Parse const unsafe trait properly

Previously, this was greedily stolen by the `fn` parsing logic.
2025-10-18 23:35:23 +00:00
parent 6380899f32
commit b145213cee
2 changed files with 17 additions and 1 deletions
--- a/compiler/rustc_parse/src/parser/item.rs
+++ b/compiler/rustc_parse/src/parser/item.rs
@@ -2664,7 +2664,10 @@ impl<'a> Parser<'a> {
                        // Rule out `unsafe extern {`.
                        && !self.is_unsafe_foreign_mod()
                        // Rule out `async gen {` and `async gen move {`
-                        && !self.is_async_gen_block())
+                        && !self.is_async_gen_block()
+                        // Rule out `const unsafe auto` and `const unsafe trait`.
+                        && !self.is_keyword_ahead(2, &[kw::Auto, kw::Trait])
+                    )
                })
            // `extern ABI fn`
            || self.check_keyword_case(exp!(Extern), case)