[GHC] #3955: occasional stray "mkUsageInfo" output

[GHC]

#3955: occasional stray "mkUsageInfo" output
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    Reporter:  dmwit             |       Owner:              
        Type:  bug               |      Status:  new         
    Priority:  normal            |   Component:  Compiler    
     Version:  6.12.1            |    Keywords:              
          Os:  Unknown/Multiple  |    Testcase:              
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown
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 Sometimes, there is a stray line in the compilation output that looks like

 {{{ mkUsageInfo: internal name? a{tv a43R} }}}

 The letters at the end vary. It doesn't lead to any problems, but is a bit
 unsightly.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3955>
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