syntax_data: {"ast_node_type":"other","tokens":[{"end":66,"kind":"keyword","start":0,"text":"ty::Coroutine(_did,"}]}
source_snippet:             ty::Coroutine(_did, args) => args.visit_with(visitor),
context_before:             }
context_after:             ty::CoroutineWitness(_did, args) => args.visit_with(visitor),