[issue6089] str.format raises SystemError

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

trunk and py3k debug build gives this:

>>> '{0[0](10)}'.format([None])
python: Objects/stringlib/string_format.h:379: FieldNameIterator_next:
Assertion `0' failed.
zsh: abort      ./python

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nosy: +r.david.murray

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