bjoernager/rust
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internally change regions to be covariant

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This commit is contained in:
Ali MJ Al-Nasrawy 2023-01-27 02:23:08 +03:00
parent c62665e09c
commit 381187dc76
18 changed files with 43 additions and 52 deletions
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8
compiler/rustc_hir_analysis/src/variance/constraints.rs
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@ -221,8 +221,7 @@ impl<'a, 'tcx> ConstraintContext<'a, 'tcx> {
}
ty::Ref(region, ty, mutbl) => {
let contra = self.contravariant(variance);
self.add_constraints_from_region(current, region, contra);
self.add_constraints_from_region(current, region, variance);
self.add_constraints_from_mt(current, &ty::TypeAndMut { ty, mutbl }, variance);
}
@ -254,9 +253,8 @@ impl<'a, 'tcx> ConstraintContext<'a, 'tcx> {
}
ty::Dynamic(data, r, _) => {
// The type `Foo<T+'a>` is contravariant w/r/t `'a`:
let contra = self.contravariant(variance);
self.add_constraints_from_region(current, r, contra);
// The type `Foo<T + 'a>` is covariant w/r/t `'a`:
self.add_constraints_from_region(current, r, variance);
if let Some(poly_trait_ref) = data.principal() {
self.add_constraints_from_invariant_substs(