{"ast_node_type":"other","tokens":[{"end":86,"kind":"keyword","start":0,"text":"///"}]}
    /// we identify the `FnOnce<Args, Output = ?Fut>` bound, and if the output type is
    /// closure. We will have two projection predicates registered in this case. First,
    /// an inference variable `?Fut`, we check if that is bounded by a `Future<Output = Ty>`