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--TEST--
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SplDoublyLinkedList::top empty
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--CREDITS--
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Gabriel Caruso (carusogabriel34@gmail.com)
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--FILE--
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<?php
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try {
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(new SplDoublyLinkedList)->top();
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} catch (RuntimeException $e) {
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echo $e->getMessage();
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}
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?>
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--EXPECT--
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Can't peek at an empty datastructure
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