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Remove an unchecked_error_guaranteed call. #121379

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Merged
merged 1 commit into from
Feb 21, 2024
Merged

Remove an unchecked_error_guaranteed call. #121379

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7 changes: 4 additions & 3 deletions compiler/rustc_ast_passes/src/ast_validation.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -881,9 +881,10 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
&item.vis,
errors::VisibilityNotPermittedNote::TraitImpl,
);
// njn: use Dummy here
if let TyKind::Err(_) = self_ty.kind {
this.dcx().emit_err(errors::ObsoleteAuto { span: item.span });
if let TyKind::Dummy = self_ty.kind {
// Abort immediately otherwise the `TyKind::Dummy` will reach HIR lowering,
// which isn't allowed. Not a problem for this obscure, obsolete syntax.
this.dcx().emit_fatal(errors::ObsoleteAuto { span: item.span });
}
if let (&Unsafe::Yes(span), &ImplPolarity::Negative(sp)) = (unsafety, polarity)
{
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20 changes: 4 additions & 16 deletions compiler/rustc_parse/src/parser/item.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -592,22 +592,10 @@ impl<'a> Parser<'a> {
// We need to report this error after `cfg` expansion for compatibility reasons
self.bump(); // `..`, do not add it to expected tokens

// FIXME(nnethercote): AST validation later detects this
// `TyKind::Err` and emits an errors. So why the unchecked
// ErrorGuaranteed?
// - A `span_delayed_bug` doesn't work here, because rustfmt can
// hit this path but then not hit the follow-up path in the AST
// validator that issues the error, which results in ICEs.
// - `TyKind::Dummy` doesn't work, because it ends up reaching HIR
// lowering, which results in ICEs. Changing `TyKind::Dummy` to
// `TyKind::Err` during AST validation might fix that, but that's
// not possible because AST validation doesn't allow mutability.
//
// #121072 will hopefully remove all this special handling of the
// obsolete `impl Trait for ..` and then this can go away.
#[allow(deprecated)]
let guar = rustc_errors::ErrorGuaranteed::unchecked_error_guaranteed();
Some(self.mk_ty(self.prev_token.span, TyKind::Err(guar)))
// AST validation later detects this `TyKind::Dummy` and emits an
// error. (#121072 will hopefully remove all this special handling
// of the obsolete `impl Trait for ..` and then this can go away.)
Some(self.mk_ty(self.prev_token.span, TyKind::Dummy))
} else if has_for || self.token.can_begin_type() {
Some(self.parse_ty()?)
} else {
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