Invalid words while using NOT

[38b394ce01]

Hey,

I'm writing a converter from ANTLR to another format. To test this converter I used Grammarinator and a parser generator to fuzz my conversion and verify if it can parse every word.

I have encountered the following problem:
When using the NOT feature of ANTLR, Grammarinator generates invalid words.

Consider the following ANTLR grammar not.g4

grammar not;

start: '>' No_comma '<';
No_comma: ~',';

Now all possible words should come out like >a< or >6<, but the word >,< is not valid because we don't allow a comma with the NOT feature.
I tested different variants for the No_comma rule to match the ANTLR documentation both as lexer and parser rules, in every run Grammarinator still outputs invalid words.

Finding this error took me a lot of time, because I first looked for the error in my converter. Even if it is not fixed, it would be very nice to confirm it so that I can be sure.

Used versions:
Grammarinator19.3
antlr-4.9.3-complete.jar
Python 3.7

Thanks a lot,
38b394ce01

[38b394ce01]

Sorry, just tested the version of the master branch. There it works.