[GHC] #13009: Hierarchical Module Structure for GHC

[GHC]

#13009: Hierarchical Module Structure for GHC
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           Reporter:  hsyl20         |             Owner:
               Type:  task           |            Status:  new
           Priority:  low            |         Milestone:
          Component:  Compiler       |           Version:  8.0.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
                                     |  ModuleDependencies/Hierarchical
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 Currently GHC's modules are not hierarchical and have very short cryptic
 names. I would like to revive this 8-year old proposal:
 https://ghc.haskell.org/trac/ghc/wiki/ModuleDependencies/Hierarchical

 Pros:
 * cleaner code base and overall code structure easier to grasp
 * better integration with other packages when using GHC API
 * better documentation (cf
 https://www.stackage.org/lts-7.14/package/ghc-8.0.1)

 Cons:
 * break the GHC (plugin) API
 * may make "rebase" harder during the transition period

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