[GHC] #7021: Tuple (and other exotic predicates) not yet handled in Template Haskell

[GHC]

#7021: Tuple (and other exotic predicates) not yet handled in Template Haskell
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        Reporter:        |            Owner:
  goldfire               |           Status:  new
            Type:        |        Milestone:  7.8.1
  feature request        |          Version:  7.5
        Priority:        |         Keywords:  ConstraintKinds
  normal                 |  TemplateHaskell
       Component:        |     Architecture:  Unknown/Multiple
  Template Haskell       |       Difficulty:  Unknown
      Resolution:        |       Blocked By:
Operating System:        |  Related Tickets:
  Unknown/Multiple       |
 Type of failure:        |
  None/Unknown           |
       Test Case:        |
        Blocking:        |
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Comment (by yoeight):

 That did help a lot, thanks !

 So, I (think) have implemented `IrredPred`. I have also fixed
 `DsMeta.lhs`, deleted `classP`, `equalP` and added `equalityT`

 Sadly, I have a failing test `testsuite/tests/perf/compiler/T4801.hs` and
 I don't know how to work this out

 Patches can be found [https://gist.github.com/YoEight/8370987 here]

 Regards,

 Yorick

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7021#comment:12>
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