1169734 - Make super() work outside of arrow functions or eval

Status: RESOLVED FIXED

(Core :: JavaScript Engine, defect)

Description

[Eric Faust [:efaust]]

This requires the following steps:

1) Disable the use of eval or arrow functions inside derived class constructors.
2) Implement a TDZ-like |this| inside derived class constructors
3) Provide parser and emitter support for super().

Comment 1

[Kohei Yoshino]

Any ETA before arrow functions are available in constructors again?

Comment 2

[Eric Faust [:efaust]]

(In reply to Kohei Yoshino [:kohei] from comment #1)
> Any ETA before arrow functions are available in constructors again?

There is hope! Jan is working on bug 1132183, which should allow us to get super() working properly inside derived class constructors. Hopefully this will be done soon.

My understanding is that arrow functions and super() don't work in any of the major engines at the moment, though that may be stale.

Comment 3

[Kohei Yoshino]

Good to hear. Thanks!

Comment 4

[Eric Faust [:efaust]]

This is actually done, as written.

Comment 5

[Kohei Yoshino]

I guess one more step is missing. As per Bug 1132183, we can do this now, right?

4) Re-enable the use of eval or arrow functions inside derived class constructors.

Comment 6

[Emanuel Hoogeveen [:ehoogeveen]]

(In reply to Kohei Yoshino [:kohei] from comment #5)
> I guess one more step is missing. As per Bug 1132183, we can do this now,
> right?
> 
> 4) Re-enable the use of eval or arrow functions inside derived class
> constructors.

This is being tracked in bug 1230710.