[Haskell-beginners] weird constraint

[Dimitri DeFigueiredo]

Could someone help me make sense of this Num constraint given by GHCi?
I was expecting to get:

inc . const :: Num a => a -> b -> a

rather than:

inc . const :: Num (b -> a) => a -> b -> a

Here's the transcript:


GHCi, version 8.6.3: http://www.haskell.org/ghc/  :? for help
Prelude> inc x = x + 1
Prelude> :t inc
inc :: Num a => a -> a
Prelude> :t const
const :: a -> b -> a
Prelude> :t inc . const
inc . const :: Num (b -> a) => a -> b -> a
Prelude>


Thanks,

Dimitri

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