fixed scoping for local on for tag.

__for.cpp

@@ -27,9 +27,11 @@ namespace jet {
 	    if(!variableDefined("scope") || (variables["scope"] == "global"))
 	      global.variables[variables["name"]] = ix;
 	    else if(variables["scope"] == "local")
-	      local->variables[variables["name"]] = ix;
+	      this->local->variables[variables["name"]] = ix;
 	    else if(variables["scope"] == "parent")
 	      parent->local->variables[variables["name"]] = ix;
+	    else
+	      throw coreutils::Exception("scope value is not valid.");
 	 }	 
 	 processContainer(container);
 	 container.reset();