{"ast_node_type":"other","tokens":[{"end":91,"kind":"keyword","start":0,"text":"err.subdiagnostic(SuggestBoxingForReturnImplTrait::BoxReturnExpr"}]}
        err.subdiagnostic(SuggestBoxingForReturnImplTrait::BoxReturnExpr { starts, ends });
            arm_spans.map(|span| (span.shrink_to_lo(), span.shrink_to_hi())).unzip();
    }