[GHC] #4900: DEPENDS pragma

[GHC]

#4900: DEPENDS pragma
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        Reporter:  cdsmith           |            Owner:
            Type:  feature request   |           Status:  patch
        Priority:  normal            |        Milestone:  7.8.1
       Component:  Compiler          |          Version:
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:  TH_Depends        |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by simonmar):

 I still need to review this patch carefully.  At first glance it's not
 obviously right, since we don't normally modify `ModSummary` during the
 upsweep - the `ModSummary` is something that is supposed to be collected
 by the downsweep.  But I don't have all the details in my head right now,
 I'll try to come back to this when I have more time.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4900#comment:63>
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