[GHC] #14125: Bogus unacceptable type in foreign declaration.

[GHC]

#14125: Bogus unacceptable type in foreign declaration.
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        Reporter:  winter            |                Owner:  (none)
            Type:  bug               |               Status:  patch
        Priority:  high              |            Milestone:  8.2.2
       Component:  Compiler (FFI)    |              Version:  8.2.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3865
       Wiki Page:                    |
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Comment (by RyanGlScott):

 Gotcha, thanks for confirming. To be on the safe side, I've updated the
 Diff to include a test that uses `IOErrno UnixReturn` as a return type as
 well.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14125#comment:8>
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