[GHC] #10021: Add "Error:" prefix for compile-time error messages

[GHC]

#10021: Add "Error:" prefix for compile-time error messages
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        Reporter:  k-bx              |                   Owner:  k-bx
            Type:  feature request   |                  Status:  new
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  7.8.4
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by thomie):

 If you're going to run that on the full testsuite, make sure you install
 these [Building/RunningTests/Running#AdditionalPackages packages] with the
 inplace compiler. Otherwise some tests get skipped.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10021#comment:17>
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