Haskell Binary Search Problem always shows error

Hi, there seems to be a bug in haskell’s binary search problem https://exercism.org/tracks/haskell/exercises/binary-search. I even tried the posted correct answer, and always ends up with error.
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I can replicate this on Binary Search, but not Allergies. So this might be something exercise-specific for the maintainers to look at.

CC @tofische @MatthijsBlom

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