[GHC] #10176: Invalid core generated with GHC 7.10 RC3

[GHC]

#10176: Invalid core generated with GHC 7.10 RC3
-------------------------------------+-------------------------------------
        Reporter:  NeilMitchell      |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  high              |               Milestone:  7.10.1
       Component:  Compiler          |                 Version:  7.10.1-rc3
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by hvr):

 not sure if this is useful information, but I compared the output of

 {{{
 ghc -fforce-recomp -outputdir obj -O -ddump-simpl -dsuppress-uniques
 Buggy.hs
 }}}

 for acbfc19a6d27b51aaec5177e4b64ea9b45f74c84 (recent ghc-7.10 branch
 snapshot) vs. 029a296a770addbd096bbfd6de0936327ee620d4 (one commit before
 the big typeable-change that caused `shake-test oracle test` to start
 failing)

 And well, the Core output looks just the same, so I'm not sure if the
 `Buggy.hs`/`Errors.hs` test-case highlights the same issue causing `shake-
 test` to fail.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10176#comment:12>
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