[GHC] #13019: 'stack upgrade' failed with the message "ghc: panic! (the 'impossible' happened)"

[GHC]

#13019: 'stack upgrade' failed with the message "ghc: panic! (the 'impossible'
happened)"
-------------------------------------+-------------------------------------
        Reporter:  welf              |                Owner:
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.3
      Resolution:  duplicate         |             Keywords:  stack upgrade
Operating System:  MacOS X           |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #12479            |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by mpickering):

 * status:  new => closed
 * resolution:   => duplicate
 * related:   => #12479


Comment:

 This has been fixed. See #12479 for the details.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13019#comment:1>
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