> If by this you mean that you are wondering how often bugs in Haskell programs make it to production, the answer seems to be "at about the same rate as bugs in C or Java, as far as we can tell".

I think this is worded deceptively. Bug counts are about the same when measured as bugs per line of code. A line of code in Haskell can do quite a bit more than a line of code in C or Java. I think that's a meaningful difference.