parseArrowFunction example

return $this->completeNode($node);
        }
    }
    
    /** * Parses an assignment expression * * @return Node\Node|null */
    protected function parseAssignmentExpression()
    {
        if ($expr = $this->parseArrowFunction()) {
            return $expr;
        } elseif ($this->context->allowYield && $expr = $this->parseYieldExpression()) {
            return $expr;
        } elseif ($expr = $this->parseConditionalExpression()) {
            
            $exprTypes = array(
                "ConditionalExpression", "LogicalExpression",
                "BinaryExpression", "UpdateExpression", "UnaryExpression"
            );
            
            if (!in_array($expr->getType(), $exprTypes)) {