#1691: Data.Map.deleteAt broken with index 0
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Reporter: guest | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: libraries/base | Version: 6.6.1
Severity: normal | Keywords:
Difficulty: Unknown | Os: Linux
Testcase: | Architecture: x86
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Take a look at this ghci session:
{{{
Prelude> :m Data.Map
Prelude Data.Map> Data.Map.deleteAt 0 (Data.Map.fromList [(0::Int,
0::Int), (1,1), (2, 2), (3, 3)])
fromList []
Prelude Data.Map> Data.Map.elemAt 0 (Data.Map.fromList [(0::Int, 0::Int),
(1,1), (2, 2), (3, 3)])
(0,0)
}}}
In other words, deleteAt with index 0 deletes *everything* in the map, not
just the first element in it.
{{{
Prelude Data.Map> Data.Map.deleteAt 1 (Data.Map.fromList [(0::Int,
0::Int), (1,1), (2, 2), (3, 3)])
fromList [(0,0),(2,2),(3,3)]
}}}
That appears to work as it should. It seems that there is something wrong
with an index of 0.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1691>
GHC <http://www.haskell.org/ghc/>
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