syntax_data: {"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":"UpvarArgs::Closure(args)"}]}
source_snippet:                     UpvarArgs::Closure(args) => {
context_before:                     }
context_after:                         Box::new(AggregateKind::Closure(closure_id.to_def_id(), args))