[Haskell-cafe] Potential problem with AC-Vector-Fancy package

Andrew Coppin andrewcoppin at btinternet.com
Fri Aug 12 19:22:58 CEST 2011

>> I think I have found a problem with the union function:
>> If you look here: http://hpaste.org/49889
>> You will see that line 4 gives a different result to lines 6, 8, 10;
>> this shouldn't be the case because union is commutative.
> AC-Vector-Fancy is merely a "fancy" facard over AC-Vector. So the bug is
> actually with AC-Vector.
> Looking at my source code, the true bug is in Data.BoundingBox.Range
> [which provides the engine that all the other bounding box types use).
> The actual bug turns out to by face-slappingly stupid: it's a typo in
> one of the variable names.
> I'll go get that fixed... and then maybe write some QuickCheck properties.

I just updated AC-Vector 2.3.2, which fixes the bug. Sorry about that... 
Let me know if you find any other stupid mistakes. (Or even clever ones, 
but I rather doubt that!)

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