Matthias Bussonnier <bussonniermatth...@gmail.com> added the comment:

> A utility to check whether an AST requires async mode should be fairly 
> straightforward.

Here is one case we forgot in IPython apparently :

In [1]: x = 1
   ...: def f():
   ...:     nonlocal x
   ...:     x = 10000

This is not detected as a syntax error, but considered as asyn, we took an 
approach that prefer false positive (try to run invalid syntax as async) than 
false negative (reject valid async-code). Add this to the test suite for this 
feature.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34616>
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