Re: [Haskell-cafe] Performance with do notation, mwc-random and unboxed vector

On Wed, Jun 13, 2012 at 12:56 AM, Roman Leshchinskiy wrote:

It doesn't change the semantics of your program but it can make it significantly slower (or faster, as in this case). The various state hack related tickets on trac might give you an idea of what is happening here.

I filed a bug: http://hackage.haskell.org/trac/ghc/ticket/6166 (I'd CC myself on an existing bug, but trac's search feature gives me tons of irrelevant hits.)