PRINT-ATTR INPUT (DISPLAY): #[rustc_dummy] { 1 + 1 ; }
PRINT-ATTR INPUT (DEBUG): TokenStream [
    Punct {
        ch: '#',
        spacing: Alone,
        span: $DIR/keep-expr-tokens.rs:22:5: 22:6 (#0),
    },
    Group {
        delimiter: Bracket,
        stream: TokenStream [
            Ident {
                ident: "rustc_dummy",
                span: $DIR/keep-expr-tokens.rs:22:7: 22:18 (#0),
            },
        ],
        span: $DIR/keep-expr-tokens.rs:22:6: 22:19 (#0),
    },
    Group {
        delimiter: Brace,
        stream: TokenStream [
            Literal {
                kind: Integer,
                symbol: "1",
                suffix: None,
                span: $DIR/keep-expr-tokens.rs:23:7: 23:8 (#0),
            },
            Punct {
                ch: '+',
                spacing: Alone,
                span: $DIR/keep-expr-tokens.rs:23:9: 23:10 (#0),
            },
            Literal {
                kind: Integer,
                symbol: "1",
                suffix: None,
                span: $DIR/keep-expr-tokens.rs:23:10: 23:11 (#0),
            },
            Punct {
                ch: ';',
                spacing: Alone,
                span: $DIR/keep-expr-tokens.rs:23:11: 23:12 (#0),
            },
        ],
        span: $DIR/keep-expr-tokens.rs:23:5: 23:14 (#0),
    },
]