syntax_data: {"ast_node_type":"other","tokens":[{"end":63,"kind":"keyword","start":0,"text":"parent_closure_args.coroutine_captures_by_ref_ty(),"}]}
source_snippet:             parent_closure_args.coroutine_captures_by_ref_ty(),
context_before:             parent_closure_args.tupled_upvars_ty(),
context_after:         );