syntax_data: {"ast_node_type":"other","tokens":[{"end":100,"kind":"keyword","start":0,"text":"CoroutineWitness(d,"}]}
source_snippet:             CoroutineWitness(d, s) => f.debug_tuple("CoroutineWitness").field(d).field(&s).finish(),
context_before:             Coroutine(d, s) => f.debug_tuple("Coroutine").field(d).field(&s).finish(),
context_after:             Never => write!(f, "!"),