[antlr-interest] Removing output=AST lets ANTLR fail to generate

[Christian]

Hi community,

it seems that ANTLR cannot generate the lexer and parser if output=AST
is removed, but the operators and rewrite rules are still left in the
grammar. Am I right? If yes, that's really regrettable...and unflexible.
You could just ignore rewrite rules and operators, if output != AST,
couldn't you?

Regards,
Christian