for (i=0,j=n-1; i < n; j=i++) { ... } (just reminded of this trick by @cmuratori)
@thomask77 @nothings Any enumeration with a non-trivial wrap where you need the current and prev and/or next index in the loop.
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@thomask77 @nothings Any enumeration with a non-trivial wrap where you need the current and prev and/or next index in the loop.