As the question states, I have some that compiles in leksah but does not compile using ghc --make filename.hs
The code:
module Main (
main
) where
pair a b = (Pair (a, b))
newtype Pair a b = Pair (a,b) deriving (Eq,Show)
instance (Num a,Num b) => Num (Pair a b) where
Pair (a,b) + Pair (c,d) = Pair (a+c,b+d)
Pair (a,b) * Pair (c,d) = Pair (a*c,b*d)
Pair (a,b) - Pair (c,d) = Pair (a-c,b-d)
abs (Pair (a,b)) = Pair (abs a, abs b)
signum (Pair (a,b)) = Pair (signum a, signum b)
fromInteger i = Pair (fromInteger i, fromInteger i)
main = do
a <- return (pair 1 3)
print a
print "haha"
print 3.2
print [3,4,3]
Is there an option I need to invoke to make it run with ghc --make
?
Disclaimer: I did not make the pair newtype.
Edit:
When using ghc --make Bignumber.hs
(Bignumber.hs is the filename) the output is
[1 of 1] Compiling Main ( BigNumber.hs, BigNumber.o )
BigNumber.hs:20:13: parse error on input `print'
Check your indentation: maybe you're mixing tabs and spaces in a way that ghc interprets differently than leksah? I don't see another explanation for a parse error at print
.