syntax_data: {"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"hir::CoroutineKind::Desugared(hir::CoroutineDesugaring::Gen,"}]}
source_snippet:                 hir::CoroutineKind::Desugared(hir::CoroutineDesugaring::Gen, _) => {
context_before:                 }
context_after:                     // The signature should be `Iterator::next(_) -> Option<Yield>`