CODEWITHSUNDEEP
haskell
Swap D
Swap D

Reputation: 93

How do I prevent default implementation of exponential operator (^)

I am new to haskell and I am getting an error when compiling the following code

(^) :: Int -> Int -> Int
_ ^ 0 = 1
x ^ n = x * (x ^ (n-1))

The error is this:

Ambiguous occurrence `^'
It could refer to
either `Prelude.^',
imported from `Prelude' at test.lhs:1:1
(and originally defined in `GHC.Real')
or `Main.^', defined at test.lhs:107:5

Upvotes: 1

Views: 57

Answers (1)

Enlico
Enlico

Reputation: 28416

Long story short, Prelude has that function already and you are redefining it, so the compiler doesn't know which one to pick.

If you put

import Prelude hiding ((^))

on the top of your file, you'll resolve the ambiguity in favour of your definition by hiding the other one from the Prelude.

Upvotes: 5

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