[GHC] #13009: Hierarchical Module Structure for GHC

[GHC]

#13009: Hierarchical Module Structure for GHC
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        Reporter:  hsyl20            |                Owner:  hsyl20
            Type:  task              |               Status:  patch
        Priority:  low               |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3647
       Wiki Page:                    |
  ModuleDependencies/Hierarchical    |
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Comment (by hvr):

 Do we have numbers on how many packages actually directly depend on `ghc`
 (i.e. reverse deps) and thus actually suffer from the namespace clash?
 There's also the option to have a pure reexporting package which uses
 Cabal's feature to reexport modules at the cabal level under a different
 name: ModuleReexports; that way we could experiment with a new hierarchy
 without having to commit to it just yet. And once we're convinced we could
 do a physical reshuffling.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13009#comment:5>
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