[GHC] #7557: Default implementation for a type class function missing when profiling is enabled

[GHC]

#7557: Default implementation for a type class function missing when profiling is
enabled
---------------------------------+------------------------------------------
    Reporter:  JohnWiegley       |       Owner:                  
        Type:  bug               |      Status:  infoneeded      
    Priority:  normal            |   Milestone:                  
   Component:  Compiler          |     Version:  7.6.1           
    Keywords:                    |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown    
  Difficulty:  Unknown           |    Testcase:                  
   Blockedby:                    |    Blocking:                  
     Related:                    |  
---------------------------------+------------------------------------------

Comment(by JohnWiegley):

 The code has now moved on enough that it's going to be very hard to
 reproduce this.  The best I can suggest is to clone the project and look
 back for a commit around the same date as this bug report.  Or, just close
 this bug and see if someone else runs into it.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7557#comment:3>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler