[GHC] #11967: Custom message when showing functions, comparing functions, ...

[GHC]

#11967: Custom message when showing functions, comparing functions, ...
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        Reporter:  Iceland_jack      |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Core Libraries    |              Version:  7.10.3
      Resolution:                    |             Keywords:
                                     |  CustomTypeErrors
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Iceland_jack):

 This can be considered a more general question: would any of the core
 libraries benefit from custom type errors?

 I doubt it is only useful for EDSLs.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11967#comment:2>
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