{"ast_node_type":"other","tokens":[{"end":44,"kind":"keyword","start":0,"text":"///"}]}
    /// Allows using the `box $expr` syntax.
     Some("subsumed by `.await` syntax"), 62293),
    (removed, box_syntax, "1.70.0", Some(49733), Some("replaced with `#[rustc_box]`"), 108471),