discussion of how to suppress C preprocessor warnings about YYFAIL
being unused, see the Bison 2.4.2 NEWS entry.
-** `%prec IDENTIFIER' requires IDENTIFIER to be defined separately.
-
- As promised in Bison 2.4.2's NEWS entry, it is now an error if a token
- that appears after a %prec directive is not defined by %token, %left,
- %right, or %nonassoc. This is required by POSIX.
-
** Temporary hack for adding a semicolon to the user action.
Previously, Bison appended a semicolon to every user action for