bjoernager/rust
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Change to just use first binders and add test

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This commit is contained in:
Jack Huey 2021-05-15 15:19:01 -04:00
parent c34e7c60f5
commit 0daabbee2d
5 changed files with 218 additions and 27 deletions
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4
compiler/rustc_typeck/src/astconv/mod.rs
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@ -1386,11 +1386,13 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
let auto_trait_predicates = auto_traits.into_iter().map(|trait_ref| {
ty::Binder::dummy(ty::ExistentialPredicate::AutoTrait(trait_ref.trait_ref().def_id()))
});
// N.b. principal, projections, auto traits
// FIXME: This is actually wrong with multiple principals in regards to symbol mangling
let mut v = regular_trait_predicates
.chain(auto_trait_predicates)
.chain(
existential_projections.map(|x| x.map_bound(ty::ExistentialPredicate::Projection)),
)
.chain(auto_trait_predicates)
.collect::<SmallVec<[_; 8]>>();
v.sort_by(|a, b| a.skip_binder().stable_cmp(tcx, &b.skip_binder()));
v.dedup();