{"ast_node_type":"other","tokens":[{"end":19,"kind":"keyword","start":0,"text":"arena_cache"}]}
        arena_cache
    query mir_coroutine_witnesses(key: DefId) -> Option<&'tcx mir::CoroutineLayout<'tcx>> {
        desc { |tcx| "coroutine witness types for `{}`", tcx.def_path_str(key) }