[Webkit-unassigned] [Bug 142382] New: __proto__ shorthand property should not modify prototype in Object Literal construction

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=142382

            Bug ID: 142382
           Summary: __proto__ shorthand property should not modify
                    prototype in Object Literal construction
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: joepeck at webkit.org
                CC: ggaren at apple.com, rniwa at webkit.org

* SUMMARY
__proto__ shorthand property should not modify prototype in Object Literal construction.

<https://kangax.github.io/compat-table/es6/> has a section that __proto__ should not be supported as a shorthand, citing:
"Annex b § __proto__ in object literals".

{__proto__} should not be equivalent to {__proto__:...}.

Seems to be because:

  PropertyDefinition : IdentifierReference
  ...
  7. Return CreateDataPropertyOrThrow(object, propName, propValue).

And that does not fall under the Annex's special case handling of __proto__ in literals for grammar rule:

  PropertyDefinition : PropertyName : AssignmentExpression

So we shouldn't get the special handling.

--

Seems the expected behavior of __proto__ as a shorthand would be the equivalent of a Object.defineProperty(obj, "__proto__", { value: ... }) which sets the property but doesn't change the prototype.

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