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> The upshot for me is that this feature adds RAII to JavaScript

That doesn’t appear to be the case, a resource can be returned, but this is block scoped. It appears to be closer to a using statement in C#.

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Based on my reading of the spec, you can't actually return a resource, since the disposal semantics need to map exactly to calling [Symbol.dispose] in a finally block at the end of the current block. Also, unlike C#, you can have multiple using statements in the same block, which will be disposed of in LIFO order.

You can create a resource without “using” it immediately, though.

You can have multiple using statements over the same block in C#.

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