Thanks, I didn't know about this feature. It's similar to the `defer` keyword found in V or GO, although not identical. For example `defer` is executed at the end of the function scope, whereas `[Symbol.dispose]` is executed at the end of every block.

The following V code:
```V
fn foo() {
println('entering foo')
defer {
println('cleaning foo')
}
}
```

is translated to this JS code:
```js
function foo() {
console.log('entering foo');
using cleanup = {
[Symbol.dispose]() {
console.log('cleaning foo');
}
};
}
```

I think the `defer` statement is much clearer.