I've written a patch here that includes a few useful fixes. Namely:

- It doesn't crash if it encounters a syntax error. (17396)
- It doesn't report certain name collisions as bad. (35376)
- It doesn't use mutable default arguments in its initializer.
- Most importantly, it now uses `importlib` instead of `imp`, which is deprecated. (25160) As a benefit, frozen built-in modules (`zip import`, for example), are now correctly reported.

With the exception of these bug fixes, I've been very careful to preserve the original behavior, and have not changed any part of the API. This patch also includes 2 new regression tests.