In languages without this feature (most of them), you sometimes see long blocks get labeled at the end anyway. On the other hand, you could argue that if your block is long enough it doesn't fit on the screen, then it should be its own function anyway.
Like this, except replace "..." with many lines of code.
if (z.p == z.p.p.left) {
...
} else { // z.p != z.p.p.left
...
} // if
