From 2a7abb8ea08b3cf26c21954ab4354ede666d283f Mon Sep 17 00:00:00 2001
From: Fabien Potencier <fabien.potencier@gmail.com>
Date: Wed, 3 Feb 2010 15:40:26 +0100
Subject: [PATCH] [DependencyInjection] tweaked an error message to ease
 debugging

---
 src/Symfony/Components/DependencyInjection/Builder.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Symfony/Components/DependencyInjection/Builder.php b/src/Symfony/Components/DependencyInjection/Builder.php
index 5b197bc012..53f4b17383 100644
--- a/src/Symfony/Components/DependencyInjection/Builder.php
+++ b/src/Symfony/Components/DependencyInjection/Builder.php
@@ -440,11 +440,11 @@ class Builder extends Container
       }
       else
       {
-        $replaceParameter = function ($match) use ($parameters)
+        $replaceParameter = function ($match) use ($parameters, $value)
         {
           if (!array_key_exists($name = strtolower($match[2]), $parameters))
           {
-            throw new \RuntimeException(sprintf('The parameter "%s" must be defined.', $name));
+            throw new \RuntimeException(sprintf('The parameter "%s" must be defined (used in the following expression: "%s").', $name, $value));
           }
 
           return $parameters[$name];