On 10 July 2013 14:10, kudah <kudahkuka...@gmail.com> wrote: > Yes, it does. Without optimizations the result is > "ndgorsfesnywaiqraloa", while with optimizations the result is always > "aaaaaaaaaabbaaaaaaaa". > Sorry for taking so long. So problem is uniformR. You can reproduce bug reliably and I cannot. Are you on 32-bit system? I only tested on 64-bit ones. If this isn't the case I'm out of ideas.
I finally wrote test case that doesn't depends on anything besides mwc-random (it's in attachment). Could you check whether it still triggers the bug
testcase.hs
Description: Binary data
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