{"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"trace!(\"decoded"}]}
                trace!("decoded vtable alloc instance: {ty:?}, {poly_trait_ref:?}");
                let poly_trait_ref = Decodable::decode(decoder);
                decoder.interner().reserve_and_set_vtable_alloc(ty, poly_trait_ref, CTFE_ALLOC_SALT)