{"ast_node_type":"variable","tokens":[{"end":89,"kind":"keyword","start":0,"text":"let"}]}
            let instance = Instance::mono(tcx, tcx.require_lang_item(lang_item, source));
        let push_mono_lang_item = |this: &mut Self, lang_item: LangItem| {
            if tcx.should_codegen_locally(instance) {