[GHC] #7854: Constrained method type accepted in Haskell 98 mode

[GHC]

#7854: Constrained method type accepted in Haskell 98 mode
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        Reporter:  refold            |                   Owner:  thomie
            Type:  bug               |                  Status:  closed
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Compiler (Type    |                 Version:  7.6.3
  checker)                           |                Keywords:  newcomer
      Resolution:  fixed             |            Architecture:
Operating System:  Unknown/Multiple  |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:                    |  module/mod39
 Related Tickets:  #10118, #10119    |                Blocking:
                                     |  Differential Revisions:  Phab:D688
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Comment (by ekmett):

 It has been around for a long time, but I know at least a few of us were
 rather startled when we started getting error messages about it and every
 occurrence I've found so far is a module where I have FlexibleContexts
 already enabled.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7854#comment:19>
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