syntax_data: {"ast_node_type":"other","tokens":[{"end":21,"kind":"keyword","start":0,"text":"{"}]}
source_snippet:                     {
context_before:                     match self.tcx().coroutine_kind(self.tcx().coroutine_for_closure(did)).unwrap()
context_after:                         hir::CoroutineKind::Desugared(