Fixed #DDC-578

Also added a new testcase

lib/Doctrine/ORM/Proxy/ProxyFactory.php

@@ -164,7 +164,11 @@ class ProxyFactory
             }
 
             if ($method->isPublic() && ! $method->isFinal() && ! $method->isStatic()) {
-                $methods .= PHP_EOL . '    public function ' . $method->getName() . '(';
+                $methods .= PHP_EOL . '    public function ';
+                if ($method->returnsReference()) {
+                    $methods .= '&';
+                }
+                $methods .= $method->getName() . '(';
                 $firstParam = true;
                 $parameterString = $argumentString = '';
 

tests/Doctrine/Tests/Models/Forum/ForumEntry.php

@@ -18,5 +18,9 @@ class ForumEntry
      * @Column(type="string", length=50)
      */
     public $topic;
+
+    public function &getTopicByReference() {
+        return $this->topic;
+    }
 }
 

tests/Doctrine/Tests/ORM/Proxy/ProxyClassGeneratorTest.php

@@ -95,6 +95,16 @@ class ProxyClassGeneratorTest extends \Doctrine\Tests\OrmTestCase
         $this->assertEquals('Doctrine\Tests\Models\ECommerce\ECommerceProduct', $params[0]->getClass()->getName());
     }
 
+    /**
+     * Test that the proxy behaves in regard to methods like &foo() correctly
+     */
+    public function testProxyRespectsMethodsWhichReturnValuesByReference() {
+        $proxy = $this->_proxyFactory->getProxy('Doctrine\Tests\Models\Forum\ForumEntry', null);
+        $method = new \ReflectionMethod(get_class($proxy), 'getTopicByReference');
+
+        $this->assertTrue($method->returnsReference());
+    }
+
     public function testCreatesAssociationProxyAsSubclassOfTheOriginalOne()
     {
         $proxyClass = 'Proxies\DoctrineTestsModelsECommerceECommerceFeatureProxy';