The reply from bebyx is helpful, but the solution which made my implementation pass is hacky and not something I would expect to see in the real world ever.

idk how that one slipped by

.

Indeed, the names should be maximum' and minimum'.

EDIT

I also thought it's a kata bug at first, but there's actually a workaround for name ambiguousness built into the language. You can refer to the Haskell wiki.

What I would add, however, is that this kata is most likely 7, not 8. Also, using the named workaround is definitely not a good practice in real world, which my first version of the comment points out.

Although there might be barrier among languages, they should not be compared against each other. This is basically the same case for solvers complaining about accessing C pointers and what not. Plus, ranks can't be changed