As noted above - with ridiculously large values for ab this one crashes (although I didn't compile with O-parameters). I think this (and the other haskell solution) ran out of resources.

Both the go and nodejs versions completed without problems.

I was a little disappointed -- I was actually hoping I'd see comparable performance -- even if it is a silly test.

I think it is interesting that simple, idomatic code in go and nodejs didn't crash -- not sure what assumptions might be "wrong" in the underlying haskell code (I'm guessing if anything should be "fixed" it is in the web server libraries used).