```
~master λ python3.8             
Python 3.8.2 (default, Apr 21 2020, 00:39:48) 
[Clang 11.0.0 (clang-1100.0.33.17)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import ast
>>> ast.parse('''f"{x=}"''')  # should work
<_ast.Module object at 0x10f81af40>
>>> ast.parse('''f"{x=}"''', feature_version=(3, 6))  # should fail, but doesn't
<_ast.Module object at 0x10f857d00>
```