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Avoid unnecessary note when type has escaping bounds

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This commit is contained in:
Esteban Küber 2024-12-26 01:40:43 +00:00
parent 91425d0ef8
commit 919f672c3d
2 changed files with 9 additions and 4 deletions
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12
compiler/rustc_mir_build/src/thir/pattern/const_to_pat.rs
View file

@ -385,13 +385,15 @@ fn extend_type_not_partial_eq<'tcx>(
/// The type has no `PartialEq` implementation, neither manual or derived, but
/// we don't have a span to point at, so we'll just add them as a `note`.
without: FxHashSet<Ty<'tcx>>,
/// If any of the subtypes has escaping bounds (`for<'a>`), we won't emit a note.
has_escaping_bound_vars: bool,
}
impl<'tcx> TypeVisitor<TyCtxt<'tcx>> for UsedParamsNeedInstantiationVisitor<'tcx> {
fn visit_ty(&mut self, ty: Ty<'tcx>) -> Self::Result {
if let ty::Adt(def, _args) = ty.kind()
&& !ty.has_escaping_bound_vars()
{
if ty.has_escaping_bound_vars() {
self.has_escaping_bound_vars = true;
} else if let ty::Adt(def, _args) = ty.kind() {
let ty_def_id = def.did();
let ty_def_span = self.tcx.def_span(ty_def_id);
let (impls_partial_eq, derived, structural, impl_def_id) =
@ -426,8 +428,12 @@ fn extend_type_not_partial_eq<'tcx>(
adts_without_partialeq: FxHashSet::default(),
manual: FxHashSet::default(),
without: FxHashSet::default(),
has_escaping_bound_vars: false,
};
v.visit_ty(ty);
if v.has_escaping_bound_vars {
return;
}
#[allow(rustc::potential_query_instability)] // Span labels will be sorted by the rendering
for span in v.adts_with_manual_partialeq {
err.span_note(span, "the `PartialEq` trait must be derived, manual `impl`s are not sufficient; see https://doc.rust-lang.org/stable/std/marker/trait.StructuralPartialEq.html for details");

1
tests/ui/consts/const_in_pattern/non_structural_with_escaping_bounds.stderr
View file

@ -8,7 +8,6 @@ LL | C => (),
| ^ constant of non-structural type
|
= note: see https://doc.rust-lang.org/stable/std/marker/trait.StructuralPartialEq.html for details
= note: `std::alloc::Global` must be annotated with `#[derive(PartialEq)]` to be usable in patterns
error: aborting due to 1 previous error