[GHC] #14691: Replace EvTerm with CoreExpr

[GHC]

#14691: Replace EvTerm with CoreExpr
-------------------------------------+-------------------------------------
        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:                    |
-------------------------------------+-------------------------------------

Comment (by nomeata):

 I was using `lookupName` previously, from the `MonadThings` instance,
 which goes through `tcLookupGlobal`; I believe that is the cause for the
 bizarriness:
 {{{
 instance MonadThings (IOEnv (Env TcGblEnv TcLclEnv)) where
     lookupThing = tcLookupGlobal
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14691#comment:15>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler