send = null::<()>();
+   |             -------- has type `*const ()` which is not `Send`
+LL |         &non_send;
+LL |         async {}.await
+   |                  ^^^^^ await occurs here, with `non_send` maybe used later
+   = note: required for the cast from `Box<{async block@$DIR/stalled-coroutine-obligations.rs:9:14: 9:19}>` to `Box<dyn Send>`
+
+error: future cannot be sent between threads safely
+  --> $DIR/stalled-coroutine-obligations.rs:27:32
+   |
+LL |         let _: Box<dyn Send> = Box::new(fut);
+   |                                ^^^^^^^^^^^^^ future created by async block is not `Send`
+   |
+   = help: the trait `Send` is not implemented for `dyn Trait`
+note: future is not `Send` as this value is used across an await
+  --> $DIR/stalled-coroutine-obligations.rs:25:22
+   |
+LL |             let _x = foo();
+   |                 -- has type `Box<dyn Trait>` which is not `Send`
+LL |             async {}.await;
+   |                      ^^^^^ await occurs here, with `_x` maybe used later
+   = note: required for the cast from `Box<{async block@$DIR/stalled-coroutine-obligations.rs:23:19: 23:24}>` to `Box<dyn Send>`
+
+error: aborting due to 2 previous errors
+
diff --git a/tests/ui/suggestions/issue-71394-no-from-impl.stderr b/tests/ui/suggestions/issue-71394-no-from-impl.stderr
index 9e068c311ae0..b8a240f7f07c 100644
--- a/tests/ui/suggestions/issue-71394-no-from-impl.stderr
+++ b/tests/ui/suggestions/issue-71394-no-from-impl.stderr
@@ -13,7 +13,7 @@ LL |     let _: &[i8] = data.into();
              `[T; 6]` implements `From<(T, T, T, T, T, T)>`
              `[T; 7]` implements `From<(T, T, T, T, T, T, T)>`
              `[T; 8]` implements `From<(T, T, T, T, T, T, T, T)>`
-           and 6 others
+           and 7 others
    = note: required for `&[u8]` to implement `Into<&[i8]>`
 
 error: aborting due to 1 previous error
diff --git a/tests/ui/traits/next-solver/stalled-coroutine-obligations.rs b/tests/ui/traits/next-solver/stalled-coroutine-obligations.rs
new file mode 100644
index 000000000000..7c789af9e4cc
--- /dev/null
+++ b/tests/ui/traits/next-solver/stalled-coroutine-obligations.rs
@@ -0,0 +1,50 @@
+//@ edition: 2024
+//@ compile-flags: -Znext-solver --diagnostic-width=300
+
+// Previously we check stalled coroutine obligations after borrowck pass.
+// And we wrongly assume that these obligations hold in borrowck which leads to
+// silent normalization failures.
+// In the next solver, we register opaques types via `NormalizesTo` goals.
+// So these failures also cause those opaques types not registered in storage.
+//
+// Regression test for #151322 and #151323.
+
+#![feature(type_alias_impl_trait)]
+#![feature(negative_impls)]
+#![feature(auto_traits)]
+
+fn stalled_copy_clone() {
+    type T = impl Copy;
+    let foo: T = async {};
+    //~^ ERROR: the trait bound
+
+    type U = impl Clone;
+    let bar: U = async {};
+    //~^ ERROR: the trait bound
+}
+
+auto trait Valid {}
+struct False;
+impl !Valid for False {}
+
+fn stalled_auto_traits() {
+    type T = impl Valid;
+    let a = False;
+    let foo: T = async { a };
+    //~^ ERROR: the trait bound `False: Valid` is not satisfied
+}
+
+
+trait Trait {
+    fn stalled_send(&self, b: *mut ()) -> impl Future + Send {
+    //~^ ERROR: type mismatch resolving
+    //~| ERROR: type mismatch resolving
+        async move {
+            //~^ ERROR: type mismatch resolving
+            b
+        }
+    }
+}
+
+
+fn main() {}
diff --git a/tests/ui/traits/next-solver/stalled-coroutine-obligations.stderr b/tests/ui/traits/next-solver/stalled-coroutine-obligations.stderr
new file mode 100644
index 000000000000..6afa406bf367
--- /dev/null
+++ b/tests/ui/traits/next-solver/stalled-coroutine-obligations.stderr
@@ -0,0 +1,62 @@
+error[E0277]: the trait bound `{async block@$DIR/stalled-coroutine-obligations.rs:18:18: 18:23}: Copy` is not satisfied
+  --> $DIR/stalled-coroutine-obligations.rs:18:14
+   |
+LL |     let foo: T = async {};
+   |              ^ the trait `Copy` is not implemented for `{async block@$DIR/stalled-coroutine-obligations.rs:18:18: 18:23}`
+
+error[E0277]: the trait bound `{async block@$DIR/stalled-coroutine-obligations.rs:22:18: 22:23}: Clone` is not satisfied
+  --> $DIR/stalled-coroutine-obligations.rs:22:14
+   |
+LL |     let bar: U = async {};
+   |              ^ the trait `Clone` is not implemented for `{async block@$DIR/stalled-coroutine-obligations.rs:22:18: 22:23}`
+
+error[E0277]: the trait bound `False: Valid` is not satisfied in `{async block@$DIR/stalled-coroutine-obligations.rs:33:18: 33:23}`
+  --> $DIR/stalled-coroutine-obligations.rs:33:14
+   |
+LL |     let foo: T = async { a };
+   |              ^   ----- within this `{async block@$DIR/stalled-coroutine-obligations.rs:33:18: 33:23}`
+   |              |
+   |              unsatisfied trait bound
+   |
+help: within `{async block@$DIR/stalled-coroutine-obligations.rs:33:18: 33:23}`, the trait `Valid` is not implemented for `False`
+  --> $DIR/stalled-coroutine-obligations.rs:27:1
+   |
+LL | struct False;
+   | ^^^^^^^^^^^^
+note: captured value does not implement `Valid`
+  --> $DIR/stalled-coroutine-obligations.rs:33:26
+   |
+LL |     let foo: T = async { a };
+   |                          ^ has type `False` which does not implement `Valid`
+
+error[E0271]: type mismatch resolving `impl Future + Send == {async block@$DIR/stalled-coroutine-obligations.rs:42:9: 42:19}`
+  --> $DIR/stalled-coroutine-obligations.rs:39:5
+   |
+LL |     fn stalled_send(&self, b: *mut ()) -> impl Future + Send {
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ types differ
+
+error[E0271]: type mismatch resolving `impl Future + Send == {async block@$DIR/stalled-coroutine-obligations.rs:42:9: 42:19}`
+  --> $DIR/stalled-coroutine-obligations.rs:42:9
+   |
+LL | /         async move {
+LL | |
+LL | |             b
+LL | |         }
+   | |_________^ types differ
+
+error[E0271]: type mismatch resolving `{async block@$DIR/stalled-coroutine-obligations.rs:42:9: 42:19} <: impl Future + Send`
+  --> $DIR/stalled-coroutine-obligations.rs:39:62
+   |
+LL |       fn stalled_send(&self, b: *mut ()) -> impl Future + Send {
+   |  ______________________________________________________________^
+LL | |
+LL | |
+LL | |         async move {
+...  |
+LL | |     }
+   | |_____^ types differ
+
+error: aborting due to 6 previous errors
+
+Some errors have detailed explanations: E0271, E0277.
+For more information about an error, try `rustc --explain E0271`.