New issue 2277: zip doesn't call __iter__ on list objects
https://bitbucket.org/pypy/pypy/issues/2277/zip-doesnt-call-__iter__-on-list-objects
Iain Buclaw:
```
#!python
class A(object):
def __init__(self, values):
self.values = values
def __iter__(self):
print "DEBUG: (A) __iter__ called"
return list.__iter__(self.values)
class B(list):
def __init__(self, values):
list.__init__(self, values)
def __iter__(self):
print "DEBUG: (B) __iter__ called"
return list.__iter__(self)
mylist = [1,2,3,4]
a = A(mylist)
b = B(mylist)
c = zip(a, mylist)
d = zip(b, mylist)
```
When running this test program, I get two results:
```
# python bin/test.py
DEBUG: (A) __iter__ called
DEBUG: (B) __iter__ called
# pypy bin/test.py
DEBUG: (A) __iter__ called
```
Using pypy 2.7.10 and python 2.7.6.
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