[GHC] #15361: Error message displays redundant equality constraint

[GHC]

#15361: Error message displays redundant equality constraint
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        Reporter:  RyanGlScott       |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler (Type    |              Version:  8.4.3
  checker)                           |
      Resolution:                    |             Keywords:  TypeInType
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Poor/confusing    |  Unknown/Multiple
  error message                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #14394            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by goldfire):

 I find the second example more convincing than the first. I wonder how we
 do that...

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15361#comment:3>
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