[Haskell-cafe] A question about "monad laws"

[Dan Piponi]

IOn Feb 11, 2008 9:46 AM, Miguel Mitrofanov <miguelimo38 at yandex.ru> wrote:
> It's well known that "ListT m" monad violates this law in general
> (though it satisfies it for some particular monads m). For example,

I went through this example in quite a bit of detail a while ago and
wrote it up here:
http://sigfpe.blogspot.com/2006/11/why-isnt-listt-monad.html . I tried
to show not just why the monad laws fails to hold for ListT [], but
also show how it almost holds.
--
Dan