next_failed_node
Prom_node *next_failed_node(Prom_node *);
pnode = next_failed_node(pnode);
pnode = next_failed_node(pnode);
pnode = next_failed_node(pnode);
pnode = next_failed_node(pnode);
pnode = next_failed_node(pnode);
pnode = next_failed_node(pnode);
pnode = next_failed_node(pnode);
pnode = next_failed_node(pnode);
pnode = next_failed_node(pnode);
pnode = next_failed_node(pnode);
pnode = next_failed_node(pnode);
pnode = next_failed_node(pnode);