I've checked out GHC 5.03 from CVS a few days ago
and compiled it on my MacOS X machine. The compiler panics
with stack overflow on the following file:
\begin{code}
module CrashingMonad where
data PPResult a = PPSuccess a PPState
newtype PP a = PP (PPState -> PPResult a)
data PPState = PPState (PP ())
instance Monad PP where
a >>= b = a `ppThen` b
return x = ppReturn x
ppReturn x = undefined -- PP (\state -> PPSuccess x state)
(PP a) `ppThen` b =
PP (\state -> case (a state) of
PPSuccess x state' ->
undefined -- case (b x) of PP b' -> b' state'
)
test = ppReturn 1 `ppThen`
undefined -- ppReturn
\end{code}
I don't think it's a problem with my MacOS X port,
after all it compiled the library and some other modules of my
program without problems.
Increasing the maximum stack size only delays the panic.
If I simplify the above module any further, the panic goes away.
(Replacing the "undefined"s by the commented out expressions changes
nothing).
There is no problem with ghc-5.02.2 on Intel. I cannot try it out
on ghc-5.03/intel due to lack of disk space.
Any Ideas?
Wolfgang Thaller
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