{"ast_node_type":"other","tokens":[{"end":66,"kind":"keyword","start":0,"text":"outlives_env:"}]}
    outlives_env: LazyCell<OutlivesEnvironment<'tcx>, OutlivesFn>,
    variances: LazyCell<FxHashMap<DefId, ty::Variance>, VarFn>,
    seen: FxIndexSet<LocalDefId>,