[issue5247] Unhelpful error message with str.format()

[Eric Smith]

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

I'm getting ready to commit this. Does it need a test? I poked around
and didn't see any tests that validate exception text, but maybe there
are some I missed. I tend to think it shouldn't have a test, but I'm not
sure what the norm is.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5247>
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