[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:  (none)
            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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Comment (by ulysses4ever):

 One more question. Consider a part of `tcImportDecl_maybe`:
 {{{
 initIfaceTcRn (importDecl name)
 }}}
 You said that it is necessary to create a variant of `initIfaceTcRn`. That
 sounds fine. But here is another thing: `importDecl` has `IfM` in its
 type. And `IfM` is defined in `TcRnTypes`, so leaving it doesn't bring us
 decoupling from the typechecker. Should we also replace `importDecl`? This
 sounds like a lot of work, because it depends on `loadInterface` which is
 >100 LOCs.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14391#comment:9>
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