{"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":"ensure_monomorphic_enough(tcx,"}]}
                ensure_monomorphic_enough(tcx, tp_ty)?;
                let tp_ty = instance.args.type_at(0);
                let val = ConstValue::from_bool(tp_ty.needs_drop(tcx, self.typing_env));