input grammar: yacc.txt
0 $accept → program $end 1 program → ε
$end (0) error (256)
$accept (3) on left: 0 program (4) on left: 1 on right: 0
0 $accept → . program $end 1 program → . $default reduce using rule 1 (program) program go to state 1
0 $accept → program . $end $end shift, and go to state 2
0 $accept → program $end . $default accept