[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:  patch
        Priority:  low               |               Milestone:
       Component:  Compiler          |                 Version:  7.9
      Resolution:                    |                Keywords:  newcomer
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:  Phab:D760
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Comment (by Thomas Miedema <thomasmiedema@…>):

 In [changeset:"afcfb62b748c41d31b8c8e3ef7f623fa00a1cfd2/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="afcfb62b748c41d31b8c8e3ef7f623fa00a1cfd2"
 Change 'Tab character' warnings so there is one per file (#9723)

 Reviewed By: nomeata, thomie

 Differential Revision: https://phabricator.haskell.org/D760

 Signed-off-by: Dave Laing <dave.laing.80 at gmail.com>
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9723#comment:8>
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