Rollup merge of #93290 - lcnr:same_type, r=jackh726

remove `TyS::same_type`

This function ignored regions and constants in adts, but didn't do so for references or any other types. cc https://github.com/rust-lang/rust/pull/93148#discussion_r791408057

compiler/rustc_lint/src/builtin.rs

@@ -2833,7 +2833,7 @@ impl ClashingExternDeclarations {
                 return true;
             }
             let tcx = cx.tcx;
-            if a == b || rustc_middle::ty::TyS::same_type(a, b) {
+            if a == b {
                 // All nominally-same types are structurally same, too.
                 true
             } else {

compiler/rustc_middle/src/ty/util.rs

@@ -893,19 +893,6 @@ impl<'tcx> ty::TyS<'tcx> {
         }
     }
 
-    pub fn same_type(a: Ty<'tcx>, b: Ty<'tcx>) -> bool {
-        match (&a.kind(), &b.kind()) {
-            (&Adt(did_a, substs_a), &Adt(did_b, substs_b)) => {
-                if did_a != did_b {
-                    return false;
-                }
-
-                substs_a.types().zip(substs_b.types()).all(|(a, b)| Self::same_type(a, b))
-            }
-            _ => a == b,
-        }
-    }
-
     /// Peel off all reference types in this type until there are none left.
     ///
     /// This method is idempotent, i.e. `ty.peel_refs().peel_refs() == ty.peel_refs()`.

compiler/rustc_mir_transform/src/function_item_references.rs

@@ -6,7 +6,7 @@ use rustc_middle::mir::*;
 use rustc_middle::ty::{
     self,
     subst::{GenericArgKind, Subst, SubstsRef},
-    PredicateKind, Ty, TyCtxt, TyS,
+    PredicateKind, Ty, TyCtxt,
 };
 use rustc_session::lint::builtin::FUNCTION_ITEM_REFERENCES;
 use rustc_span::{symbol::sym, Span};
@@ -88,7 +88,7 @@ impl<'tcx> FunctionItemRefChecker<'_, 'tcx> {
                     for generic_inner_ty in arg_def.walk() {
                         if let GenericArgKind::Type(inner_ty) = generic_inner_ty.unpack() {
                             // If the inner type matches the type bound by `Pointer`
-                            if TyS::same_type(inner_ty, bound_ty) {
+                            if inner_ty == bound_ty {
                                 // Do a substitution using the parameters from the callsite
                                 let subst_ty = inner_ty.subst(self.tcx, substs_ref);
                                 if let Some((fn_id, fn_substs)) =

compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs

@@ -1555,7 +1555,7 @@ impl<'a, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'a, 'tcx> {
             // `erase_late_bound_regions`.
             let ty_erased = self.tcx.erase_late_bound_regions(ty);
             let ty_erased = self.tcx.erase_regions(ty_erased);
-            let eq = ty::TyS::same_type(ty_erased, target_ty_erased);
+            let eq = ty_erased == target_ty_erased;
             debug!(
                 "maybe_note_obligation_cause_for_async_await: ty_erased={:?} \
                     target_ty_erased={:?} eq={:?}",

compiler/rustc_ty_utils/src/representability.rs

@@ -322,7 +322,7 @@ fn is_type_structurally_recursive_inner<'tcx>(
                 // struct Foo { Option<Option<Foo>> }
 
                 for &seen_adt in iter {
-                    if ty::TyS::same_type(ty, seen_adt) {
+                    if ty == seen_adt {
                         debug!("ContainsRecursive: {:?} contains {:?}", seen_adt, ty);
                         return Representability::ContainsRecursive;
                     }