Small typo in GRAMMAR.txt

[edhowland]

I noticed a small typo on line 17 of GRAMMAR.txt:

17: ::= "="

I believe this should be: . Missing the final 'e'

Note: I transpiled this file from this type of Extended BNF to what I am calling Regular Expression Flavored EBNF.

Differences:

[optional] => (optional)?
{repetition} => (repetition)*

Then I used the BNF Playground:
https://bnfplayground.pauliankline.com

It compiles there and that site found the typo.

Regards, Ed Howland