That makes sense: the range ends up being
[5..4], which is a no-iteration loop. What do you think should be the output?
NB: my code does not run under 5.8.1 (on a Mac). I don't know why, and I can't get 5.8.6 to compile. Grrr. I hate it when my PC works better than my Mac.
Update: and to answer my own question, I looked at what NestedLoops does. Sensibly enough, it does no iterations when there's a no-iteration loop. You can get this behavior by making the last line of nest be return((@out and @in) ? (@out, @in) : ());
Caution: Contents may have been coded under pressure.
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