[Webkit-unassigned] [Bug 220506] New: An issue about grammar checking

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=220506

            Bug ID: 220506
           Summary: An issue about grammar checking
           Product: WebKit
           Version: WebKit Local Build
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: nisl_grammarly1 at 163.com

#version: dbae081(https://github.com/WebKit/WebKit-http/commit/dbae081ad7e22d9ab61edf2f337f6c2bb593c7f8)

#Testcase:
for ([a,b] = [1,2] of [[3,4]]) {};
print(a);
print(b);

#Command:
./webkit/WebKitBuild/Release/bin/jsc testcase.js

#Output:
3
4

#Expected output:
SyntaxError: invalid for in/of left hand-side

#Description:
When executing this test case, other engines throw errors (such as v8, SpiderMonkey, chakra, etc.), but JSC executes normally and outputs 3 and 4. So I suspect this is a bug in javaScriptCore.

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