problem compiling an older Haskell program with GHC 6.6.1

[Stefan O'Rear]

On Sat, Jul 07, 2007 at 03:59:48PM -0400, Scott Stoller wrote:
> hi,
> 
> I really appreciate the amazingly fast and helpful feedback to my previous
> message.  that problem (FiniteMap not found) is solved.  but a new problem
> came up...
> 
> I am trying to compile paradox 1.0, an older (GHC 5) Haskell program, 
> with GHC 6.6.1 (the Solaris 10 / x86 binary distribution).
> 
> now I get the error
> 
>   Data.hs:760:20: Not in scope: 'bounds'
> 
> Data.hs is one of the files in the program.  here is the nearby code:
> 
> updateTable :: Hash a => a -> IO b -> Table a b -> IO b
> updateTable x my (MkTable ref) =
>   do MkHTab n arr <- readIORef ref
>      let (_,size) = bounds arr
>          hashx    = hash x
>          i        = hashx `mod` size
>   ...
> 
> in case it's helpful, the entire paradox source code is at
> http://www.cs.sunysb.edu/~stoller/out/paradox-1.0-casc.tar.gz
> just delete "-package lang" from the Makefile before running "make".

Bounds was removed in 6.4.x to allow for dynamically sized arrays; it
should work as:

updateTable :: Hash a => a -> IO b -> Table a b -> IO b
updateTable x my (MkTable ref) =
  do MkHTab n arr <- readIORef ref
     (_,size) <- getBounds arr
     let hashx    = hash x
         i        = hashx `mod` size

Stefan