I cannot import module Data.Colour, and the error as follow:
Could not find module `Data.Colour’
Use -v to see a list of the files searched for.
Failed, modules loaded: none.
Am I missing anything?
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A Hayoo! search reveals that this module lives in the colour package, which you presumably don’t have installed. To install it, run
cabal updatefollowed bycabal install colour.