You need to do something like this to force them to run, apparently
main = do foo $ Prelude.concat $ replicate 100 data_
Just triggering the GC with performGC doesn't do it.
The really odd thing is that if I setup a C finalizer (see below)
then it's triggered once and the whole thing crashes with a bus
error. Duncan reported that it segfaulted for him as well.
installFinalizer fps@(P.PS fp _ _) =
addForeignPtrFinalizer finalizer fp
foreign import ccall unsafe "finalizer" finalizer :: FinalizerPtr Word8
where the finalizer itself is
#include
This is definitely odd. I can't see a reason why the finalizers wouldn't be running.