You had the wrong GHC version selected. That version has not been available for quite a while now. Closing.

Go translation, please check and approve.
https://www.codewars.com/kumite/5e6da4bd3fcf600012e7d6e5?sel=5e6da4bd3fcf600012e7d6e5

Getting the following error when attempting the Haskell solution after unit tests pass without problems:

FormatDurationSpec.hs:1:53:
    Not in scope: `main'
    Perhaps you meant `min' (imported from Prelude)

There really should be a test case that uses node values which are not Ord.

Thanks, done.

Code blocks in the description shouldn't have headers. When there are adjacent code blocks, only the block with a matching language is displayed in the description.
You can do withMaxSuccess, but don't call quickCheck explicitly because it doesn't use Codewars formatter and even failed tests are shown as passed this way.

Genius