{"ast_node_type":"other","tokens":[{"end":56,"kind":"keyword","start":0,"text":"cgu_dst.items_mut().append(cgu_src.items_mut());"}]}
        cgu_dst.items_mut().append(cgu_src.items_mut());
        // unaffected. Recalculate size estimates afterwards.
        cgu_dst.compute_size_estimate();