[issue4510] ValueError for list.remove() not very helpful

[Tim Lesher]

Tim Lesher <tlesher at gmail.com> added the comment:

This patch combines the fix from Georg Brandl's original patch with the fix made to listindex.  The r76058 fix fails the test in Georg's original test where the repr of the item to be removed itself raises; this patch handles that case for both list.remove and list.index.

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Added file: http://bugs.python.org/file18110/improve_list_remove_error.diff

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