Hi, I have an ecmascript question. I do not know how to ask him on the site. Therefore, I want to ask you personally.

The specification says: "In certain contexts, ObjectLiteral is used as a cover grammar for a more restricted secondary grammar. The CoverInitializedName production is necessary to fully cover these secondary grammars. "

I don't understand what "cover grammar" means.

Still, there is such a sentence: "This production exists so that ObjectLiteral can serve as a cover grammar for ObjectAssignmentPattern." Honestly, I do not understand its meaning. Could you explain it to me if you understand?

2ality.com/2012/04/arrow-functions.html

and stackoverflow.com/questions/43969489/…

do discuss this a bit

Basically it means they use the same rules (ObjectLiteral) for different things to allow for easier parsing which only afterwards decides on the meaning. This leads to a few productions being allowed by the grammar, and the afterhand being disallowed by static semantic rules depending on the context.

At least that's as far as i understand it, I guess for details you will have to ask at esdicuss.