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

Brendan Eich brendan at
Wed Jan 21 10:21:14 PST 2015

Felix Kling wrote:
> [Section 
> 14.2.17]( 
> 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:

> 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 


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