{"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":"Some(Desugared(Async,"}]}
        Some(Desugared(Async, Fn)) => "async_fn",
        Some(Desugared(Async, Closure)) => "async_closure",
        Some(Desugared(AsyncGen, Block)) => "async_gen_block",