{"ast_node_type":"other","tokens":[{"end":60,"kind":"keyword","start":0,"text":"///"}]}
    /// Allows `#[track_caller]` on closures and coroutines.
    (unstable, closure_lifetime_binder, "1.64.0", Some(97362)),
    (unstable, closure_track_caller, "1.57.0", Some(87417)),