907742 - In "new g()", bind generator object to "this".

Status: RESOLVED WONTFIX

(Core :: JavaScript Engine, defect)

Description

[Andy Wingo [:wingo]]

In ES6, this should be { value: 1 }, but it is currently { } because this is undefined, and thus this.x is undefined as well.

    function g18() {
        function* g() { yield this.x; yield this.y; }
        var iter = new g;
        iter.x = 1;
        iter.y = 2;
        return iter;
    }
    g18().next()

Comment 1

[Jason Orendorff [:jorendorff]]

I just spent 15 minutes confirming that this is in fact what happens, per the current spec text.

Comment 2

[Jason Orendorff [:jorendorff]]

Well, 15 minutes plus 5 years training myself on how to read ES-spec-ese.

Comment 3

[Andy Wingo [:wingo]]

See https://bugs.ecmascript.org/show_bug.cgi?id=1489 for more discussion on this issue.

Comment 4

[André Bargull [:anba]]

Generators are no longer constructors (bug 1191486) - resolving as Won't Fix.