{"ast_node_type":"other","tokens":[{"end":88,"kind":"keyword","start":0,"text":".with_span_label(tcx.def_span(did),"}]}
            .with_span_label(tcx.def_span(did), "should be the internal language item");
            .with_note("Rustc requires this item to have a specific mangled name.")
        if let Some(lang_item) = lang_item