[Webkit-unassigned] [Bug 166919] New: "this" missing after await in async arrow function

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=166919

            Bug ID: 166919
           Summary: "this" missing after await in async arrow function
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: hszhsh at icloud.com

My test code is as follows.

function runSomething(callback) {
    callback();
}

class Test {
    testFunc() {
        this.prop = "123";
        runSomething(async () => {
            console.log("callback " + this.prop); // It's ok here
            await sleep(2);
            console.log("callback end " + this.prop); // TypeError: undefined is not an object (evaluating 'this.prop')
        });
    }
}

let t = new Test();
t.testFunc();

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