patch applied (ghc): Fix Trac #2999: change an ASSERT to a WARN

[Simon Peyton Jones]

Wed Feb  4 00:38:00 PST 2009  simonpj at microsoft.com
  * Fix Trac #2999: change an ASSERT to a WARN
  Ignore-this: db6fdc200a06ba5f067d567ea64f89e1
  
  A bug in the constraint simplifier means that an equality can be solved
  twice.  It's harmless, and will go away with the new constraint simplifier.
  Hence warning, to avoid unnecessary outright failure on eg Trac #2999.
  

    M ./compiler/typecheck/TcTyFuns.lhs -1 +10

View patch online:
http://darcs.haskell.org/ghc/_darcs/patches/20090204083800-1287e-06110f4382c8ccb0214577ac0f036e1b1ef3f626.gz