undo_enable
int undo_enable(int, int);
x = undo_enable(FFRAND, 0);
undo_enable(FFRAND, x);
x2 = undo_enable(FFRAND, 0);
undo_enable(FFRAND, x2);
undo_enable(FFRAND, x);
{undo_enable, "undo-enable", 0},