[GHC] #13148: Adding weak pointers to non-mutable unboxed values segfaults

[GHC]

#13148: Adding weak pointers to non-mutable unboxed values segfaults
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        Reporter:  mboes             |                Owner:
            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 rwbarton):

 > Is the rule that the first argument to this function is valid iff it is
 of unlifted (primitive) type? If so, I think it would be useful to
 document that there.

 I think the rule is probably that the argument must be of boxed type.
 Surely it must be necessary; not sure whether it is also sufficient.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13148#comment:4>
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