[GHC] #8144: Interface hashes include time stamp of dependent files (UsageFile mtime)

[GHC]

#8144: Interface hashes include time stamp of dependent files (UsageFile mtime)
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              Reporter:  nh2         |            Owner:
                  Type:  bug         |           Status:  infoneeded
              Priority:  normal      |        Milestone:  7.10.1
             Component:  Compiler    |          Version:  7.6.3
            Resolution:              |         Keywords:  testcase
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:  Compile-    |       Blocked By:
  time performance bug               |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Changes (by thoughtpolice):

 * status:  patch => infoneeded
 * milestone:   => 7.10.1


Comment:

 Niklas, can you please rebase this patch? I manually did it, but then the
 test started failing (the `.stdout` file had "compilation IS NOT required"
 once too many times). Can you please take this and verify it should work?
 Thanks!

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8144#comment:28>
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