[Paul]
> To what? The individual packages?
No, I meant distutils2 bugs.  I will open them when I get a minute.  You’re right that projects using metadata 1.0 or 1.1 don’t have to use a version conforming to PEP 386, and that packaging should warn when using the create and install actions and the check command, not when iterating over installed distributions.

[Tetsuya Morimoto]
> I made a patch which checks the "func_name" attribute of function before it refers. It
> works for me. However, I wonder if a function has both "func.im_self" and
> "func.func_name"? Tell me the background because I'm newbie for distutils2.
It’s not really a distutils2 detail but a general Python thing: functions and methods have these func_name (or __name__ in Python 3) attributes, and the somewhat complicated code in distutils2.pypi uses them to do its thing.  Alexis intends to clean up that code a bit and we’ll also need more tests.  If you’re new to distutils2, I think this bug is not easy or fun enough and you would have more luck working on another one.