{"ast_node_type":"other","tokens":[{"end":81,"kind":"keyword","start":0,"text":"cx.require_lang_item(TraitSolverLangItem::AsyncFnKindHelper);"}]}
                    cx.require_lang_item(TraitSolverLangItem::AsyncFnKindHelper);
                let async_fn_kind_trait_def_id =
                // When we don't know the closure kind (and therefore also the closure's upvars,