[GHC] #11126: Entered absent arg in a Repa program

[GHC]

#11126: Entered absent arg in a Repa program
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        Reporter:  tuplanolla        |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect result  |  Unknown/Multiple
  at runtime                         |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by thomie):

 I can not reproduce this bug with HEAD.

 To reproduce with ghc-7.10.2, `cabal install repa`, and compile the above
 example with `-O -funfolding-use-threshold=90` (`-funfolding-use-
 threshold=80` makes the bug go away).

 Maybe it is fixed. But I can't be certain: change the example ever so
 slightly, and the bug is not reproducible with ghc-7.10.2 either.

 Adding this as a test is difficult, because it depends on `repa`, and we
 don't want to add that to the testsuite.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11126#comment:1>
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