Changes in version 2.3a, 2006-09-13:
+* Bison now supports generating Java parsers. Grammars written for
+ the Java language should include the `%language "Java"' directive.
+
* Instead of %union, you can define and use your own union type
YYSTYPE if your grammar contains at least one <type> tag.
Your YYSTYPE need not be a macro; it can be a typedef.