[GHC] #13261: Consider moving Typeable evidence generation wholly back to solver

[GHC]

#13261: Consider moving Typeable evidence generation wholly back to solver
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        Reporter:  bgamari           |                Owner:
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              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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Comment (by simonpj):

 I have no fixed objection to doing it on the fly.  But then we'd probably
 want some way to avoid repeatedly generating the same stuff, some kind of
 on-the-fly CSE....

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13261#comment:3>
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