Bug 187758

Summary: Inconsistent output compared with other JS engines
Product: WebKit Reporter: sunlili
Component: JavaScriptCoreAssignee: Nobody <webkit-unassigned>
Status: RESOLVED DUPLICATE    
Severity: Normal CC: fpizlo, ysuzuki
Priority: P2    
Version: WebKit Local Build   
Hardware: Unspecified   
OS: Unspecified   

Description sunlili 2018-07-18 07:32:36 PDT 
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
Comment 1 Yusuke Suzuki 2018-07-22 13:04:26 PDT 
Because class heritage should be handled as strict code.

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