id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	os	architecture	failure	difficulty	testcase	blockedby	blocking	related
353	(OS X) Can't link MonadCont, but ghci works	laboratoryman	nobody	"{{{
The following test case prints [0,1,2] with ghci-6.4 on
OS X, but ghc can't link it.  The error is

$ ghc-6.4 -o y yield-cont-fails.hs

ld: Undefined symbols:
_ControlziMonadziCont_zdfMonadCont_closure
___stginit_ControlziMonadziCont_


The test case:

import Control.Monad.Cont

yield :: a -> Cont [a] ()
yield x = Cont (\c -> x : c ())

asGenerator :: Cont [a] v -> [a]
asGenerator (Cont f) = f (const [])

test = asGenerator (yield 0 >> yield 1 >> yield 2)

main = do print test

I have also attached it as a file to this bug.  I do
not have other versions of ghc installed.  I installed
GHC from

http://www.haskell.org/ghc/dist/6.4/MacOSX/GHC-6.4.pkg.zip

}}}"	bug	closed	normal		Compiler	6.4	Invalid