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Auto merge of #112652 - oli-obk:tait_only_in_sig, r=compiler-errors

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Require TAITs to be mentioned in the signatures of functions that register hidden types for them

r? `@lcnr` `@compiler-errors`

This implements the lang team decision from [the TAIT design meeting](https://rust-lang.zulipchat.com/#narrow/stream/213817-t-lang/topic/design.20meeting.202023-05-31.20TAITs/near/362518164).
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bors 2023-07-08 03:22:54 +00:00
commit d4096e0412
76 changed files with 783 additions and 191 deletions
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2
compiler/rustc_infer/src/infer/error_reporting/note_and_explain.rs
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@ -257,7 +257,7 @@ impl<T> Trait<T> for X {
);
}
}
(ty::Alias(ty::Opaque, alias), _) | (_, ty::Alias(ty::Opaque, alias)) if alias.def_id.is_local() && matches!(tcx.def_kind(body_owner_def_id), DefKind::AssocFn | DefKind::AssocConst) => {
(ty::Alias(ty::Opaque, alias), _) | (_, ty::Alias(ty::Opaque, alias)) if alias.def_id.is_local() && matches!(tcx.def_kind(body_owner_def_id), DefKind::Fn | DefKind::Static(_) | DefKind::Const | DefKind::AssocFn | DefKind::AssocConst) => {
if tcx.is_type_alias_impl_trait(alias.def_id) {
if !tcx.opaque_types_defined_by(body_owner_def_id.expect_local()).contains(&alias.def_id.expect_local()) {
let sp = tcx.def_ident_span(body_owner_def_id).unwrap_or_else(|| tcx.def_span(body_owner_def_id));