[GHC] #14691: Replace EvTerm with CoreExpr

[GHC]

#14691: Replace EvTerm with CoreExpr
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        Reporter:  nomeata           |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.3
  checker)                           |
      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):

 >  Given this, better to defer to the desugarer I think, to postpone any
 evidence-solving that requires bindings that might be generated in this
 very module.

 So should I try this:
 {{{
 data EvTerm = EvExpr CoreExpr | EvTypeable EvTypeable
 }}}


 This is differs from the state before, because now the `CoreExpr` in an
 `EvExpr` can no longer refer to an `EvTypeable`… I cannot tell yet if that
 would happen or if it is a problem.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14691#comment:21>
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