Editorial: Add subscripts to BindingIdentifier static semantics.

[marjakh]

Adding subscripts here makes sense, because the semantics specifically talk
about the presence of a parameter.

Also, the productions below, where the semantics also talk about the presence
of a parameter, already have the subscripts. So it's inconsistent to not have
them here.

[bakkot]

Yeah, I like listing these when they actually affect the semantics.

[ljharb]

@marjakh would you mind registering as a contributor? https://github.com/tc39/ecma262/blob/master/CONTRIBUTING.md#required-legal-agreements

[marjakh]

I work at Google and I was under the impression we're covered somehow. Isn't that the case? This is my second contribution and I don't remember what i did the first time, whether I registered to something or not. It was a while back. I can try to search my e-mail for history, if needed.

[syg]

I work at Google and I was under the impression we're covered somehow. Isn't that the case? This is my second contribution and I don't remember what i did the first time, whether I registered to something or not. It was a while back. I can try to search my e-mail for history, if needed.

This is a good point, though unfortunately there's no easy way to check for employer. The best approximation we came up with is check for public membership in https://github.com/googlers. @marjakh Could you please join that at go/github, then go to https://github.com/googlers, search for your handle and set your membership to Public?

[marjakh]

Done!

[littledan]

Yes, people who work for member companies are generally covered, and should not sign the contributor form. Glad this has been sorted out.