{"ast_node_type":"other","tokens":[{"end":100,"kind":"keyword","start":0,"text":"ty::TraitRef::new(tcx,"}]}
                ty::TraitRef::new(tcx, tcx.require_lang_item(LangItem::AsyncDrop, span), [drop_ty]);
            let trait_ref =
            let (drop_trait, trait_args) = match tcx.codegen_select_candidate(