syntax_data: {"ast_node_type":"other","tokens":[{"end":35,"kind":"keyword","start":0,"text":"ty::Coroutine(_,"}]}
source_snippet:         ty::Coroutine(_, args) => {
context_before:         }
context_after:             iter_fields(args.as_coroutine().tupled_upvars_ty(), tcx, typing_env, f);