alu21.in1: set ilc=*;
alu21.in1: recv, deliver, send token to fifo0.out;
+fifo0.out: head;
fifo0.out: [Rq] send to alu21.in1;
fifo0.out: [Rq] recv token;
alu21.out: send token to alu21.out;
alu21.out: set olc=1;
+alu21.out: head;
alu21.out: [Rq] collect;
//alu21.out: [Rq] set flags a=a, b=b; // uncommenting this line will mask the bug
alu21.out: [Rq] send to debug0.in;