[project @ 2002-06-27 15:38:58 by simonmar]
Finally fix foreign export and foreign import "wrapper" so that exceptions raised during the call are handled properly rather than causing the RTS to bomb out. In particular, calling System.exitWith in a foreign export will cause the program to terminate cleanly with the desired exit code. All other exceptions are printed on stderr (and the program is terminated). Details: GHC.TopHandler.runMain is now called runIO, and has type IO a -> IO a (previously it had type IO a -> IO (), but that's not general enough for a foreign export). The stubs for foreign export and forein import "wrapper" now automatically wrap the computation in runIO or its dual, runNonIO. It turned out to be simpler to do it this way than to do the wrapping in Haskell land (plain foreign exports don't have wrappers in Haskell).
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