[Webkit-unassigned] [Bug 149338] [ES6] "super" and "this" should be lexically bound inside an arrow function and should live in a JSLexicalEnvironment

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=149338

--- Comment #81 from Saam Barati <sbarati at apple.com> ---
(In reply to comment #80)
> (In reply to comment #79)
> > (In reply to comment #78)
> > > What happens when we call super once we've exited the constructor function?
> > > Is there anything in the spec on this? Does is mutate "this"?
> > > 
> > > Like:
> > > ```
> > > class C extends B {
> > >     constructor() {
> > >         this.weird = () => super();
> > >         super();
> > >     }
> > >     foo() { 
> > >         this.weird();
> > >     }
> > > }
> > > 
> > > (new C).foo();
> > > ```
> > 
> > I've not checked this case, but I'm sure that we can't run super() twice in
> > constructor, second call should lead to RuntimeException. See tred on
> > es6-discuss https://esdiscuss.org/topic/duplicate-super-call-behaviour. 
> > But this behavior is not related to the arrow function.
> Interesting. We currently don't throw on a second call to super().
> That's bad, we should file a bug.
I created this bug for this problem:
https://bugs.webkit.org/show_bug.cgi?id=151113

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