Bug 187045

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

Description sunlili 2018-06-26 08:16:04 PDT
Hello,
The following code behaves strangely (inconsistent with other engines).

class cc extends ( x = function () {
    console.log("Hi");
}) {
};

In webkit, cc is defined normally and x is defined too.

However, in V8 and Firefox, a ReferenceError is reported:
ReferenceError: assignment to undeclared variable x

BT group
2018.6.26
Comment 1 Yusuke Suzuki 2018-07-22 13:04:26 PDT
*** Bug 187758 has been marked as a duplicate of this bug. ***