Clarification regarding "top level" arrow functions and "this"/"arguments"

[Brendan Eich]

Felix Kling wrote:
> [Section 
> 14.2.17](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-arrow-function-definitions-runtime-semantics-evaluation) 
> says
>
>> Any reference to `arguments`, `super`, or `this` within an 
>> *ArrowFunction* are resolved to their bindings in the lexically 
>> enclosing function.
>
> However, what if there is no enclosing function? Shouldn't this say 
> "enclosing environment"?

Good catch, probably best to file a bug at this point:

http://bugs.ecmascript.org/

> If yes, what would be the expected behavior of an arrow function that 
> references `this` and `arguments`?
> I assume in case of `this`, it would just resolve to the *thisBinding* 
> of the environment (if there is one). Since there is no `arguments` 
> binding (by default) I assume accessing `arguments` would throw a 
> reference error.
>
> Is my understanding correct? 

I think so, but SpiderMonkey has a bug, so it's hard to test that 
implementation.

https://bugzilla.mozilla.org/show_bug.cgi?id=889158

/be