Two things. First, you need a module name. So prefix your code with 'module Foo where'. Secondly, the call to ghc needs -fglasgow-exts to pick up the necessary extensions.
-- Hal Daume III "Computer science is no more about computers | [EMAIL PROTECTED] than astronomy is about telescopes." -Dijkstra | www.isi.edu/~hdaume On 19 Oct 2002, [ISO-8859-1] Jo�o Ferreira wrote: > Hello all, > > I am trying to learn how to use FFI with GHC. I've tried the example in > GHC's user's guide but it didn't worked. Here it is: > > > 1) The haskell code > =================== > > [bracaman@tucano hib]$ cat foo.hs > foreign export ccall foo :: Int -> IO Int > > foo :: Int -> IO Int > foo n = return (length (f n)) > > f :: Int -> [Int] > f 0 = [] > f n = n:(f (n-1)) > > 2) The error > ============ > > [bracaman@tucano hib]$ ghc -c foo.hs > foo.hs:3: Type signature given for an expression > [bracaman@tucano hib]$ > > > I just can't understand why this is happening... can someone, please, > help? > > Thank you in advance, > Jo�o Ferreira > > _______________________________________________ > Haskell-Cafe mailing list > [EMAIL PROTECTED] > http://www.haskell.org/mailman/listinfo/haskell-cafe > _______________________________________________ Haskell-Cafe mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell-cafe
