syntax_data: {"ast_node_type":"variable","tokens":[{"end":91,"kind":"keyword","start":0,"text":"DefKind::Closure"}]}
source_snippet:             DefKind::Closure if let Some(coroutine_kind) = self.coroutine_kind(def_id) => {
context_before:             DefKind::AssocTy if self.opt_rpitit_info(def_id).is_some() => "opaque type",
context_after:                 match coroutine_kind {