Bison tokens, as this runs afoul of the 2003-10-07 change that
disallowed NUL bytes in character constants or string literals.
%type <ival> '@<:@'
/* Exercise quotes in strings. */
%type <ival> '@<:@'
/* Exercise quotes in strings. */
-%token FAKE "fake @<:@@:>@ \a\b\f\n\r\t\v\"\'\?\\\u005B\U0000005c ??!??'??(??)??-??/??<??=??> \x0\0"
+%token FAKE "fake @<:@@:>@ \a\b\f\n\r\t\v\"\'\?\\\u005B\U0000005c ??!??'??(??)??-??/??<??=??> \x1\1"
%%
/* Exercise M4 quoting: '@:>@@:>@', @<:@, 1. */
%%
/* Exercise M4 quoting: '@:>@@:>@', @<:@, 1. */