Fwd: [Haskell-cafe] FunPtr error?

So Luke .. how do I go from (Sigval -> ()), i..e notifyFunc, to FunPtr using the suggested data constructors? On Sun, Jun 8, 2008 at 10:01 PM, Luke Palmer wrote:

2008/6/8 Galchin, Vasili :

...

Hello,

I am getting what is to me a mysterious error in a test case that I am writing: vigalchin@ubuntu:~/FTP/Haskell/unix-2.2.0.0/tests/timer$ runhaskell Setup.lhs build Preprocessing executables for Test-1.0... Building Test-1.0... [1 of 1] Compiling Main ( ./timer.hs, dist/build/timer/timer-tmp/Main.o )

./timer.hs:11:45: Not in scope: data constructor `FunPtr'

There is a *type* called FunPtr in scope, but not a data constructor as you are using it. That is, you could say:

foo :: FunPtr (Int -> IO ())

That is, use the type called FunPtr, but you may not use a *function* called FunPtr, because it doesn't exist. You need to use functions like nullFunPtr, castPtrToFunPtr, etc. to construct FunPtrs.

Luke