Add an `ErrorGuaranteed` to `ast::TyKind::Err`.

This makes it more like `hir::TyKind::Err`, and avoids a
`span_delayed_bug` call in `LoweringContext::lower_ty_direct`.

It also requires adding `ast::TyKind::Dummy`, now that
`ast::TyKind::Err` can't be used for that purpose in the absence of an
error emission.

There are a couple of cases that aren't as neat as I would have liked,
marked with `FIXME` comments.

1 files changed, 6 insertions, 4 deletions

diff --git a/compiler/rustc_parse/src/parser/ty.rs b/compiler/rustc_parse/src/parser/ty.rs
index 157fb9e505a..f79f2a813b2 100644
--- a/compiler/rustc_parse/src/parser/ty.rs
+++ b/compiler/rustc_parse/src/parser/ty.rs
@@ -346,8 +346,10 @@ impl<'a> Parser<'a> {
                 AllowCVariadic::No => {
                     // FIXME(Centril): Should we just allow `...` syntactically
                     // anywhere in a type and use semantic restrictions instead?
-                    self.dcx().emit_err(NestedCVariadicType { span: lo.to(self.prev_token.span) });
-                    TyKind::Err
+                    let guar = self
+                        .dcx()
+                        .emit_err(NestedCVariadicType { span: lo.to(self.prev_token.span) });
+                    TyKind::Err(guar)
                 }
             }
         } else {
@@ -493,8 +495,8 @@ impl<'a> Parser<'a> {
             {
                 // Recover from `[LIT; EXPR]` and `[LIT]`
                 self.bump();
-                err.emit();
-                self.mk_ty(self.prev_token.span, TyKind::Err)
+                let guar = err.emit();
+                self.mk_ty(self.prev_token.span, TyKind::Err(guar))
             }
             Err(err) => return Err(err),
         };