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Ignore own item bounds in parent alias types in for_each_item_bound

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This commit is contained in:
Michael Goulet 2024-02-11 18:23:05 +00:00
parent 899c895ba4
commit 38df5bdcf1
1 changed files with 16 additions and 0 deletions
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16
compiler/rustc_trait_selection/src/traits/select/mod.rs
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@ -1605,6 +1605,8 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
on_ambiguity: impl FnOnce(),
) -> ControlFlow<T, ()> {
let mut idx = 0;
let mut in_parent_alias_type = false;
loop {
let (kind, alias_ty) = match *self_ty.kind() {
ty::Alias(kind @ (ty::Projection | ty::Opaque), alias_ty) => (kind, alias_ty),
@ -1618,6 +1620,18 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
for bound in
self.tcx().item_bounds(alias_ty.def_id).instantiate(self.tcx(), alias_ty.args)
{
// HACK: On subsequent recursions, we only care about bounds that don't
// share the same type as `self_ty`. This is because for truly rigid
// projections, we will never be able to equate, e.g. `<T as Tr>::A`
// with `<<T as Tr>::A as Tr>::A`.
if in_parent_alias_type {
match bound.kind().skip_binder() {
ty::ClauseKind::Trait(tr) if tr.self_ty() == self_ty => continue,
ty::ClauseKind::Projection(p) if p.self_ty() == self_ty => continue,
_ => {}
}
}
for_each(self, bound, idx)?;
idx += 1;
}
@ -1627,6 +1641,8 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
} else {
return ControlFlow::Continue(());
}
in_parent_alias_type = true;
}
}