If this error it's not a token, if it's an error handler then you could
redefine the yyerror function:
yyerror(message)
char *message;
{
fprintf(stderr, "%s near '%s'\n", message, yytext);
exit(1);
};
And everytime a syntactic error occurs it will display: kind_of_error 'near'
text before the error ocurred.
YACC and Bison includes so many usefull functions.
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