[GHC] #8832: Constant-folding regression wrt `clearBit (bit 0) 0 `

[GHC]

#8832: Constant-folding regression wrt `clearBit (bit 0) 0 `
-------------------------------------+-------------------------------------
        Reporter:  hvr               |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  high              |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  7.8.1-rc2
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |               Test Case:
      Blocked By:                    |  simplCore/should_compile/T8832
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by Thomas Miedema <thomasmiedema@…>):

 In [changeset:"5e66a698dae8c01bcd1a9335346145b32016e119/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="5e66a698dae8c01bcd1a9335346145b32016e119"
 Testsuite: change some expect_fail tests to expect_broken

 Change the following tests from expect_fail to expect_broken: and list
 the ticket number:

     * driver/sigof03m/sigof03 (#9252)
     * driver/static001 (#8127)
     * partial-sigs/should_compile/EqualityConstraint (#9478)
     * partial-sigs/should_compile/ExtraNumAMROn (#9478)
     * partial-sigs/should_compile/PatBind2 (#9478)
     * partial-sigs/should_fail/TidyClash2 (#9478)
     * simplCore/should_compile/T8832 (#8832)

 The following tests are still marked as expect_fail, but it is not
 clearly documented why so:

     * gadt/lazypatok
     * indexed-types/should_fail/SkolemOccursLoop

 All other expect_fail tests are only expected to fail on either a
 certain platform/os or for a certain way only.

 Differential Revision: https://phabricator.haskell.org/D966
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8832#comment:22>
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