[GHC] #8426: one-shot compilation + TH doesn't see instances that is seen in batch mode

[GHC]

#8426: one-shot compilation + TH doesn't see instances that is seen in batch mode
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              Reporter:  errge       |            Owner:
                  Type:  bug         |           Status:  infoneeded
              Priority:  normal      |        Milestone:  7.12.1
             Component:  Template    |          Version:  7.7
  Haskell                            |         Keywords:
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Moderate (less
  Unknown/Multiple                   |  than a day)
       Type of failure:  Other       |       Blocked By:
             Test Case:              |  Related Tickets:  #7867
              Blocking:              |
Differential Revisions:              |
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Changes (by thoughtpolice):

 * status:  patch => infoneeded
 * milestone:  7.10.1 => 7.12.1


Comment:

 Gergley, sorry for dropping this patch on the floor. As you can tell since
 last year a lot has changed! Can you please rebase these patches? I also
 vaguely remember you wrote a wiki page about what they all addressed.
 Thanks!

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8426#comment:9>
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