number of ops: 10
0 FETCH_W $0, 'a', 1
1 RECV $0, '1', 0
2 FETCH_R $2, 'a', 1
3 SEND_VAL 0, '0', 1
4 SEND_VAL 0, '3', 2
5 DO_FCALL $3, 'rand', 0
6 ADD %4, $2, $3
7 FETCH_W $1, 'a', 1
8 ASSIGN $5, $1, %4
9 RETURN 0, '', 0