{"ast_node_type":"impl","tokens":[{"end":108,"kind":"keyword","start":0,"text":"*"}]}
     * - because `Option<Vec<i32>>: Copy` needs `Vec<i32>: Copy` because `impl <T: Copy> Copy for Option<T>`
     * - want `Vec<i32>: Copy`
     * - because `(Option<Vec<i32>, bool)` needs `Option<Vec<i32>>: Copy` because `impl <A: Copy, B: Copy> Copy for (A, B)`