[issue31907] Clarify error message when attempting to call function via str.format()

[Eric V. Smith]

Eric V. Smith <eric at trueblade.com> added the comment:

Guido's suggestion in https://mail.python.org/pipermail/python-dev/2017-October/150055.html is to not change anything.

Assuming we do that, it's still an open issue as to if/how we should document and test the current behavior. I'd be surprised if it's tested, but I haven't looked.

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