[GHC] #12944: ghc master (8.1.20161206) panics with assertion failure with devel2 flavor and -O

[GHC]

#12944: ghc master (8.1.20161206) panics with assertion failure with devel2 flavor
and -O
-------------------------------------+-------------------------------------
        Reporter:  pacak             |                Owner:
            Type:  bug               |               Status:  merge
        Priority:  highest           |            Milestone:  8.0.3
       Component:  Compiler          |              Version:  8.1
  (CodeGen)                          |
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Compile-time      |            Test Case:
  crash or panic                     |  deSugar/should_compile/T12944
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2844
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by simonpj):

 * status:  closed => merge
 * milestone:  8.2.1 => 8.0.3


Comment:

 The main patch here, in comment:13, is a candidate for 8.0.3 since it
 fixes an outright bug.

 So I'll switch to merge status.  But it may depend (in a trivial and
 easily-avoidable way) on an earlier commit
 {{{
 05d233e8e18284cb98dc320bf58191ba4d86c754 Move InId/OutId to CoreSyn
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12944#comment:16>
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