Hi Achim,

Yes, I'd expect these two defs to be equivalent.  Considering the combination of snapshot and external input, the problem might well be due to the ghc RTS bug (http://hackage.haskell.org/trac/ghc/ticket/2558) that has been plaguing unamb.  Simon Marlow says they have an RTS fix that fixes the test cases we'd sent, so I expect to be able to try it out soon.

Meanwhile, I'd like to make sure your symptom below gets captured, so we can confirm that the RTS fix takes care of it or otherwise dig further.  Would you please make a ticket on http://trac.haskell.org/reactive ? 

Thanks!  - Conal

On Wed, Jan 7, 2009 at 7:25 PM, Achim Schneider <barsoap@web.de> wrote:
Shouldn't

timeAtFramePass :: UI -> Event TimeT
timeAtFramePass i = snapshot_ time (framePass i)

and

timeAtFramePass = withTimeE_ . framePass


be equivalent? The final output of the first one seems to skip
occurrences (I don't think frames are truly skipped).

See http://hpaste.org/13746


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