On Mon, 2009-02-23 at 17:22 -0600, Louis Wasserman wrote:

In the documentation for Data.IntMap updateMin, a piece of example code both communicates incorrect intuition, and fails to even compile.

updateMin :: (a -> a) -> IntMap a -> IntMap a

updateMin (\ _ -> Nothing) (fromList [(5,"a"), (3,"b")]) -- code straight from the docs

<interactive>:1:49: Couldn't match expected type `Maybe a' against inferred type `[Char]' In the expression: "a" In the expression: (5, "a") In the first argument of `fromList', namely `[(5, "a"), (3, "b")]'

As a side note, the sort of operation implied by the example code was really what I was looking for in the documentation -- but such a method no longer exists in IntMap. ::sad::

Who do I tell this to / how do I ask to get it fixed?

Open a ticket in the ghc trac: http://hackage.haskell.org/trac/ghc/ set the component to "libraries other". Paste in your description and if you can, attach a darcs patch to the ticket. More generally, to work out where to send things check the hackage page. Most packages list a maintainer or author and some are now specifying a bug reports url. Currently for the containers package it's not all that helpful, it only lists a maintainer email address as libraries@haskell.org. Though that would also have been a place to start to get the above advice. The next release of all the core packages will also list their bug-report urls and these will appear on their hackage pages. Duncan