syntax_data: {"ast_node_type":"other","tokens":[{"end":43,"kind":"keyword","start":0,"text":"CoroutineClosure(GenericArgsRef<'tcx>),"}]}
source_snippet:     CoroutineClosure(GenericArgsRef<'tcx>),
context_before:     Coroutine(GenericArgsRef<'tcx>),
context_after: }