[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):

 Ok, here is (part of) the deal:

  * `tcLookupGlobal :: Name -> TcM TyThing` looks things up in the global
 environment (`getGblEnv`). While compiling `Data.Typeable.Internal`,
 `mkTrCon` is not in the global environment.
  * If the lookup fails, it uses `notFound`, which, for some reason, prints
 the `tcl_env` of the *local* environment (`lcl_env <- getLclEnv`).
  * This shows us that `mkTrCon` is actually in the local environment! So
 presumably, we just have to use that.

 I would have expected that `tcLookup :: Name -> TcM TcTyThing` (no
 `Global` in the name) would consult the local environment. It seems to
 consult the local type environment (`local_env <- getLclTypeEnv`). But
 when I tried that (in
 http://git.haskell.org/ghc.git/commitdiff/cb7deb6d0f36132594ccad3c86bddc7d7cdbb0dd)
 it somehow did not help. Will have to try harder, I guess.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14691#comment:12>
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