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

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Distributed under the MIT License.
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module Prelude where

import _FromEnum
import _EnumInRange

_enumIndex :: String -> (a,a) -> a -> Int
_enumIndex msg b@(c,c') ci
   | _enumInRange b ci = _fromEnum ci - _fromEnum c
   | True              = error ("Ix." ++ msg ++ ".index: Index out of range.")

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