{"ast_node_type":"other","tokens":[{"end":50,"kind":"keyword","start":0,"text":"err.span_label(trait_header_span,"}]}
            err.span_label(trait_header_span, "");
            let trait_header_span = tcx.def_ident_span(tcx.parent(trait_item.def_id)).unwrap();
            err.span_label(param_trait_span, make_param_message("expected", param_trait));