It would be better to report these as bugs at bugs.ecmascript.org
On Feb 19, 2015, at 10:13 PM, Shinji Ikari wrote:
> The second section under 12.1.1 says:
> IdentifierReference[Yield] : yield
>
> BindingIdentifier[Yield] : yield
>
> LabelIdentifier[Yield] : yield
>
> It is a Syntax Error if this production has a [Yield] parameter.
>
> However, they are guarded by the [~Yield] condition. Is this section
> informative or outdated?
yes, this appears to be unnecessary
>
>
> The third section says:
> IdentifierReference[Yield] : Identifier
>
> BindingIdentifier[Yield] : Identifier
>
> LabelIdentifier[Yield] : Identifier
>
> It is a Syntax Error if this production has a [Yield] parameter and
> StringValue of Identifier is "yield".
>
> Is it possible to have the StringValue of an Identifier to be "yield"? Same
> applies to the second item of the the fourth section.
yes, in not strict code.
>
> The note below says "(Unicode)... escapes cannot be used to write an
> Identifier whose code point sequence is the same as a ReservedWord.". These
> two combined seem to imply that it is possible to have a StringValue of an
> Identifier to be as same as a ReservedWord, but you cannot do it though some
> certain way, which is bothering. (like saying: "I know you cannot do it
> though this way, but I'm not going to tell you how to do it or whether you
> can do it at all"). If it is not possible, we should remove the third section
> and the second item of the fourth section. If it is possible, we should note
> how it is possible.
only yield. yield acts as is an identifier in non-strict mode (except in
generator functions) and as a keyword in strict mode. In neither case, can
unicode escaping be used to sneak a yield equivalent code point sequence pass
these rules.
Allen
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