Wed Jul 18 08:03:40 PDT 2007 Bertram Felgenhauer <int-e at gmx.de>
* fix Data.Map.updateAt
See http://haskell.org/pipermail/libraries/2007-July/007785.html for a piece
of code triggering the bug. updateAt threw away parts of the tree making up
the map.
M ./Data/Map.hs -2 +2