[GHC] #14391: Make the simplifier independent of the typechecker

[GHC]

#14391: Make the simplifier independent of the typechecker
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        Reporter:  nomeata           |                Owner:  ulysses4ever
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.3
      Resolution:                    |             Keywords:  newcomer
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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Changes (by ulysses4ever):

 * owner:  (none) => ulysses4ever


Comment:

 I have one more question about `tcLookupGlobal` (hope the last one for
 it). Here its part:
 {{{
 if nameIsLocalOrFrom (tcg_semantic_mod env) name
 then notFound name  -- Internal names can happen in GHCi
 else
 }}}
 I have trouble with `notFound` part which essentially does careful error-
 reporting inside `Tc` monad. I'm lost on how to port this to IO with the
 same amount of precision. So far I come up with dumb solution (to be
 placed in the `then` branch):
 {{{
 pprPanic "lookupGlobal" (ppr name)
 }}}
 It is probably not good enough. Or is it?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14391#comment:13>
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