{"ast_node_type":"variable","tokens":[{"end":90,"kind":"keyword","start":0,"text":"if"}]}
            if let ty::Adt(struct_def, args) = instance.ty(cx.tcx, cx.typing_env()).kind()
            let instance = Instance::mono(cx.tcx, def_id);
                && cx.tcx.is_lang_item(struct_def.did(), LangItem::Option)