{"ast_node_type":"other","tokens":[{"end":52,"kind":"keyword","start":0,"text":"args.coroutine_captures_by_ref_ty(),"}]}
                args.coroutine_captures_by_ref_ty(),
                args.tupled_upvars_ty(),
                self.infcx.next_region_var(RegionVariableOrigin::Misc(self.body.span), || {