[GHC] #10554: Replacing existing attachment with the same name doesn't work

[GHC]

#10554: Replacing existing attachment with the same name doesn't work
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              Reporter:  thomie      |             Owner:  hvr
                  Type:  bug         |            Status:  new
              Priority:  normal      |         Milestone:
             Component:  Trac & Git  |           Version:  7.10.1
              Keywords:              |  Operating System:  Unknown/Multiple
          Architecture:              |   Type of failure:  None/Unknown
  Unknown/Multiple                   |        Blocked By:
             Test Case:              |   Related Tickets:
              Blocking:              |
Differential Revisions:              |
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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10554>
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