danburton / composition Goto Github PK

Hi,

I am getting

Failed to load interface for ‘Data.Composition’
It is a member of the hidden package ‘composition-1.0.2.1’.
Perhaps you need to add ‘composition’ to the build-depends in your .cabal file.
Use -v to see a list of the files searched for.

when I try to add the lib into my stakc.yaml and .cabal file.

, composition-1.0.2.1 in extra-deps:

and

, composition in build-depends:

Thanks for any advice.

-- | Function composition.
{-# INLINE (.) #-}
-- Make sure it has TWO args only on the left, so that it inlines
-- when applied to two functions, even if there is no final argument
(.) :: (b -> c) -> (a -> b) -> a -> c
(.) f g = \x -> f (g x)

The INLINE pragma and the definition with the right arity could be used
in Data.Composition as well, and it would yield the same results.

What package has conflicting operators that makes you declare 2 different operator .: .*?