[GHC] #9723: Give Tab warning only once per file

[GHC]

#9723: Give Tab warning only once per file
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        Reporter:  nomeata           |                   Owner:  dalaing
            Type:  feature request   |                  Status:  closed
        Priority:  low               |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  7.9
      Resolution:  fixed             |                Keywords:  newcomer
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |  parser/should_compile/T9723{a,b}
                                     |                Blocking:
                                     |  Differential Revisions:  Phab:D760
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Comment (by Thomas Miedema <thomasmiedema@…>):

 In [changeset:"ced27def2d33119ed9fcc22f92856f132fd72217/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="ced27def2d33119ed9fcc22f92856f132fd72217"
 Remove dead code / overlapping pattern (#9723)
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9723#comment:10>
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