[GHC] #10666: Distinguish between semantic module / identity module in TcGblEnv, ModIface and ModGuts

[GHC]

#10666: Distinguish between semantic module / identity module in TcGblEnv, ModIface
and ModGuts
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        Reporter:  ezyang            |                   Owner:  ezyang
            Type:  task              |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Package system    |                 Version:  7.10.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by simonpj):

 Can you give some examples (starting with the Backpack file I suppose) of
 when the behaviour of the two differs.  In particular, I don't know what
 "dependency analysis and tracking" means.  What shows up in interface
 files, for example?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10666#comment:1>
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