syntax_data: {"ast_node_type":"other","tokens":[{"end":77,"kind":"keyword","start":0,"text":"UpvarArgs::Closure(args)"}]}
source_snippet:             UpvarArgs::Closure(args) => args.as_closure().tupled_upvars_ty(),
context_before:         let tupled_tys = match self {
context_after:             UpvarArgs::Coroutine(args) => args.as_coroutine().tupled_upvars_ty(),