{"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"locs.push(MatcherLoc::Token"}]}
                    locs.push(MatcherLoc::Token { token: open_token });
                    locs.push(MatcherLoc::Delimited);
                    inner(&delimited.tts, locs, next_metavar, seq_depth);