{"ast_node_type":"other","tokens":[{"end":137,"kind":"keyword","start":0,"text":"AsyncFnOnceOutput,"}]}
    AsyncFnOnceOutput,       sym::async_fn_once_output, async_fn_once_output,       Target::AssocTy,        GenericRequirement::Exact(1);
    AsyncFnOnce,             sym::async_fn_once,       async_fn_once_trait,        Target::Trait,          GenericRequirement::Exact(1);
    CallOnceFuture,          sym::call_once_future,    call_once_future,           Target::AssocTy,        GenericRequirement::Exact(1);