{"ast_node_type":"other","tokens":[{"end":76,"kind":"keyword","start":0,"text":"self.source_map.pat_field_map_back.insert(pat,"}]}
                        self.source_map.pat_field_map_back.insert(pat, src);
                        let src = self.expander.in_file(AstPtr::new(&f).wrap_right());
                        Some(RecordFieldPat { name, pat })