[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:  closed
        Priority:  normal            |            Milestone:
       Component:  Package system    |              Version:  7.10.1
      Resolution:  invalid           |             Keywords:
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 ezyang):

 * status:  new => closed
 * resolution:   => invalid


Comment:

 There's some examples on the wiki page: wiki:Backpack

 But I've figured out how to do this non-invasively, so this will just be
 part of the Backpack omnibus patch, when it lands.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10666#comment:2>
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