[GHC] #8322: Report all missing module, not just the first or last

[GHC]

#8322: Report all missing module, not just the first or last
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        Reporter:  nomeata           |            Owner:  nomeata
            Type:  feature request   |           Status:  patch
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.6.3
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Changes (by nomeata):

 * status:  new => patch


Comment:

 I did a round of self-code-review and made the code a bit nicer. I believe
 this can be merged now. Can someone review and me the green light? I?ll
 then push and push the test suite accordingly (`tcfail082` needs
 updating).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8322#comment:2>
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