[GHC] #5254: usb library fails on Windows

[GHC]

#5254: usb library fails on Windows
---------------------------------+------------------------------------------
    Reporter:  basvandijk        |       Owner:  simonmar     
        Type:  bug               |      Status:  new          
    Priority:  high              |   Milestone:  7.6.1        
   Component:  Compiler (FFI)    |     Version:  7.0.3        
    Keywords:                    |          Os:  Windows      
Architecture:  Unknown/Multiple  |     Failure:  Runtime crash
  Difficulty:  Unknown           |    Testcase:               
   Blockedby:                    |    Blocking:               
     Related:                    |  
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Changes (by simonmar):

  * owner:  => simonmar
  * difficulty:  => Unknown
  * priority:  low => high


Comment:

 The `FunPtr` that you pass to `mkForeignPtr` must use the `ccall` calling
 convention.  This should be documented - I'll fix that.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5254#comment:5>
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