syntax_data: {"ast_node_type":"other","tokens":[{"end":90,"kind":"keyword","start":0,"text":"ty::CoroutineWitness(def_id,"}]}
source_snippet:         ty::CoroutineWitness(def_id, _) => Some(SimplifiedType::CoroutineWitness(def_id)),
context_before:         ty::Coroutine(def_id, _) => Some(SimplifiedType::Coroutine(def_id)),
context_after:         ty::Never => Some(SimplifiedType::Never),