Hugs-Bugs

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October 2002

24 participants
32 discussions

Hugs Crashes W2K
by ion 07 Oct '02

07 Oct '02

Hug's crashes when I try to use the 'prime' function defined below, note that the function calls prime_helper and this is the likely cause of the crash, also note that the reason for the crash is probable error in the function definition. This is on Windows 2000, is there a fix for this (apart from, "don't use windows" ;)) as otherwise the tool is unusable? ion -- Checks whether or not a given Integer is prime prime:: Integer -> Integer prime x = if x==0 then error "x = 0" else if x<0 then prime (0-(-x)) else prime_helper x 2 -- Used within 'prime' to determine if a number is prime or not prime_helper:: Integer -> Integer -> Integer prime_helper x y = if ((rem) x y)==0 then error "NUMBER IS NOT PRIME" else if x==y-1 then error "NUMBER IS PRIME" else prime_helper x y+1

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mdo-trex stuff
by Levent Erkok 04 Oct '02

04 Oct '02

I was experimenting with the qualified names and mdo-trex stuff. Found out the following: 1. The following code should work with all import variants. It "used" to work with the third variant only Right now, it doesn't work with any of them! ---------------------------------------------------------------- -- should work with all forms of import below: -- import qualified Trex as Tr -- import qualified Trex import Trex t = let r1 = (a=True,b=False) r2 = (b=False,a=True) in r1 == r2 ---------------------------------------------------------------- I guess functionality similar to "mdoLoad()" is required to handle the trex case correctly as well. Note: if you type a similar expression at top-level interpreter, then it works. 2. If you simply do: hugs -98 /usr/local/src/hugs98/lib/hugs/Trex.hs you get a weird error. 3. We've nuked MonadRec.hs from sources, but Siggy's new code works with both MonadRec and Control.Monad.Fix. Either we should add MonadRec back to lib/exts, or just not support the old naming anymore. (I'm not sure what's the right thing there.) -Levent.

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