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(: Test: K-SeqIndexOfFunc-20                             :)
(: Written by: Frans Englich                             :)
(: Date: 2006-10-05T18:29:40+02:00                       :)
(: Purpose: A test whose essence is: `deep-equal(index-of((10, 20, 30, 30, 20, 10), 20), (2, 5))`. :)
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deep-equal(index-of((10, 20, 30, 30, 20, 10), 20), (2, 5))