private function parseVariable()
    {
        $start = $this->lexer->token;
        $this->expect(Token::DOLLAR);

        return new VariableNode([
            'name' => $this->parseName(),
            'loc'  => $this->loc($start),
        ]);
    }
private function parseVariable()
    {
        $start = $this->lexer->token;
        $this->expect(Token::DOLLAR);

        return new VariableNode([
            'name' => $this->parseName(),
            'loc'  => $this->loc($start),
        ]);
    }
@return VariableNode

@throws SyntaxError