[Haskell-cafe] Are constructors strict?
dmehrtash at gmail.com
Fri Jan 21 11:52:41 CET 2011
> loop = MonadPlus m => m Bool
loop = loop
> If we apply Just to loop as follows
> test2 :: MonadPlus m => m (Maybe Bool)
test2 = loop >>= return . Just
> the evaluation of test2 does not terminate because >>= has to evaluate
> loop. But this does not correctly reflect the behaviour in a functional
> logic language like Curry. For example, if you have a function that checks
> whether the outermost constructor of test2 is Just, the test is supposed to
> be successful. In the naive model for non-determinism this is not the case.
Do I have to have MonadPlus m or would any other Monad class work the same
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