** Variable names.
What should we name `variant' and `lex_symbol'?
-** Update the documentation on gnu.org
-
** Get rid of fake #lines [Bison: ...]
Possibly as simple as checking whether the column number is nonnegative.
Enhance bench.pl with %b to run different bisons.
* Various
-** Warnings
-Warnings about type tags that are used in printer and dtors, but not
-for symbols?
-
** YYERRCODE
Defined to 256, but not used, not documented. Probably the token
number for the error token, which POSIX wants to be 256, but which