--- /dev/null
+<?php
+
+/*
+ * This file is part of the Behat.
+ * (c) Konstantin Kudryashov <ever.zet@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Behat\Behat\Definition\Exception;
+
+use Behat\Behat\Definition\Definition;
+use RuntimeException;
+
+/**
+ * Represents an exception caused by a redundant step definition.
+ *
+ * If multiple step definitions in the boundaries of the same suite use same regular expression, behat is not able
+ * to determine which one is better and thus this exception is thrown and test suite is stopped.
+ *
+ * @author Konstantin Kudryashov <ever.zet@gmail.com>
+ */
+final class RedundantStepException extends RuntimeException implements SearchException
+{
+ /**
+ * Initializes redundant exception.
+ *
+ * @param Definition $step2 duplicate step definition
+ * @param Definition $step1 firstly matched step definition
+ */
+ public function __construct(Definition $step2, Definition $step1)
+ {
+ $message = sprintf(
+ "Step \"%s\" is already defined in %s\n\n%s\n%s",
+ $step2->getPattern(), $step1->getPath(), $step1->getPath(), $step2->getPath()
+ );
+
+ parent::__construct($message);
+ }
+}