{"ast_node_type":"other","tokens":[{"end":80,"kind":"keyword","start":0,"text":"TyDefId::BuiltinType(builtin)"}]}
            TyDefId::BuiltinType(builtin) => return TyBuilder::builtin(builtin),
        let generic_def = match typeable {
            TyDefId::AdtId(it) => it.into(),