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  • #1259

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Opened Apr 02, 2007 by guest@trac-guest
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Accessing undefined value in DiffArray returns misleading error message

Prelude> :m + Data.Array.Diff
Prelude Data.Array.Diff> :t array
array :: (Ix i, IArray a e) => (i, i) -> [(i, e)] -> a i e
Prelude Data.Array.Diff> array (1,1) [] :: DiffArray Int Int
array (1,1) [(1,*** Exception: MArray: undefined array element

Since DiffArray isn't a MArray(it implements IArray), this is misleading. It should either say IArray or better DiffArray: undefined array element.

Edited Mar 09, 2019 by Ian Lynagh <igloo@earth.li>

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bug core libraries P::normal Trac import
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Reference: ghc/ghc#1259