[Haskell-cafe] Problem with own written monad

Miguel Mitrofanov miguelimo38 at yandex.ru
Mon Jan 7 10:15:46 EST 2008

> 	data Stack a = Stack { run :: [a] -> (a, [a]) }


> But, I have simply no clue how to fix that. :-(
> Can anybody give my a hint?

Yes. It's simply impossible. The Stack data type can't be turned into  
a monad.

May be you can explain what do you want to do with this "monad"? What  
kind of code would you write if it would be such monad?

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