[GHC] #14188: On windows, trace prints out lines without proper line endings

[GHC]

#14188: On windows, trace prints out lines without proper line endings
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           Reporter:  simonpj        |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.2.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Try this on Windows
 {{{
 module Foo where
   f x = x
 }}}
 and now
 {{{
 ghc -c -dverbose-core2core Foo.hs 2> foo
 }}}
 Now edit `foo`.  You'll see that
 * Some lines, produced by monadic IO, I think, have CRLF endings (`^M^J`).
 * But others, produced by `pprTrace` (actually `Simplify.hs` line 220,
 only have a LF ending (`^J`).

 The inconsistent line endings confuses emacs, which displays `^M` at the
 end of all the CRLF lines (ie most of them).  This is Jolly Annoying.
 John Wiegley has made me a special SPJ-only emacs mimor mode that
 suppresses the annoying `^M` stuff, but that seems like extreme measures.

 Question: why doesn't `pprTrace` properly terminate its lines?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14188>
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