Auto merge of #108919 - matthiaskrgr:rollup-g271pm2, r=matthiaskrgr

Rollup of 8 pull requests

Successful merges:

 - #108686 (rustdoc: include link on all.html location header)
 - #108846 (StableMIR: Proof-of-concept implementation + test )
 - #108873 (Simplify `sort_by` calls)
 - #108883 (Suppress copy impl error when post-normalized type references errors)
 - #108884 (Tweak illegal `Copy` impl message)
 - #108887 (Rename `MapInPlace` as `FlatMapInPlace`.)
 - #108901 (fix: evaluate with wrong obligation stack)
 - #108903 (Move Clippy tests back to their intended directory)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

1 files changed, 9 insertions, 1 deletions

diff --git a/compiler/rustc_hir_analysis/src/coherence/builtin.rs b/compiler/rustc_hir_analysis/src/coherence/builtin.rs
index ffb68abf978..8294d92c936 100644
--- a/compiler/rustc_hir_analysis/src/coherence/builtin.rs
+++ b/compiler/rustc_hir_analysis/src/coherence/builtin.rs
@@ -2,6 +2,7 @@
 //! up data structures required by type-checking/codegen.
 
 use crate::errors::{CopyImplOnNonAdt, CopyImplOnTypeWithDtor, DropImplOnWrongItem};
+use rustc_data_structures::fx::FxHashSet;
 use rustc_errors::{struct_span_err, MultiSpan};
 use rustc_hir as hir;
 use rustc_hir::def_id::{DefId, LocalDefId};
@@ -86,7 +87,7 @@ fn visit_implementation_of_copy(tcx: TyCtxt<'_>, impl_did: LocalDefId) {
                 tcx.sess,
                 span,
                 E0204,
-                "the trait `Copy` may not be implemented for this type"
+                "the trait `Copy` cannot be implemented for this type"
             );
 
             // We'll try to suggest constraining type parameters to fulfill the requirements of
@@ -94,7 +95,14 @@ fn visit_implementation_of_copy(tcx: TyCtxt<'_>, impl_did: LocalDefId) {
             let mut errors: BTreeMap<_, Vec<_>> = Default::default();
             let mut bounds = vec![];
 
+            let mut seen_tys = FxHashSet::default();
+
             for (field, ty, reason) in fields {
+                // Only report an error once per type.
+                if !seen_tys.insert(ty) {
+                    continue;
+                }
+
                 let field_span = tcx.def_span(field.did);
                 err.span_label(field_span, "this field does not implement `Copy`");