[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:  normal      |        Milestone:  7.10.1
             Component:  Compiler    |          Version:  6.12.2
            Resolution:              |         Keywords:
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Difficult (2-5
       Type of failure:  Other       |  days)
             Test Case:              |       Blocked By:
              Blocking:              |  Related Tickets:
Differential Revisions:              |
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Comment (by nomeata):

 Nice example. Here is the diff between such interface files.
 {{{
 -"SPEC $cshowsPrec_a2QX @ [GHC.Types.Char]" [ALWAYS] forall $dShow ::
 GHC.Show.Show
 +"SPEC $cshowsPrec_a2Q6 @ [GHC.Types.Char]" [ALWAYS] forall $dShow ::
 GHC.Show.Show
 [GHC.Types.Char]
 }}}
 It looks similar in 7.6.3 and in HEAD.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4012#comment:63>
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