Issue #50974: Fix compilation error and test

Author: lambtowolf

src/libsyntax/parse/parser.rs

@@ -776,7 +776,7 @@ impl<'a> Parser<'a> {
             err.span_label(self.span, format!("expected identifier, found {}", token_descr));
         } else {
             err.span_label(self.span, "expected identifier");
-            if self.token == token::Comma && self.look_ahead(1, |t| *t.is_ident()) {
+            if self.token == token::Comma && self.look_ahead(1, |t| t.is_ident()) {
                 err.span_suggestion(self.span, "remove this comma", "".into());
             }
         }

src/test/ui/struct-duplicate-comma.stderr

@@ -7,7 +7,7 @@ LL |         a: 0,,
    |              ^
    |              |
    |              expected identifier
-   |              help: remove this comma: `,`
+   |              help: remove this comma
 
 error: aborting due to previous error