data.depth = isl_ast_build_get_depth(build);
data.piece = domain_list->p;
g = isl_tarjan_graph_init(ctx, n, &domain_follows_at_depth, &data);
data.depth = isl_ast_build_get_depth(build);
data.piece = domain_list->p;
g = isl_tarjan_graph_init(ctx, n, &domain_follows_at_depth, &data);