[Webkit-unassigned] [Bug 157872] New: Our parser doesn't properly parse default parameter expressions in a class method

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=157872

            Bug ID: 157872
           Summary: Our parser doesn't properly parse default parameter
                    expressions in a class method
    Classification: Unclassified
           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: sbarati at apple.com
                CC: benjamin at webkit.org, fpizlo at apple.com,
                    ggaren at apple.com, gskachkov at gmail.com,
                    keith_miller at apple.com, mark.lam at apple.com,
                    msaboff at apple.com, oliver at apple.com,
                    sukolsak at gmail.com, utatane.tea at gmail.com

This is a syntax error:
it shouldn't be:

test(function() {
    class C {
        constructor() { this._x = 45; }
        get foo() { return this._x;}
    }
    class D extends C {
        x(x = ()=>super.foo) {
            return x();
        }
    }
    assert((new D).x() === 45);
});

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