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eagerly check for bound vars of predicates

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This commit is contained in:
lcnr 2022-07-14 12:47:38 +02:00
parent 39a990d2f1
commit 864d2f3528
2 changed files with 8 additions and 0 deletions
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4
compiler/rustc_middle/src/ty/fold.rs
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@ -448,6 +448,10 @@ impl<'a, 'tcx> TypeFolder<'tcx> for BoundVarReplacer<'a, 'tcx> {
_ => ct.super_fold_with(self),
}
}
fn fold_predicate(&mut self, p: ty::Predicate<'tcx>) -> ty::Predicate<'tcx> {
if p.has_vars_bound_at_or_above(self.current_index) { p.super_fold_with(self) } else { p }
}
}
impl<'tcx> TyCtxt<'tcx> {

4
compiler/rustc_trait_selection/src/traits/project.rs
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@ -756,6 +756,10 @@ impl<'tcx> TypeFolder<'tcx> for BoundVarReplacer<'_, 'tcx> {
_ => ct.super_fold_with(self),
}
}
fn fold_predicate(&mut self, p: ty::Predicate<'tcx>) -> ty::Predicate<'tcx> {
if p.has_vars_bound_at_or_above(self.current_index) { p.super_fold_with(self) } else { p }
}
}
// The inverse of `BoundVarReplacer`: replaces placeholders with the bound vars from which they came.