{"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"impl<'tcx>"}]}
impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for &'tcx ty::List<Ty<'tcx>> {
    fn try_fold_with<F: FallibleTypeFolder<TyCtxt<'tcx>>>(