bug #1801 Fix variable names for the deprecation triggering code (stof)

This PR was merged into the 1.x branch.

Discussion
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Fix variable names for the deprecation triggering code

Closes #1800

Commits
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dd446c0 Fix variable names for the deprecation triggering code

lib/Twig/ExpressionParser.php

@@ -580,7 +580,7 @@ protected function getFunctionNodeClass($name, $line)
 
         if ($function instanceof Twig_SimpleFunction && $function->isDeprecated()) {
             $message = sprintf('Twig Function "%s" is deprecated', $function->getName());
-            if ($test->getAlternative()) {
+            if ($function->getAlternative()) {
                 $message .= sprintf('. Use "%s" instead', $function->getAlternative());
             }
             $message .= sprintf(' in %s at line %d.', $this->parser->getFilename(), $line);
@@ -610,7 +610,7 @@ protected function getFilterNodeClass($name, $line)
 
         if ($filter instanceof Twig_SimpleFilter && $filter->isDeprecated()) {
             $message = sprintf('Twig Filter "%s" is deprecated', $filter->getName());
-            if ($test->getAlternative()) {
+            if ($filter->getAlternative()) {
                 $message .= sprintf('. Use "%s" instead', $filter->getAlternative());
             }
             $message .= sprintf(' in %s at line %d.', $this->parser->getFilename(), $line);