remove borrowck handling for inline const patterns

compiler/rustc_borrowck/src/type_check/mod.rs

@@ -19,6 +19,7 @@
     BoundRegionConversionTime, InferCtxt, NllRegionVariableOrigin, RegionVariableOrigin,
 };
 use rustc_infer::traits::PredicateObligations;
+use rustc_middle::bug;
 use rustc_middle::mir::visit::{NonMutatingUseContext, PlaceContext, Visitor};
 use rustc_middle::mir::*;
 use rustc_middle::traits::query::NoSolution;
@@ -28,7 +29,6 @@
     self, CanonicalUserTypeAnnotation, CanonicalUserTypeAnnotations, CoroutineArgsExt,
     GenericArgsRef, Ty, TyCtxt, TypeVisitableExt, UserArgs, UserTypeAnnotationIndex, fold_regions,
 };
-use rustc_middle::{bug, span_bug};
 use rustc_mir_dataflow::move_paths::MoveData;
 use rustc_mir_dataflow::points::DenseLocationMap;
 use rustc_span::def_id::CRATE_DEF_ID;
@@ -387,18 +387,10 @@ fn unsized_feature_enabled(&self) -> bool {
     #[instrument(skip(self), level = "debug")]
     fn check_user_type_annotations(&mut self) {
         debug!(?self.user_type_annotations);
-        let tcx = self.tcx();
         for user_annotation in self.user_type_annotations {
             let CanonicalUserTypeAnnotation { span, ref user_ty, inferred_ty } = *user_annotation;
             let annotation = self.instantiate_canonical(span, user_ty);
-            if let ty::UserTypeKind::TypeOf(def, args) = annotation.kind
-                && let DefKind::InlineConst = tcx.def_kind(def)
-            {
-                assert!(annotation.bounds.is_empty());
-                self.check_inline_const(inferred_ty, def.expect_local(), args, span);
-            } else {
-                self.ascribe_user_type(inferred_ty, annotation, span);
-            }
+            self.ascribe_user_type(inferred_ty, annotation, span);
         }
     }
 
@@ -560,36 +552,6 @@ fn check_promoted(&mut self, promoted_body: &'a Body<'tcx>, location: Location)
             self.constraints.liveness_constraints.add_location(region, location);
         }
     }
-
-    fn check_inline_const(
-        &mut self,
-        inferred_ty: Ty<'tcx>,
-        def_id: LocalDefId,
-        args: UserArgs<'tcx>,
-        span: Span,
-    ) {
-        assert!(args.user_self_ty.is_none());
-        let tcx = self.tcx();
-        let const_ty = tcx.type_of(def_id).instantiate(tcx, args.args);
-        if let Err(terr) =
-            self.eq_types(const_ty, inferred_ty, Locations::All(span), ConstraintCategory::Boring)
-        {
-            span_bug!(
-                span,
-                "bad inline const pattern: ({:?} = {:?}) {:?}",
-                const_ty,
-                inferred_ty,
-                terr
-            );
-        }
-        let args = self.infcx.resolve_vars_if_possible(args.args);
-        let predicates = self.prove_closure_bounds(tcx, def_id, args, Locations::All(span));
-        self.normalize_and_prove_instantiated_predicates(
-            def_id.to_def_id(),
-            predicates,
-            Locations::All(span),
-        );
-    }
 }
 
 impl<'a, 'tcx> Visitor<'tcx> for TypeChecker<'a, 'tcx> {
@@ -1731,12 +1693,7 @@ fn visit_operand(&mut self, op: &Operand<'tcx>, location: Location) {
                     let def_id = uv.def;
                     if tcx.def_kind(def_id) == DefKind::InlineConst {
                         let def_id = def_id.expect_local();
-                        let predicates = self.prove_closure_bounds(
-                            tcx,
-                            def_id,
-                            uv.args,
-                            location.to_locations(),
-                        );
+                        let predicates = self.prove_closure_bounds(tcx, def_id, uv.args, location);
                         self.normalize_and_prove_instantiated_predicates(
                             def_id.to_def_id(),
                             predicates,
@@ -2519,15 +2476,9 @@ fn prove_aggregate_predicates(
             // clauses on the struct.
             AggregateKind::Closure(def_id, args)
             | AggregateKind::CoroutineClosure(def_id, args)
-            | AggregateKind::Coroutine(def_id, args) => (
-                def_id,
-                self.prove_closure_bounds(
-                    tcx,
-                    def_id.expect_local(),
-                    args,
-                    location.to_locations(),
-                ),
-            ),
+            | AggregateKind::Coroutine(def_id, args) => {
+                (def_id, self.prove_closure_bounds(tcx, def_id.expect_local(), args, location))
+            }
 
             AggregateKind::Array(_) | AggregateKind::Tuple | AggregateKind::RawPtr(..) => {
                 (CRATE_DEF_ID.to_def_id(), ty::InstantiatedPredicates::empty())
@@ -2546,12 +2497,12 @@ fn prove_closure_bounds(
         tcx: TyCtxt<'tcx>,
         def_id: LocalDefId,
         args: GenericArgsRef<'tcx>,
-        locations: Locations,
+        location: Location,
     ) -> ty::InstantiatedPredicates<'tcx> {
         let root_def_id = self.root_cx.root_def_id();
         // We will have to handle propagated closure requirements for this closure,
         // but need to defer this until the nested body has been fully borrow checked.
-        self.deferred_closure_requirements.push((def_id, args, locations));
+        self.deferred_closure_requirements.push((def_id, args, location.to_locations()));
 
         // Equate closure args to regions inherited from `root_def_id`. Fixes #98589.
         let typeck_root_args = ty::GenericArgs::identity_for_item(tcx, root_def_id);
@@ -2575,7 +2526,7 @@ fn prove_closure_bounds(
         if let Err(_) = self.eq_args(
             typeck_root_args,
             parent_args,
-            locations,
+            location.to_locations(),
             ConstraintCategory::BoringNoLocation,
         ) {
             span_mirbug!(