[Haskell-beginners] change to wikibook?

[Ashley Smith]

I was wondering if someone could explain this error? I typed in the sample
code from the Haskell Beginning Wikibook to define a function for absolute
value. I have GHC 7.0.4 for OSX. The error went away when I put parentheses
around the negative value, so did the Haskell interpreter think I was
entering - and a second argument, namely 10, when the parentheses weren't
there? Thank you!

*Main> let abs x = if x < 0 then -x else x
*Main> abs 5
5
*Main> abs -10

And got the following error
<interactive>:1:6:
    No instance for (Num (a0 -> a0))
      arising from the literal `10'
    Possible fix: add an instance declaration for (Num (a0 -> a0))
    In the second argument of `(-)', namely `10'
    In the expression: abs - 10
    In an equation for `it': it = abs - 10
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