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Replace RPITIT current impl with new strategy that lowers as a GAT

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This commit is contained in:
Santiago Pastorino
2023-06-24 00:00:08 -03:00
parent d1389b9b48
commit 20429af7a3
146 changed files with 1106 additions and 586 deletions
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24
compiler/rustc_middle/src/ty/mod.rs
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@@ -2688,7 +2688,6 @@ impl<'tcx> TyCtxt<'tcx> {
| Some(ImplTraitInTraitData::Impl { fn_def_id, .. }) => fn_def_id,
None => {
while let def_kind = self.def_kind(def_id) && def_kind != DefKind::AssocFn {
debug_assert_eq!(def_kind, DefKind::ImplTraitPlaceholder);
def_id = self.parent(def_id);
}
def_id
@@ -2720,26 +2719,9 @@ impl<'tcx> TyCtxt<'tcx> {
let Some(trait_item_def_id) = item.trait_item_def_id else { return false; };
if self.lower_impl_trait_in_trait_to_assoc_ty() {
return !self
.associated_types_for_impl_traits_in_associated_fn(trait_item_def_id)
.is_empty();
}
// FIXME(RPITIT): This does a somewhat manual walk through the signature
// of the trait fn to look for any RPITITs, but that's kinda doing a lot
// of work. We can probably remove this when we refactor RPITITs to be
// associated types.
self.fn_sig(trait_item_def_id).subst_identity().skip_binder().output().walk().any(|arg| {
if let ty::GenericArgKind::Type(ty) = arg.unpack()
&& let ty::Alias(ty::Projection, data) = ty.kind()
&& self.def_kind(data.def_id) == DefKind::ImplTraitPlaceholder
{
true
} else {
false
}
})
return !self
.associated_types_for_impl_traits_in_associated_fn(trait_item_def_id)
.is_empty();
}
}