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.
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@ -690,7 +690,7 @@ pub fn eq_ty(l: &Ty, r: &Ty) -> bool {
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match (&l.kind, &r.kind) {
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match (&l.kind, &r.kind) {
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(Paren(l), _) => eq_ty(l, r),
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(Paren(l), _) => eq_ty(l, r),
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(_, Paren(r)) => eq_ty(l, r),
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(_, Paren(r)) => eq_ty(l, r),
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(Never, Never) | (Infer, Infer) | (ImplicitSelf, ImplicitSelf) | (Err, Err) | (CVarArgs, CVarArgs) => true,
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(Never, Never) | (Infer, Infer) | (ImplicitSelf, ImplicitSelf) | (Err(_), Err(_)) | (CVarArgs, CVarArgs) => true,
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(Slice(l), Slice(r)) => eq_ty(l, r),
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(Slice(l), Slice(r)) => eq_ty(l, r),
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(Array(le, ls), Array(re, rs)) => eq_ty(le, re) && eq_expr(&ls.value, &rs.value),
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(Array(le, ls), Array(re, rs)) => eq_ty(le, re) && eq_expr(&ls.value, &rs.value),
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(Ptr(l), Ptr(r)) => l.mutbl == r.mutbl && eq_ty(&l.ty, &r.ty),
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(Ptr(l), Ptr(r)) => l.mutbl == r.mutbl && eq_ty(&l.ty, &r.ty),
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