{"ast_node_type":"other","tokens":[{"end":63,"kind":"keyword","start":0,"text":"TyKind::Tuple(_,"}]}
                        TyKind::Tuple(_, s) => s.len(Interner),
                    let field_count = match self.result[tgt_pat].kind(Interner) {
                        _ => break 'reset_span_stack,