[issue7788] segfault when deleting from a list using slice with very big `step' value

[Marcin Bachry]

Marcin Bachry <hegel666 at gmail.com> added the comment:

I attach the patch. I changed signedness in all three sequence types and made sure tests crash when run on unpatched Python.

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Added file: http://bugs.python.org/file16019/fix.diff

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