{"ast_node_type":"other","tokens":[{"end":136,"kind":"keyword","start":0,"text":"CallRefFuture,"}]}
    CallRefFuture,           sym::call_ref_future,     call_ref_future,            Target::AssocTy,        GenericRequirement::Exact(2);
    CallOnceFuture,          sym::call_once_future,    call_once_future,           Target::AssocTy,        GenericRequirement::Exact(1);
    AsyncFnKindHelper,       sym::async_fn_kind_helper, async_fn_kind_helper,      Target::Trait,          GenericRequirement::Exact(1);