improved error messages

lib/Twig/ExpressionParser.php

@@ -344,7 +344,7 @@ class Twig_ExpressionParser
         while (true) {
             $token = $this->parser->getStream()->expect(Twig_Token::NAME_TYPE, null, 'Only variables can be assigned to');
             if (in_array($token->getValue(), array('true', 'false', 'none'))) {
-                throw new Twig_Error_Syntax($token->getValue() . ' cannot be assigned to');
+                throw new Twig_Error_Syntax(sprintf('You cannot assign a value to "%s"', $token->getValue()));
             }
             $targets[] = new Twig_Node_Expression_AssignName($token->getValue(), $token->getLine());
 

lib/Twig/Template.php

@@ -128,7 +128,12 @@ abstract class Twig_Template implements Twig_TemplateInterface
                     return null;
                 }
 
-                throw new Twig_Error_Runtime(sprintf('Key "%s" for array "%s" does not exist', $item, $object), -1, $this->getTemplateName());
+                if (is_object($object)) {
+                    throw new Twig_Error_Runtime(sprintf('Key "%s" in object (with ArrayAccess) of type "%s" does not exist', $item, get_class($object)), -1, $this->getTemplateName());
+                // array
+                } else {
+                    throw new Twig_Error_Runtime(sprintf('Key "%s" for array with keys "%s" does not exist', $item, implode(', ', array_keys($object))), -1, $this->getTemplateName());
+                }
             }
         }
 

test/Twig/Tests/TemplateTest.php

@@ -10,6 +10,28 @@
  */
 class Twig_Tests_TemplateTest extends PHPUnit_Framework_TestCase
 {
+    public function getUnkownPropertyOnArrayTests()
+    {
+        $tests = array(
+            array(array('foo' => 'foo', 'bar' => 'value')),
+            array(new Twig_TemplateObjectArrayAccess()),
+        );
+
+        return $tests;
+    }
+
+    /**
+     * @dataProvider getUnkownPropertyOnArrayTests
+     * @expectedException Twig_Error_Runtime
+     */
+    public function testUnkownPropertyOnArray($array)
+    {
+        $env = new Twig_Environment(null, array('strict_variables' => true));
+        $template = new Twig_TemplateTest($env);
+
+        $template->getAttribute($array, 'unknown', array(), Twig_Node_Expression_GetAttr::TYPE_ARRAY);
+    }
+
     /**
      * @dataProvider getGetAttributeTests
      */