[HttpKernel] Better exception page when the invokable controller returns nothing

src/Symfony/Component/HttpKernel/Exception/ControllerDoesNotReturnResponseException.php

@@ -67,9 +67,15 @@ class ControllerDoesNotReturnResponseException extends \LogicException
         if (\is_object($controller)) {
             $r = new \ReflectionClass($controller);
 
+            try {
+                $line = $r->getMethod('__invoke')->getEndLine();
+            } catch (\ReflectionException $e) {
+                $line = $r->getEndLine();
+            }
+
             return [
                 'file' => $r->getFileName(),
-                'line' => $r->getEndLine(),
+                'line' => $line,
             ];
         }
 

src/Symfony/Component/HttpKernel/Tests/HttpKernelTest.php

@@ -215,20 +215,19 @@ class HttpKernelTest extends TestCase
     public function testHandleWhenTheControllerDoesNotReturnAResponse()
     {
         $dispatcher = new EventDispatcher();
-        $kernel = $this->getHttpKernel($dispatcher, function () { return 'foo'; });
+        $kernel = $this->getHttpKernel($dispatcher, function () {});
 
         try {
             $kernel->handle(new Request());
 
             $this->fail('The kernel should throw an exception.');
         } catch (ControllerDoesNotReturnResponseException $e) {
+            $first = $e->getTrace()[0];
+
+            // `file` index the array starting at 0, and __FILE__ starts at 1
+            $line = file($first['file'])[$first['line'] - 2];
+            $this->assertContains('// call controller', $line);
         }
-
-        $first = $e->getTrace()[0];
-
-        // `file` index the array starting at 0, and __FILE__ starts at 1
-        $line = file($first['file'])[$first['line'] - 2];
-        $this->assertContains('// call controller', $line);
     }
 
     public function testHandleWhenTheControllerDoesNotReturnAResponseButAViewIsRegistered()