Variables: 
bool[1]: "b.x" 
chan[1]: "B" 

Event graph: 
event[0]: fork: null, #pred: 0, succ: 1 2 

# process[1]:
event[1]: send: s.S!(true), pid: 1, #pred: 1, succ: 1 
channel deps: 1 

# process[2]:
event[2]: receive: b.S?(b.x), pid: 2, #pred: 1, succ: 2 
channel deps: 1 

