Give useful error message when accessing request outside of request scope

src/Silex/Application.php

@@ -111,6 +111,10 @@ class Application extends \Pimple implements HttpKernelInterface, EventSubscribe
             return new RedirectableUrlMatcher($app['routes'], $app['request_context']);
         });
 
+        $this['request'] = function () {
+            throw new \RuntimeException('Accessed request service outside of request scope. Try moving that call to a before handler or controller.');
+        };
+
         $this['request.http_port'] = 80;
         $this['request.https_port'] = 443;
         $this['debug'] = false;

tests/Silex/Tests/ApplicationTest.php

@@ -58,7 +58,7 @@ class ApplicationTest extends \PHPUnit_Framework_TestCase
         $this->assertEquals($request, $app['request']);
     }
 
-    public function testgetRoutesWithNoRoutes()
+    public function testGetRoutesWithNoRoutes()
     {
         $app = new Application();
 
@@ -165,6 +165,16 @@ class ApplicationTest extends \PHPUnit_Framework_TestCase
 
         $this->assertEquals('text/html; charset=ISO-8859-1', $response->headers->get('Content-Type'));
     }
+
+    /**
+     * @expectedException RuntimeException
+     */
+    public function testAccessingRequestOutsideOfScopeShouldThrowRuntimeException()
+    {
+        $app = new Application();
+
+        $request = $app['request'];
+    }
 }
 
 class FooController