I started to update documentation for Data.IntMap. I
found a discrepancy between the modules'
updateLookupWithKey behavior right in the area brought
to my attention earlier:
--- Andriy Palamarchuk
* As per
http://www.haskell.org/pipermail/libraries/2007-March/007304.html
added following information to the description of updateLookupWithKey:
The function returns changed value, if it is updated. Returns the original key value if the map entry is deleted.
The test case:
:m Data.Map let f k x = if x == "a" then Just ((show k) ++ ":new a") else Nothing updateLookupWithKey f 5 (fromList [(5,"a"), (3,"b")])
(Just "5:new a",fromList [(3,"b"),(5,"5:new a")])
:m Data.IntMap updateLookupWithKey f 5 (fromList [(5,"a"), (3,"b")])
(Just "a",fromList [(3,"b"),(5,"5:new a")]) The problem here is that Data.Map.updateLookupWithKey returns the *updated* value, but Data.IntMap.updateLookupWithKey returns the value *before* update. Please agree on the behavior, fix the bug and let me know what to write in the docs. Thanks, Andriy __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com