#1259: Accessing undefined value in DiffArray returns misleading error message
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Reporter: guest | Owner:
Type: bug | Status: new
Priority: low | Milestone:
Component: libraries/base | Version: 6.6
Severity: normal | Keywords:
Difficulty: Easy (1 hr) | Testcase:
Architecture: Multiple | Os: Unknown
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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.
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1259>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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