cmd.v_variables = xnrealloc (cmd.v_variables, cmd.n_variables,
sizeof *cmd.v_variables);
cmd.v_variables[cmd.n_variables - 1]
cmd.v_variables = xnrealloc (cmd.v_variables, cmd.n_variables,
sizeof *cmd.v_variables);
cmd.v_variables[cmd.n_variables - 1]