Using benchmark from the section https://www.python.org/dev/peps/pep-0492/#async-await raises:
Traceback (most recent call last):
  File "./bench.py", line 28, in <module>
    timeit(abinary, 19, 30)
  File "./bench.py", line 23, in timeit
    list(gen(depth))
TypeError: 'coroutine' object is not iterable

Am I missing something or is a correction needed in code or documentation?

BTW, PEP 492 uses the term "plain generator", but unlike "generator-based coroutine" or "native coroutine" it's not defined in section https://www.python.org/dev/peps/pep-0492/#glossary. I think adding a definition would be beneficial.