testing

DifferentialFieldDataNotAvailableException.php
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			<?php

			final class DifferentialFieldDataNotAvailableException extends Exception {

			public function __construct(DifferentialFieldSpecification $spec) {
			$key = $spec->getStorageKey();
			$class = get_class($spec);

			parent::__construct(
			"Differential field specification for '{$key}' (of class '{$class}') is ".
			"attempting to access data which is not available in this context.");
			}

			}