Feature request: multiple grammar parameter constraints on the RHS

[littledan]

In the RegExp named groups proposal, I'm updating the "Annex B" grammar for this new feature. I wanted to make the right hand side of a grammar production depend on two parameters, not one, but this seems to be not accounted for in Grammarkdown. Specifically, in the code, it looks like parseParameterValueAssertionTail expects a single token, and then a closing square bracket, but here, I'd have multiple comma-separated tokens. cc @bterlson

Anyway, this is not urgent; it can be worked around by separating into another nonterminal, as I did here.

[rbuckton]

Fixed in bc0d817.

[littledan]

Thanks!