Bug 187758 – Inconsistent output compared with other JS engines

• Status: RESOLVED
• Resolution: DUPLICATE
• Component: JavaScriptCore

Hello,
The following code behaves strangely (inconsistent with other engines).

class c {                                                                                                                                        
    [d = function () {
        return c;
    }]() {
    }   
}

print("BT_FLAG");
In JavaScriptCore, the output is
BT_FLAG
However, in V8 and SpiderMonkey, output is
ReferenceError: d is not defined

BT group
2018.7.18

[Yusuke Suzuki]

Because class heritage should be handled as strict code.

*** This bug has been marked as a duplicate of bug 187045 ***