Why does the following, trivial  code snippet below hang GHCi when I type

"Scalene > Failure", and what's the fix?

data Triangle                  =  Failure

                               |  Equilateral

                               |  Isosceles

                               |  Scalene

                               deriving (Eq, Show)

instance Ord Triangle where

    Failure     < Failure      = False

    Failure     < _            = True

    Equilateral < Failure      = False

    Equilateral < Equilateral  = False

    Equilateral < _            = True

    Isosceles   < Scalene      = True

    Isosceles   < _            = False

    Scalene     < _            = False

(I tried submitting this to beginners@haskell.org, but even though I've signed up for that mailing list, I got a bounce-back saying that I needed admin approval to submit anything to that list, and I haven't heard from an admin, so I'm posting it here.)

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