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PhabricatorDataNotAttachedException.php
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			<?php

			final class PhabricatorDataNotAttachedException extends Exception {

			public function __construct($object) {
			$stack = debug_backtrace();

			// Shift off `PhabricatorDataNotAttachedException::__construct()`.
			array_shift($stack);
			// Shift off `PhabricatorLiskDAO::assertAttached()`.
			array_shift($stack);

			$frame = head($stack);
			$via = null;
			if (is_array($frame)) {
			$method = idx($frame, 'function');
			if (preg_match('/^get[A-Z]/', $method)) {
			$via = ' '.pht('(via %s)', "{$method}()");
			}
			}

			parent::__construct(
			pht(
			"Attempting to access attached data on %s, but the data is not ".
			"actually attached. Before accessing attachable data on an object, ".
			"you must load and attach it.\n\n".
			"Data is normally attached by calling the corresponding %s method on ".
			"the Query class when the object is loaded. You can also call the ".
			"corresponding %s method explicitly.",
			get_class($object).$via,
			'needX()',
			'attachX()'));
			}

			}