[GHC] #9173: Better type error messages

[GHC]

#9173: Better type error messages
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        Reporter:  simonpj           |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.8.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  warning at compile-time            |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by sgillespie):

 I'd like to have a look. What is the proposed message? Should we use the
 original message below?

 {{{
 Foo.hs:2:20
   inferred: "Just 5" has type "Maybe a0"
   expected: second argument of "($)" must have type "Int"
   in the expression: addThree $ Just 5
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9173#comment:20>
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