{"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"(Some(ClosureKind::FnMut),"}]}
                        (Some(ClosureKind::FnMut), ClosureKind::Fn) => {
                        (None, _) => expected_kind = Some(found_kind),
                            expected_kind = Some(ClosureKind::Fn)