[GHC] #13857: compactAdd doesn't work with SmallArray#

[GHC]

#13857: compactAdd doesn't work with SmallArray#
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           Reporter:  andrewthad     |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  high           |         Milestone:
          Component:  Runtime        |           Version:  8.2.1-rc2
  System                             |
           Keywords:  compact        |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 I get this when I try to compact a small array:

 {{{
 internal error: stg_compactAddWorkerzh: TODO: SMALL_MUT_ARR_PTRS
     (GHC version 8.2.0.20170404 for x86_64_unknown_linux)
     Please report this as a GHC bug:
 http://www.haskell.org/ghc/reportabug
 }}}

 If I look in `rts/Compact.cmm`, I can see that this hasn't been
 implemented. I haven't seen this in another issue, so I just wanted to
 make sure it was not overlooked before the 8.2 release.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13857>
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