PRINT-ATTR INPUT (DISPLAY): fn foo<T>() where T: Copy + {}
PRINT-ATTR RE-COLLECTED (DISPLAY): fn foo < T > () where T : Copy + {}
PRINT-ATTR INPUT (DEBUG): TokenStream [
    Ident {
        ident: "fn",
        span: $DIR/trailing-plus.rs:11:1: 11:3 (#0),
    },
    Ident {
        ident: "foo",
        span: $DIR/trailing-plus.rs:11:4: 11:7 (#0),
    },
    Punct {
        ch: '<',
        spacing: Alone,
        span: $DIR/trailing-plus.rs:11:7: 11:8 (#0),
    },
    Ident {
        ident: "T",
        span: $DIR/trailing-plus.rs:11:8: 11:9 (#0),
    },
    Punct {
        ch: '>',
        spacing: Alone,
        span: $DIR/trailing-plus.rs:11:9: 11:10 (#0),
    },
    Group {
        delimiter: Parenthesis,
        stream: TokenStream [],
        span: $DIR/trailing-plus.rs:11:10: 11:12 (#0),
    },
    Ident {
        ident: "where",
        span: $DIR/trailing-plus.rs:11:13: 11:18 (#0),
    },
    Ident {
        ident: "T",
        span: $DIR/trailing-plus.rs:11:19: 11:20 (#0),
    },
    Punct {
        ch: ':',
        spacing: Alone,
        span: $DIR/trailing-plus.rs:11:20: 11:21 (#0),
    },
    Ident {
        ident: "Copy",
        span: $DIR/trailing-plus.rs:11:22: 11:26 (#0),
    },
    Punct {
        ch: '+',
        spacing: Alone,
        span: $DIR/trailing-plus.rs:11:27: 11:28 (#0),
    },
    Group {
        delimiter: Brace,
        stream: TokenStream [],
        span: $DIR/trailing-plus.rs:11:29: 12:2 (#0),
    },
]