syntax_data: {"ast_node_type":"other","tokens":[{"end":36,"kind":"keyword","start":0,"text":"Never"}]}
source_snippet:             Never => write!(f, "!"),
context_before:             CoroutineWitness(d, s) => f.debug_tuple("CoroutineWitness").field(d).field(&s).finish(),
context_after:             Tuple(t) => {