syntax_data: {"ast_node_type":"other","tokens":[{"end":62,"kind":"keyword","start":0,"text":"args.as_coroutine_closure().parent_args(),"}]}
source_snippet:                     args.as_coroutine_closure().parent_args(),
context_before:                     tcx,
context_after:                     tcx.coroutine_for_closure(def_id),