[GHC] #4955: increase error message detail for module lookups failure due to hi references

[GHC]

#4955: increase error message detail for module lookups failure due to hi
references
-------------------------------------+-------------------------------------
              Reporter:  duncan      |            Owner:
                  Type:  feature     |           Status:  new
  request                            |        Milestone:  7.10.1
              Priority:  low         |          Version:  6.12.1
             Component:  Package     |         Keywords:
  system                             |     Architecture:  Unknown/Multiple
            Resolution:              |       Difficulty:  Unknown
      Operating System:              |       Blocked By:
  Unknown/Multiple                   |  Related Tickets:
       Type of failure:              |
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------
Changes (by thomie):

 * difficulty:   => Unknown
 * component:  Compiler => Package system
 * type:  bug => feature request


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4955#comment:6>
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