{"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":"ClosureKind::Async"}]}
                ClosureKind::Async | ClosureKind::Coroutine(_) => (None, None),
                ClosureKind::Closure => (Some(fn_ptr.substitution.clone()), Some(FnTrait::Fn)),
            },