[GHC] #13859: Bad error message when compacting a Compact#

[GHC]

#13859: Bad error message when compacting a Compact#
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        Reporter:  andrewthad        |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.1-rc2
      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 andrewthad):

 Providing the closure type name would help me out a lot. I'm actually now
 in another situation where I'm getting the "cannot compact mutable
 objects" message, and it's difficult to track down what it actually is
 that's causing the problem. Granted, this is only happening because I'm
 trying to do things that you aren't really supposed to do with compact
 heap.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13859#comment:2>
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