[Webkit-unassigned] [Bug 247784] New: Async arrow function being `undefined`

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=247784

            Bug ID: 247784
           Summary: Async arrow function being `undefined`
           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

Hello,

`x` is `undefined` after executing `let x = async x => { for await ( { x } of [ 0 ] ) ; } ; x ( ) ;` in WebKit JSC,
but I think that it is expected to be `async x => ....`:

---
$ jsc
>>> let x = async x => { for await ( { x } of [ 0 ] ) ; } ; x ( ) ;
[object Promise]
>>> x
undefined
>>>
---

while other engines behave like:

---
# V8
V8 version 10.9.0
d8> let x = async x => { for await ( { x } of [ 0 ] ) ; } ; x ( ) ;
[object Promise]
d8> x
async x => { for await ( { x } of [ 0 ] ) ; }
d8>
---


WebKit version: 615.1.10

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