Changed implementation of For in such a way that it only depends on the existence of a each method. This allows drops to simply implement each for enumeration

test/error_handling_test.rb

@@ -57,8 +57,23 @@ class ErrorHandlingTest < Test::Unit::TestCase
       
     end
     
+  end            
+  
+  def test_missing_endtag
+    
+    assert_nothing_raised do
+      
+      template = Liquid::Template.parse(' {% for a in b %} ... ')
+      assert_equal ' Liquid error: Unknown operator =! ', template.render
+      
+      assert_equal 1, template.errors.size
+      assert_equal Liquid::SyntaxError, template.errors.first.class
+      
+    end
+    
   end
   
+  
   def test_unrecognized_operator
     
     assert_nothing_raised do