[Webkit-unassigned] [Bug 189470] New: Fail to throw TypeError when setting function.length in Array.prototype.unshift

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=189470

            Bug ID: 189470
           Summary: Fail to throw TypeError when setting function.length
                    in Array.prototype.unshift
           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, executing following code:
-----------------------------------
var f = function func1() {};
var a=[];
print(f.length);
a.unshift.call(f,1,2,3)
print(f.length);
-----------------------------------
Output of jsc is:
0
0

However, since function's length property is readonly, a TypeError should be thrown in unshift() execution.

BT group
2018.09.10

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