Why is accursedUnutterablePerformIO
(aka inlinePerformIO
) implemented
accursedUnutterablePerformIO :: IO a -> a
accursedUnutterablePerformIO (IO a) = case a realWorld# of (# _, r #) -> r
and not
accursedUnutterablePerformIO :: IO a -> a
accursedUnutterablePerformIO (IO a) = case a realWorld# of (# s, r #) -> s `seq` r
?
Simply put,
realWorld#
doesn't exist runtime, therefore we can't do any computation on it, thusseq
doesn't do anything either.