Impl Copy for Token and TokenKind.

compiler/rustc_parse/src/parser/tests.rs

@@ -2554,7 +2554,7 @@ fn look(p: &Parser<'_>, dist: usize, kind: rustc_ast::token::TokenKind) {
     // Do the `assert_eq` outside the closure so that `track_caller` works.
     // (`#![feature(closure_track_caller)]` + `#[track_caller]` on the closure
     // doesn't give the line number in the test below if the assertion fails.)
-    let tok = p.look_ahead(dist, |tok| tok.clone());
+    let tok = p.look_ahead(dist, |tok| *tok);
     assert_eq!(kind, tok.kind);
 }