[GHC] #13102: orphan family instances can leak through the EPS in --make mode

[GHC]

#13102: orphan family instances can leak through the EPS in --make mode
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        Reporter:  rwbarton          |                Owner:  rwbarton
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 >  But I think the real intent is ...

 No, not really.  You'll see a lot of calls to `checkWiredInTyCon` whose
 solve purpose is to ensure that that the home module for the wired-in type
 constructor is loaded, even if you don't need to import the module to
 bring it into scope.

 In the example you give,

 > The literal [True] means GHC.Exts.fromListN 1 (True : [])

 OK, but `fromListN` is a known-key `Name` but it is not a wired-in `Id`.
 So to get `fromListN`'s type GHC is forced to load `GHC.Exts.hi`.

 So I don't see the problem.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13102#comment:12>
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