+
+ loop->index_var = dict_lookup_var (dataset_dict (ds), lex_tokcstr (lexer));
+ if (loop->index_var != NULL)
+ *created_index_var = false;
+ else
+ {
+ loop->index_var = dict_create_var_assert (dataset_dict (ds),
+ lex_tokcstr (lexer), 0);
+ *created_index_var = true;
+ }