[Webkit-unassigned] [Bug 163574] New: Our ToThis semantics look to be affected by whether or not a local variable is captured

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=163574

            Bug ID: 163574
           Summary: Our ToThis semantics look to be affected by whether or
                    not a local variable is captured
    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: sbarati at apple.com
                CC: benjamin at webkit.org, fpizlo at apple.com,
                    ggaren at apple.com, gskachkov at gmail.com,
                    jfbastien at apple.com, keith_miller at apple.com,
                    mark.lam at apple.com, msaboff at apple.com,
                    oliver at apple.com, ticaiolima at gmail.com,
                    utatane.tea at gmail.com

This doesn't seem spec compliant to me:

```
function foo() { function bar() { return x; } var x = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__").get; return x(); }
foo() // [object Object]
```

```
function foo() { var x = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__").get; return x(); }
foo() // Exception: TypeError: Can't convert undefined or null to object
```

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