syntax_data: {"ast_node_type":"other","tokens":[{"end":82,"kind":"keyword","start":0,"text":"Closure(d,"}]}
source_snippet:             Closure(d, s) => f.debug_tuple("Closure").field(d).field(&s).finish(),
context_before:             },
context_after:             CoroutineClosure(d, s) => f.debug_tuple("CoroutineClosure").field(d).field(&s).finish(),