{"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"(Some(FnTrait::FnOnce),"}]}
                    (Some(FnTrait::FnOnce), FnTrait::Fn | FnTrait::FnMut) => {
                    (Some(FnTrait::FnMut), FnTrait::Fn) => expected_kind = Some(FnTrait::Fn),
                        expected_kind = Some(closure_kind)