ebnf-ignore-empty-rule

ebnf-ignore-empty-rule is a variable defined in `ebnf2ps.el'.
Its value is

nil

Documentation:
Non-nil means ignore empty rules.

It's interesting to set this variable if your Yacc/Bison grammar has a lot of
middle action rule.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 20 of Emacs.