{"ast_node_type":"other","tokens":[{"end":136,"kind":"keyword","start":0,"text":"AsyncFnOnce,"}]}
    AsyncFnOnce,             sym::async_fn_once,       async_fn_once_trait,        Target::Trait,          GenericRequirement::Exact(1);
    AsyncFnMut,              sym::async_fn_mut,        async_fn_mut_trait,         Target::Trait,          GenericRequirement::Exact(1);
    AsyncFnOnceOutput,       sym::async_fn_once_output, async_fn_once_output,       Target::AssocTy,        GenericRequirement::Exact(1);