[Webkit-unassigned] [Bug 247427] New: Setting prototype of global `this` throws `TypeError`

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=247427

            Bug ID: 247427
           Summary: Setting prototype of global `this` throws `TypeError`
           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: p51lee at kaist.ac.kr

// input.js
Object . setPrototypeOf ( this , { } ) ;
__________________________________________

Hello,

Executing the input.js using JSC throws TypeError, but it is expected to terminate normally.

Running the input.js with JSC gives

---
$ jsc input.js
Exception: TypeError: Cannot set prototype of immutable prototype object
setPrototypeOf@[native code]
global code at input.js:1:24
---

while other engines behave like

---
# V8
$ node input.js
// no error

# GraalJS
$ js input.js
// no error
---


WebKit version: 615.1.10

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