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after `use` execution both first and second will be closed, so the object becomes unusable. I'm sorry for so many uses of the word 'use', but here I kinda have to :smile:

Why can't you just do the nesting inside the `use` function, instead of implementing manually. The whole implementation would be this: `first.use { a -&gt; second.use { b -&gt; useBlock(a, b) } }`.

I'm just solving theoretical a problem as it is formulated by Olekss. If I needed to use two closeables I would've used nesting as you suggest. This is just esoteric practice :slightly_smiling_face:

Yes, I know that :wink: I'm just suggesting that the implementation of the `use` function in `UsablePair` could just be what I wrote in my last comment. You don't really need that big try-catch statement.

IMO, _two_ nested statements is not "big"

No, I was referring to the try-catch as "big".

Oh, I see now, you definitely make a good point. I deliberately didn't want to use `use`. Wanted to see how implementation from scratch would look like.