{"ast_node_type":"other","tokens":[{"end":70,"kind":"keyword","start":0,"text":"///"}]}
    /// we may not have decided yet whether `c` is a `Fn`, `FnMut`, or
    /// When we process a call like `c()` where `c` is a closure type,
    /// `FnOnce` closure. In that case, we defer full resolution of the