[GHC] #12488: Explicit namespaces doesn't enforce namespaces

[GHC]

#12488: Explicit namespaces doesn't enforce namespaces
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        Reporter:  mpickering        |                Owner:  ruperthorlick
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      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 ruperthorlick):

 Replying to [comment:1 mpickering]:
 > Simon says that we should just reject the use of explicit namespace
 qualifiers in the subcomponents of the export item in the parser.
 >

 This would work and be a fairly easy change, however I stumled across the
 following in DynFlags.hs:

 {{{
 -- We turn this on so that we can export associated type
 -- type synonyms in subordinates (e.g. MyClass(type AssocType))
 , (LangExt.TypeFamilies,     turnOn, LangExt.ExplicitNamespaces)
 }}}

 So for the above they might want to export `Foo (type A)`

 Does this mean we need something more complicated?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12488#comment:3>
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