[GHC] #10288: -flate-dmd-anal triggers "Entered absent arg"

[GHC]

#10288: -flate-dmd-anal triggers "Entered absent arg"
-------------------------------------+-------------------------------------
        Reporter:  yongqli           |                   Owner:  simonpj
            Type:  bug               |                  Status:  merge
        Priority:  highest           |               Milestone:  7.10.2
       Component:  Compiler          |                 Version:  7.10.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Runtime crash     |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
-------------------------------------+-------------------------------------
Changes (by simonpj):

 * priority:  normal => highest
 * status:  new => merge


Comment:

 yongqli, your test case nailed it -- thank you!  It was so helpful to be
 able to reproduce it, and it's not an easy case to make happen, so I might
 well have failed to find it, or assumed it was already fixed, without your
 help.

 Austin: please merge the above two to 7.10.

 I'm not adding a regression test because it's hard to provoke; and the fix
 (which consisted only of deleting code) is pretty robust.

 Simon

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10288#comment:11>
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