syntax_data: {"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"CoroutineKind::Desugared(CoroutineDesugaring::Async,"}]}
source_snippet:             CoroutineKind::Desugared(CoroutineDesugaring::Async, _) => {
context_before:         let rvalue = match self.coroutine_kind {
context_after:                 let poll_def_id = self.tcx.require_lang_item(LangItem::Poll, source_info.span);