[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 akio):

 Here is one example where the interface changes while there is no code
 change at all. On my computer (with GHC 7.8.3 on Linux), the attached
 shell script compiles Main.hs 4 times rather than just once. B.hi seems to
 contain some rules whose name is not stable.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4012#comment:61>
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