ABNF: comments

[mnot]

ABNF allows comments using ; as a delimiter to signal a comment to the end of the line.

This seems to be supported inline in a rule; e.g., this works:

foorule = bar  ; this is a comment
        / baz

but if the comment is on the last line of a rule, it will fail; e.g., either of these forms:

foorule = bar ; this is a comment

foorule = bar ; this is a comment
        / baz ; more commenting

[katef]

This is because $sep isn't being produced for the double newline, because the comment zone swallows its newline character. I think it'd be best to try to reimplement the whitespace handling, and hopefully get rid of the need for a double newline.