[Webkit-unassigned] [Bug 247432] New: TypeError is expected when reassigning to `const` during destructuring in for statement

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=247432

            Bug ID: 247432
           Summary: TypeError is expected when reassigning to `const`
                    during destructuring in for statement
           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
const x = 0 ; for ( { x } in { x } ) ;
__________________________________________

Hello,

Executing the input.js using JSC, it is terminated normally.
However, it is expected to throw TypeError since there is an assignment to constant variable.

Running the input.js with JSC results in:

---
$ jsc input.js
// no error
---

while other engines behave like:

---
# V8
$ node input.js
input.js:1: TypeError: Assignment to constant variable.
const x = 0 ; for ( { x } in { x } ) ;
                      ^
TypeError: Assignment to constant variable.
    at input.js:1:23

# GraalJS
$ js input.js
TypeError: Assignment to constant "x"
        at <js> :program(input.js:1:22)
---


WebKit version: 615.1.10

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