{"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"this.is_lowering_coroutine"}]}
                this.is_lowering_coroutine = prev_is_lowering_coroutine;
                    if e.move_token().is_some() { CaptureBy::Value } else { CaptureBy::Ref };
                this.current_binding_owner = prev_binding_owner;