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kotlinlang

I tried `var current: Body? = this@Body` but the compiler doesn't like that

You should use `this@iterator` instead (the name function that has the receiver you want to refer to)

oh, cool.  that works but it totally doesn't match my mental model of what's going on.  what should I read up on to understand better?

You're thinking in terms of types / class names, you should think in terms of "who provides the `this` you're trying to access".

You can read more about it here:
<https://kotlinlang.org/docs/this-expressions.html>

I think of it as `this`as it was at `function/label`

If you would like to access a receiver based on its *type*, a utility function like this works:
```fun &lt;A&gt; A.given(): A = this```
usage:
```operator fun Body.iterator(): Iterator&lt;Body&gt; {
    return object : Iterator&lt;Body&gt; {
        var current: Body? = given&lt;Body&gt;()
        ...
    }
}```
(This really comes in handy with Context Receivers because it allows differentiating between a `List&lt;Int&gt;` and a `List&lt;String&gt;` for instance)