[project @ 2002-02-05 15:42:04 by simonpj]
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Main.main
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A bunch of related fixes concerning 'main'
* Arrange that 'main' doesn't need to be defined in module Main;
it can be imported.
* The typechecker now injects a binding
Main.$main = PrelTopHandler.runMain main
So the runtime system now calls Main.$main, not PrelMain.main.
With z-encoding, this look like
Main_zdmain_closure
* The function
PrelTopHandler.runMain :: IO a -> IO ()
wraps the programmer's 'main' in an exception-cacthing wrapper.
* PrelMain.hs and Main.hi-boot are both removed from lib/std, along
with multiple lines of special case handling in lib/std/Makefile.
This is a worthwhile cleanup.
* Since we now pick up whatever 'main' is in scope, the ranamer gets
in on the act (RnRnv.checkMain). There is a little more info to
get from the renamer to the typechecker, so I've defined a new type
Rename.RnResult (c.f. TcModule.TcResult)
* With GHCi, it's now a warning, not an error, to omit the binding
of main (RnEnv.checkMain)
* It would be easy to add a flag "-main-is foo"; the place to use
that information is in RnEnv.checkMain.
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On the way I made a new type,
type HscTypes.FixityEnv = NameEnv Fixity
and used it in various places I'd tripped over
23 files changed: