Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

This will force legal third-party code to add special code to suppress 
warnings. This is breaking change.

Other problem is with shadowing builtins. This increases chance of breakage 
when introduce new builtins. Currently adding a new builtin does not affect 
existing code which does not use this builting, but all will be changed if 
implement this feature.

Since shadowing a builtin and overwriting an existing global is not always an 
error, I think this warning should not be the part of the interpreter, but 
rather a part of third-party linters (which can be configured to ignore some 
warnings for particular projects).

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue36762>
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