Plan 9 from Bell Labs’s /usr/web/sources/contrib/fernan/nhc98/src/prelude/Prelude/Enum_Ordering.hs

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module Prelude(Enum(..)) where

import _EnumFromTo
import _EnumFromThen

instance Enum Ordering where
    fromEnum LT = 0
    fromEnum EQ = 1
    fromEnum GT = 2

    toEnum   0 = LT
    toEnum   1 = EQ
    toEnum   2 = GT

    enumFrom n        = _enumFromTo n 2
    enumFromThen n n' = _enumFromThen n n' 2


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