Add MSRV check for manual_noop_waker

book/src/lint_configuration.md

@@ -928,6 +928,7 @@ The minimum rust version that the project supports. Defaults to the `rust-versio
 * [`manual_let_else`](https://rust-lang.github.io/rust-clippy/master/index.html#manual_let_else)
 * [`manual_midpoint`](https://rust-lang.github.io/rust-clippy/master/index.html#manual_midpoint)
 * [`manual_non_exhaustive`](https://rust-lang.github.io/rust-clippy/master/index.html#manual_non_exhaustive)
+* [`manual_noop_waker`](https://rust-lang.github.io/rust-clippy/master/index.html#manual_noop_waker)
 * [`manual_option_as_slice`](https://rust-lang.github.io/rust-clippy/master/index.html#manual_option_as_slice)
 * [`manual_pattern_char_comparison`](https://rust-lang.github.io/rust-clippy/master/index.html#manual_pattern_char_comparison)
 * [`manual_range_contains`](https://rust-lang.github.io/rust-clippy/master/index.html#manual_range_contains)

clippy_config/src/conf.rs

@@ -789,6 +789,7 @@ fn span_from_toml_range(file: &SourceFile, span: Range<usize>) -> Span {
         manual_let_else,
         manual_midpoint,
         manual_non_exhaustive,
+        manual_noop_waker,
         manual_option_as_slice,
         manual_pattern_char_comparison,
         manual_range_contains,

clippy_lints/src/lib.rs

@@ -866,7 +866,7 @@ pub fn register_lint_passes(store: &mut rustc_lint::LintStore, conf: &'static Co
         Box::new(move |_| Box::new(manual_take::ManualTake::new(conf))),
         Box::new(|_| Box::new(manual_checked_ops::ManualCheckedOps)),
         Box::new(move |tcx| Box::new(manual_pop_if::ManualPopIf::new(tcx, conf))),
-        Box::new(|_| Box::new(manual_noop_waker::ManualNoopWaker)),
+        Box::new(move |_| Box::new(manual_noop_waker::ManualNoopWaker::new(conf))),
         // add late passes here, used by `cargo dev new_lint`
     ];
     store.late_passes.extend(late_lints);

clippy_lints/src/manual_noop_waker.rs

@@ -1,8 +1,10 @@
+use clippy_config::Conf;
 use clippy_utils::diagnostics::span_lint_and_help;
+use clippy_utils::msrvs::{self, Msrv};
 use clippy_utils::{is_empty_block, sym};
 use rustc_hir::{ImplItemKind, Item, ItemKind};
 use rustc_lint::{LateContext, LateLintPass};
-use rustc_session::declare_lint_pass;
+use rustc_session::impl_lint_pass;
 
 declare_clippy_lint! {
     /// ### What it does
@@ -35,7 +37,17 @@
     "manual implementations of noop wakers can be simplified using Waker::noop()"
 }
 
-declare_lint_pass!(ManualNoopWaker => [MANUAL_NOOP_WAKER]);
+impl_lint_pass!(ManualNoopWaker => [MANUAL_NOOP_WAKER]);
+
+pub struct ManualNoopWaker {
+    msrv: Msrv,
+}
+
+impl ManualNoopWaker {
+    pub fn new(conf: &'static Conf) -> Self {
+        Self { msrv: conf.msrv }
+    }
+}
 
 impl<'tcx> LateLintPass<'tcx> for ManualNoopWaker {
     fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'tcx>) {
@@ -43,6 +55,7 @@ fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'tcx>) {
             && let Some(trait_ref) = imp.of_trait
             && let Some(trait_id) = trait_ref.trait_ref.trait_def_id()
             && cx.tcx.is_diagnostic_item(sym::Wake, trait_id)
+            && self.msrv.meets(cx, msrvs::WAKER_NOOP)
         {
             for impl_item_ref in imp.items {
                 let impl_item = cx

clippy_utils/src/msrvs.rs

@@ -28,7 +28,7 @@ macro_rules! msrv_aliases {
     1,88,0 { LET_CHAINS }
     1,87,0 { OS_STR_DISPLAY, INT_MIDPOINT, CONST_CHAR_IS_DIGIT, UNSIGNED_IS_MULTIPLE_OF, INTEGER_SIGN_CAST }
     1,86,0 { VEC_POP_IF }
-    1,85,0 { UINT_FLOAT_MIDPOINT, CONST_SIZE_OF_VAL }
+    1,85,0 { UINT_FLOAT_MIDPOINT, CONST_SIZE_OF_VAL, WAKER_NOOP }
     1,84,0 { CONST_OPTION_AS_SLICE, MANUAL_DANGLING_PTR }
     1,83,0 { CONST_EXTERN_FN, CONST_FLOAT_BITS_CONV, CONST_FLOAT_CLASSIFY, CONST_MUT_REFS, CONST_UNWRAP }
     1,82,0 { IS_NONE_OR, REPEAT_N, RAW_REF_OP, SPECIALIZED_TO_STRING_FOR_REFS }

tests/ui/manual_noop_waker.rs

@@ -38,3 +38,28 @@ fn wake(self: Arc<Self>) {}
         fn wake_by_ref(self: &Arc<Self>) {}
     }
 }
+
+#[clippy::msrv = "1.84"]
+mod msrv_1_84 {
+    use std::sync::Arc;
+    use std::task::Wake;
+
+    struct CustomWaker;
+    impl Wake for CustomWaker {
+        fn wake(self: Arc<Self>) {}
+        fn wake_by_ref(self: &Arc<Self>) {}
+    }
+}
+
+#[clippy::msrv = "1.85"]
+mod msrv_1_85 {
+    use std::sync::Arc;
+    use std::task::Wake;
+
+    struct CustomWaker;
+    impl Wake for CustomWaker {
+        //~^ manual_noop_waker
+        fn wake(self: Arc<Self>) {}
+        fn wake_by_ref(self: &Arc<Self>) {}
+    }
+}

tests/ui/manual_noop_waker.stderr

@@ -16,5 +16,13 @@ LL | impl Wake for MyWakerPartial {
    |
    = help: use `std::task::Waker::noop()` instead
 
-error: aborting due to 2 previous errors
+error: manual implementation of a no-op waker
+  --> tests/ui/manual_noop_waker.rs:60:10
+   |
+LL |     impl Wake for CustomWaker {
+   |          ^^^^
+   |
+   = help: use `std::task::Waker::noop()` instead
+
+error: aborting due to 3 previous errors