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

[GHC]

#10021: Add "Error:" prefix for 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 simonpj):

 You don't motivate the change.  Could you update the Description to
 explain why this would be a good change to make.

 Are there any disadvantages?  Presuambly ever `should_fail` test in GHC's
 regression suite, and every other library's regression suite, would need
 to be updated, which would be a nuisance.

 If there's a consensus in favour, I'm happy for this to happen.  It should
 also be easy to implement.

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10021#comment:1>
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