{"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 (alloc_id, meta) = alloc_type_name(tcx, tp_ty);