[GHC] #10505: more specific types in the generated *_stub.h files

[GHC]

#10505: more specific types in the generated *_stub.h files
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        Reporter:  imz               |                   Owner:
            Type:  feature request   |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler (FFI)    |                 Version:  7.6.1
      Resolution:                    |                Keywords:
Operating System:  Linux             |            Architecture:
 Type of failure:  Other             |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:  #2979, #8222      |                Blocking:
                                     |  Differential Revisions:
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Comment (by imz):

 The same problem and wish as mine are illustrated in
 http://stackoverflow.com/q/23629000/94687 by an attempt to use a Haskell
 function on Strings .

 The solutions so far:

 Either manual editing of the `.h` file (which may result in
 inconsistencies with the real code, and which is additional burden), or
 casting in the C code (which opens the door wide for inconsistencies with
 the real Haskell code).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10505#comment:1>
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