[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:
            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 k-bx):

 @hvr while Emacs compilation highliter (the one that lets you navigate
 through errors after `M-x compile`) is smart enough to understand current
 GHC output, I would say that lower-casing might be useful for other
 similar tools that work on top of compiler's output and are hard-coded for
 GCC/clang lower-cased "error" and "warning", so +1 from me on this.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10021#comment:7>
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