[GHC] #13600: surprising error message with bang pattern

[GHC]

#13600: surprising error message with bang pattern
-------------------------------------+-------------------------------------
        Reporter:  andrewufrank      |                Owner:  v0d1ch
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.2
      Resolution:                    |             Keywords:  BangPatterns,
                                     |  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Poor/confusing    |            Test Case:  T13600a,
  error message                      |  T13600b
      Blocked By:                    |             Blocking:
 Related Tickets:  #15166, #15458    |  Differential Rev(s):  Phab:D5040
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by Ben Gamari <ben@…>):

 In [changeset:"0b0cb484eb0b51bf5485dfadff7cd8a079ceb16e/ghc"
 0b0cb484/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="0b0cb484eb0b51bf5485dfadff7cd8a079ceb16e"
 Surprising error message with bang pattern

 Reviewers: bgamari, alanz

 Reviewed By: bgamari

 Subscribers: sgraf, mpickering, rwbarton, thomie, carter

 GHC Trac Issues: #13600

 Differential Revision: https://phabricator.haskell.org/D5040
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13600#comment:18>
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