[GHC] #7563: Passing -C flag causes the 'impossible' to happen

[GHC]

#7563: Passing -C flag causes the 'impossible' to happen
---------------------------------+------------------------------------------
    Reporter:  jstolarek         |       Owner:  igloo                            
        Type:  bug               |      Status:  new                              
    Priority:  normal            |   Milestone:  7.8.1                            
   Component:  Driver            |     Version:  7.7                              
    Keywords:                    |          Os:  Unknown/Multiple                 
Architecture:  Unknown/Multiple  |     Failure:  Incorrect warning at compile-time
  Difficulty:  Unknown           |    Testcase:                                   
   Blockedby:                    |    Blocking:                                   
     Related:                    |  
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Comment(by ian@…):

 commit 68833e5e8caa1c23f75ab8bea4377ede28ff9548
 {{{
 Author: Ian Lynagh <ian at well-typed.com>
 Date:   Fri Jan 11 18:42:40 2013 +0000

     Make "happensBefore" take account of whether we are unregisterised

     If we are not unregisterised then we skip the HCc phase.
     Fixes #7563.

  compiler/main/DriverPhases.hs   |   61
 +++++++++++++++++++++-----------------
  compiler/main/DriverPipeline.hs |   11 ++++---
  2 files changed, 40 insertions(+), 32 deletions(-)
 }}}

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7563#comment:2>
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