{"ast_node_type":"other","tokens":[{"end":64,"kind":"keyword","start":0,"text":"Some(CallStep::DeferredClosure(def_id,"}]}
            Some(CallStep::DeferredClosure(def_id, fn_sig)) => {
                self.confirm_deferred_closure_call(call_expr, arg_exprs, expected, def_id, fn_sig)