Re: [Haskell-cafe] Array bug?

Andrew Coppin wrote:

Consider the following GHCi session:

GHCi, version 6.8.2: http://www.haskell.org/ghc/ :? for help Prelude Data.Array.IO> t <- newArray ((0,0),(5,4)) 0 :: IO (IOUArray (Int,Int) Int) Prelude Data.Array.IO> getBounds t ((0,0),(5,4)) Prelude Data.Array.IO>

Is this a known bug? Is it likely to be fixed any time soon? (I'm guessing the bug is as simple is converting indicies to integers and then checking the integers are in-range, rather than the underlying index type.)

Yes, it's a known bug - a conscious choice really. See http://hackage.haskell.org/trac/ghc/ticket/2120 It's somewhat ironic that this behaviour was introduced by a patch that made arrays safer to use in other respects. Bertram