[GHC] #12020: Error message on use of != should suggest use of /=

[GHC]

#12020: Error message on use of != should suggest use of /=
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           Reporter:  mhoermann      |             Owner:
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  7.10.3
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Currently when one uses != instead of /= it comes up with this error
 message

 {{{

         Not in scope: ‘!=’
         Perhaps you meant one of these:
           ‘Map.!’ (imported from Data.Map), ‘>=’ (imported from Prelude),
           ‘==’ (imported from Prelude)

 }}}


 Considering != is very common for unequal in other languages there should
 be a more helpful hint to use /= instead of or in addition to the current
 generic symbol error.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12020>
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