[DanWaterworth]

> The thing is that, in Haskell, even when you attach a function to run during destruction, the runtime doesn't guarantee that the function will be called promptly, or even at all.

However, this is different than the bracket pattern that the article is taking about. No one in the Haskell community advocates cleaning up resources (like file descriptors, etc) using only destructors.

[kccqzy]

You misunderstood me. I'm explaining why simply adopting RAII is inappropriate in Haskell, even though the author thinks it's a better approach. I've edited my comment to make this clearer.

[thesz]

Author of the article discusses a library - two approaches of different (parts of) libraries.

It is quite possible you may need to have RAII somewhere in Haskell code and that's where things like parametrized monads are good: http://blog.sigfpe.com/2009/02/beyond-monads.html

It is a library and I keep saying that what is usually programming language feature is just a library in Haskell.