{"ast_node_type":"other","tokens":[{"end":92,"kind":"keyword","start":0,"text":"Err(NotUniqueParam::NotParam(param))"}]}
                    Err(NotUniqueParam::NotParam(param)) if param.is_non_region_infer() => {
                match uses_unique_placeholders_ignoring_regions(self.cx(), opaque_ty.args) {
                        return self.evaluate_added_goals_and_make_canonical_response(