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Take the polarity into account in compute_applicable_impls

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This commit is contained in:
Urgau 2024-03-18 22:43:46 +01:00
parent 96eaf553e5
commit 524f3c9c44
1 changed files with 11 additions and 0 deletions
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11
compiler/rustc_trait_selection/src/traits/error_reporting/ambiguity.rs
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@ -19,6 +19,8 @@ pub fn recompute_applicable_impls<'tcx>(
let tcx = infcx.tcx;
let param_env = obligation.param_env;
let predicate_polarity = obligation.predicate.skip_binder().polarity;
let impl_may_apply = |impl_def_id| {
let ocx = ObligationCtxt::new(infcx);
infcx.enter_forall(obligation.predicate, |placeholder_obligation| {
@ -40,6 +42,15 @@ pub fn recompute_applicable_impls<'tcx>(
return false;
}
let impl_trait_header = tcx.impl_trait_header(impl_def_id).unwrap();
let impl_polarity = impl_trait_header.polarity;
match (impl_polarity, predicate_polarity) {
(ty::ImplPolarity::Positive, ty::PredicatePolarity::Positive)
| (ty::ImplPolarity::Negative, ty::PredicatePolarity::Negative) => {}
_ => return false,
}
let impl_predicates = tcx.predicates_of(impl_def_id).instantiate(tcx, impl_args);
ocx.register_obligations(impl_predicates.predicates.iter().map(|&predicate| {
Obligation::new(tcx, ObligationCause::dummy(), param_env, predicate)