def child():
print 'Child started.'
yield bluelet.null()
print 'Child resumed.'
yield bluelet.null()
print 'Child ending.'
yield bluelet.end(42)
def parent():
print 'Parent started.'
yield bluelet.null()
print 'Parent resumed.'
result = yield child()
print 'Child returned:', repr(result)
print 'Parent ending.'
def exc_child():
yield bluelet.null()
raise Exception()
