{"ast_node_type":"other","tokens":[{"end":93,"kind":"keyword","start":0,"text":"debug!(?num_non_region_vars,"}]}
                    debug!(?num_non_region_vars, "too many inference variables -> overflow");
                if num_non_region_vars > self.cx().recursion_limit() {
                    return Ok(self.make_ambiguous_response_no_constraints(MaybeCause::Overflow {