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Do not consider a T: !Sized candidate to satisfy a T: !MetaSized obligation.

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This commit is contained in:
Zachary S
2025-08-09 23:16:19 -05:00
parent 2e2642e641
commit c7cd1b3b9d
5 changed files with 117 additions and 7 deletions
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8
compiler/rustc_trait_selection/src/traits/util.rs
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@@ -9,8 +9,8 @@ pub use rustc_infer::traits::util::*;
use rustc_middle::bug;
use rustc_middle::ty::fast_reject::DeepRejectCtxt;
use rustc_middle::ty::{
self, PolyTraitPredicate, SizedTraitKind, TraitPredicate, TraitRef, Ty, TyCtxt, TypeFoldable,
TypeFolder, TypeSuperFoldable, TypeVisitableExt,
self, PolyTraitPredicate, PredicatePolarity, SizedTraitKind, TraitPredicate, TraitRef, Ty,
TyCtxt, TypeFoldable, TypeFolder, TypeSuperFoldable, TypeVisitableExt,
};
pub use rustc_next_trait_solver::placeholder::BoundVarReplacer;
use rustc_span::Span;
@@ -427,7 +427,9 @@ pub(crate) fn lazily_elaborate_sizedness_candidate<'tcx>(
return candidate;
}
if obligation.predicate.polarity() != candidate.polarity() {
if obligation.predicate.polarity() != PredicatePolarity::Positive
|| candidate.polarity() != PredicatePolarity::Positive
{
return candidate;
}