public function finalize()
{
$code = '';
foreach ($this->overwrittenVars as $var => $lines) {
$s = var_export($var, TRUE);
$code .= 'if (isset($this->params[' . var_export($var, TRUE) . "])) trigger_error('Variable \$" . addcslashes($var, "'") . ' overwritten in foreach on line ' . implode(', ', $lines) . "'); ";
}
return [$code];
}