/* anbn0.y */
/* accepts L = {anbn | n >= 0} */

%token A B
%start s

%%
empty:
     ;

s    : anbn '\n' {
                   printf("is in anbn\n");
                   return 0;
                 }

anbn : empty
     | A anbn B
     ;

%%
#include "lex.yy.c"   /* from anbn.l */

main() {
  return yyparse();
}
int yyerror( char *s ) { fprintf( stderr, "%s\n", s); }