syntax_data: {"ast_node_type":"other","tokens":[{"end":88,"kind":"keyword","start":0,"text":"ty::Coroutine(did,"}]}
source_snippet:             ty::Coroutine(did, args) => ty::Coroutine(did, args.try_fold_with(folder)?),
context_before:             }
context_after:             ty::CoroutineWitness(did, args) => {