Useful alternative control structures?

Question

Sometimes when I am programming, I find that some particular control structure would be very useful to me, but is not directly available in my programming language. I think my

Answer 1

for int i := 0 [down]to UpperBound() [step 2]

Missing in every C-derived language.

Please consider before you vote or write a comment:
This is not redundant to for (int i = 0; i <= UpperBound(); i++), it has different semantics:

1. UpperBound() is evaluated only once

2. The case UpperBound() == MAX_INT does not produce an infinite loop