// This function modifies the graph of tasks by adding or removing
// successors to comm0
comm0->on_this_start_cb([comm0, exec1, exec2, jupiter, fafard](sg4::Task*) {
// This function modifies the graph of tasks by adding or removing
// successors to comm0
comm0->on_this_start_cb([comm0, exec1, exec2, jupiter, fafard](sg4::Task*) {