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

[GHC]

#10021: Add "Error:" prefix for compile-time error messages
-------------------------------------+-------------------------------------
        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:
-------------------------------------+-------------------------------------

Comment (by spl):

 Having not looked at the code, I'm not even sure how output, dump, and
 interactive (to say the least) are cases of severity.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10021#comment:12>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler