syntax_data: {"ast_node_type":"other","tokens":[{"end":34,"kind":"keyword","start":0,"text":"Closure(GenericArgsRef<'tcx>),"}]}
source_snippet:     Closure(GenericArgsRef<'tcx>),
context_before: pub enum UpvarArgs<'tcx> {
context_after:     Coroutine(GenericArgsRef<'tcx>),