Rollup merge of #122540 - WaffleLapkin:ununexpected, r=estebank

Do not use `?`-induced skewing of type inference in the compiler

This prevents breakage from #122412 and is generally a good idea.

r? `@estebank`

compiler/rustc_parse/src/parser/path.rs

@@ -660,7 +660,7 @@ impl<'a> Parser<'a> {
                     // Add `>` to the list of expected tokens.
                     self.check(&token::Gt);
                     // Handle `,` to `;` substitution
-                    let mut err = self.unexpected::<()>().unwrap_err();
+                    let mut err = self.unexpected().unwrap_err();
                     self.bump();
                     err.span_suggestion_verbose(
                         self.prev_token.span.until(self.token.span),