[GHC] #13908: sameMutableArray equivalent for Array

[GHC]

#13908: sameMutableArray equivalent for Array
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        Reporter:  winter            |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      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 winter):

 In fact the code in the issue report is even problematic: if we thaw an
 array without freezing it. we may leave it on the mutable list forever. So
 we have to add it anyway. But currently doing that won't save us from next
 GC.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13908#comment:1>
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