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 [email protected], 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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