[GHC] #4012: Compilation results are not deterministic

[GHC]

#4012: Compilation results are not deterministic
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        Reporter:  kili              |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  high              |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  6.12.2
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Other             |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by Fuuzetsu):

 Austin, is there a reason why we're punting to 7.12? Joachim's patch
 doesn't affect the main complaint I had with 7.10 which was the
 pure/return specialisation stuff. I even said above

 >But I also don't want to hold up any other fixes. I wish only to not end
 up in a situation where the final 7.10.x is released and to get much else
 in we have to wait for 7.12. As long as it's fixed in 7.10 somewhere, I'm
 happy.

 To us (nix), it's really not acceptable that we have to daily tell users
 to delete their packages and just try again praying that this time around
 something more consistent comes up.

 puffnfresh, yes, great, very useful, big part of this ticket as a whole is
 to even find out what breaks.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4012#comment:92>
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