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Technically the behaviour of sortWith has changed, as it used
    x `le` y = get_key x < get_key y
(note "<" rather than "<="), but I assume that that was just a mistake.

We can now rely on it being available from Data.Function

This completes the support for generic programming introduced
in GHC 7.2. Generic1 allows defining generic functions that
operate on type containers, such as `fmap`, for instance.

Along the way we have fixed #5936 and #5939, allowing
deriving Generic/Generic1 for data families, and disallowing
deriving Generic/Generic1 for instantiated types.

Most of this patch is Nicolas Frisby's work.

Fixes http://hackage.haskell.org/trac/ghc/ticket/5992

See the discussion in Trac #4361.  The change fixes
a regression in test IPRun.

Also, -read-dot-ghci is now gone. We now have -no-ignore-dot-ghci
instead.

It isn't really an option at all

Patch by Samuel Thibault.

See http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=659530.