syntax_data: {"ast_node_type":"other","tokens":[{"end":54,"kind":"keyword","start":0,"text":"hir::CoroutineKind::Desugared("}]}
source_snippet:                         hir::CoroutineKind::Desugared(
context_before:                         ) => write!(self, "async gen closure")?,
context_after:                             hir::CoroutineDesugaring::Gen,