[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 nomeata):

 Can we do it like specializations: Create on the fly the first time we
 need them, but use an existing one if any dependency already created them?
 (Maybe this is what Simon means by on-the-fly CSE).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13261#comment:4>
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