A Reviewer's bug

[Matthew Milano]

Hi everyone,

While reviewing our artifact for submission, one reviewer found a bug in our code.

His test case:


--- start
class MultiCont(object):
  def __init__(self, *args):
    self.allc = args

  def __iter__(self):
    for c in self.allc:
      for i in c:
        print(i)
        yield i

# # This works beautifully:
# for i in range(100,107):
#   print(i)

m = MultiCont(range(1,7),range(0,3))

# This won't work:
for i in m:
  print(i)
--- end


My reduced test case, which still fails (hopefully for similar reasons):

class MultiCont(object):
 def __init__(self, arg):
  self.allc = arg
 def __iter__(self):
  print(self.allc)
  yield(self.allc)

m = MultiCont('foo')
tmp_iter = iter(m)
tmp_iter.__next__()



I'm seeing this reveal a bug with either generators or iterators, but I'm not sure how to further refine the test to hone in on the nature of this bug.  Any ideas from the generator/iterator people? 

~matthew