[GHC] #12689: DataCon wrappers get in the way of rules

[GHC]

#12689: DataCon wrappers get in the way of rules
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        Reporter:  nomeata           |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Joachim Breitner <mail@…>):

 In [changeset:"f8d2c205e04bcb83d39ccbede4c2a6279f702a6b/ghc"
 f8d2c205/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="f8d2c205e04bcb83d39ccbede4c2a6279f702a6b"
 Add a broken test case for #12689

 A rule with a phase specification trying to match on a constructor with
 a wrapper will fail to match, as the wrapper will be inlined by then.
 The fact that it works in the other case is also mostly by accident.
 (Split into two test cases so that regressions with regard what works so
 far are caught.)
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12689#comment:3>
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