[Webkit-unassigned] [Bug 187045] New: Inconsistent output compared with other JS engines

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=187045

            Bug ID: 187045
           Summary: Inconsistent output compared with other JS engines
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sunlili at ict.ac.cn

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

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