[GHC] #13291: bpk15 and bkp47 fail with -dunique-increment=-1

[GHC]

#13291: bpk15 and bkp47 fail with -dunique-increment=-1
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        Reporter:  niteria           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #4012             |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by ezyang):

 It looks like the old class-matching code for hs-boot files assumes that
 methods inside a Class are always sorted (a comment suggests that they
 are), but it doesn't seem to be the case. It kind of looks like I'll just
 have to rewrite that segment of code.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13291#comment:2>
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