syntax_data: {"ast_node_type":"other","tokens":[{"end":74,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // have an ordinary coroutine, the `Future::poll(...) -> Poll`
context_before:             // `Coroutine::resume(...) -> CoroutineState` function in case we
context_after:             // function in case this is a special coroutine backing an async construct