[GHC] #3803: addCoverageTicksTobind should not panic when file location is Nothing

[GHC]

#3803: addCoverageTicksTobind should not panic when file location is Nothing
---------------------------------+------------------------------------------
    Reporter:  clemens           |        Owner:              
        Type:  bug               |       Status:  new         
    Priority:  normal            |    Milestone:  6.12.2      
   Component:  Compiler          |      Version:  6.12.1      
    Keywords:  hpc               |   Difficulty:              
          Os:  Unknown/Multiple  |     Testcase:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
---------------------------------+------------------------------------------
Changes (by igloo):

  * milestone:  => 6.12.2


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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3803#comment:1>
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