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Fix panic when compiling Rocket.

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`Rustc::emit_diagnostic` reconstructs a diagnostic passed in from the
macro machinery. Currently it uses the type `DiagnosticBuilder<'_,
ErrorGuaranteed>`, which is incorrect, because the diagnostic might be a
warning. And if it is a warning, because of the `ErrorGuaranteed` we end
up calling into `emit_producing_error_guaranteed` and the assertion
within that function (correctly) fails because the level is not an error
level.

The fix is simple: change the type to `DiagnosticBuilder<'_, ()>`. Using
`()` works no matter what the diagnostic level is, and we don't need an
`ErrorGuaranteed` here.

The panic was reported in #120576.
This commit is contained in:
Nicholas Nethercote 2024-02-22 11:53:40 +11:00
parent f8131a48a4
commit 326b44e4d3
1 changed files with 1 additions and 1 deletions
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2
compiler/rustc_expand/src/proc_macro_server.rs
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@ -510,7 +510,7 @@ impl server::FreeFunctions for Rustc<'_, '_> {
fn emit_diagnostic(&mut self, diagnostic: Diagnostic<Self::Span>) {
let message = rustc_errors::DiagnosticMessage::from(diagnostic.message);
let mut diag: DiagnosticBuilder<'_, rustc_errors::ErrorGuaranteed> =
let mut diag: DiagnosticBuilder<'_, ()> =
DiagnosticBuilder::new(&self.sess().dcx, diagnostic.level.to_internal(), message);
diag.span(MultiSpan::from_spans(diagnostic.spans));
for child in diagnostic.children {