[GHC] #12927: Colorized error messages result in hard-to-read .dump-* files

[GHC]

#12927: Colorized error messages result in hard-to-read .dump-* files
-------------------------------------+-------------------------------------
           Reporter:  RyanGlScott    |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Other
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:  #8809
Differential Rev(s):                 |         Wiki Page:
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 To see this, compile this file:

 {{{#!hs
 module Main where

 x :: String -> String
 x s = print (reverse s + 1)
 }}}

 with `ghc-stage2 -ddump-tc-trace -ddump-to-file`. If you look at the
 resulting `.dump-tc-trace` file with a text editor like `vim`, you'll see
 at the bottom:

 {{{
 ...
 Tc7a
 checkMain fail Main main
 Adding error:
   ^[[;1mBug.hs:1:1: ^[[;1m^[[31merror:^[[;1m
       The IO action ‘main’ is not defined in module ‘Main’^[[0m
 }}}

 The error message is now much harder to discern that before the
 introduction of colorized error messages.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12927>
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