AllPermissionsList.__iter__ returns tuple(). Should return iter(tuple())?

[dfee]

My understanding is that iter should return an iterator object.

However, AllPermissionsList.__iter__ returns ().

Indeed, this raises a TypeError as expected:

In [1]: from pyramid.security import ALL_PERMISSIONS

In [2]: iter(ALL_PERMISSIONS)
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-22-f8a3d5a1d337> in <module>()
----> 1 iter(ALL_PERMISSIONS)

TypeError: iter() returned non-iterator of type 'tuple'

Lastly, I don't see where this method is used in Pyramid. Should this code (the __iter__ method on AllPermissionsList) even exist?