[GHC] #5753: ghci doesn't always use compiled modules

[GHC]

#5753: ghci doesn't always use compiled modules
---------------------------------+------------------------------------------
    Reporter:  rl                |       Owner:            
        Type:  bug               |      Status:  infoneeded
    Priority:  normal            |   Milestone:  7.4.1     
   Component:  Compiler          |     Version:  7.2.1     
    Keywords:                    |          Os:  Windows   
Architecture:  Unknown/Multiple  |     Failure:  Other     
  Difficulty:  Unknown           |    Testcase:            
   Blockedby:                    |    Blocking:            
     Related:                    |  
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Comment(by rl):

 `-ddump-hi-diffs` says this in the last step:

 {{{
     Source file changed or recompilation check turned off
 }}}

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5753#comment:4>
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