[Webkit-unassigned] [Bug 271240] New: Parameter of async function is undefined if it reassigned later

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=271240

            Bug ID: 271240
           Summary: Parameter of async function is undefined if it
                    reassigned later
           Product: WebKit
           Version: Safari 17
          Hardware: Mac (Apple Silicon)
                OS: macOS 14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: csongor.szilagyi at appfire.com

Created attachment 470434

  --> https://bugs.webkit.org/attachment.cgi?id=470434&action=review

A short html snippet to reproduce the issue

Consider the following async function:


  async function test_1(a) {
    console.log(a)
    var a = a === 0 ? 1 : 2;
    console.log(a)
  }

  test_1(1);

## Expected output: 1 2
## Actual output: undefined 2

Additional note: if the parameter is not reassigned in the function, the console.log prints the correct value. 

Expected output can be tested in Chrome, Firefox, Edge

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