[GHC] #12135: Failure to recompile when #include file is created earlier on include path

[GHC]

#12135: Failure to recompile when #include file is created earlier on include path
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        Reporter:  NeilMitchell      |                Owner:  ezyang
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Driver            |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by ezyang):

 * owner:   => ezyang


Comment:

 Fix is easy: we need to track files which are expected to be non-existent;
 starting with `hpm_src_files` all the way to `mi_usages`. I'll do a patch.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12135#comment:3>
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