;&#39;
   | &#39;target&#39; &#39;+=&#39; expression &#39;;&#39;
   | &#39;break&#39; &#39;;&#39;
   | &#39;continue&#39; &#39;;&#39;
   | &#39;print&#39; &#39;(&#39; (expression | string_literal) % &#39;,&#39; &#39;)&#39; &#39;;&#39;
   | &#39;reject&#39; &#39;(&#39; (expression | string_literal) % &#39;,&#39; &#39;)&#39; &#39;;&#39;
   | &#39;return&#39; expression &#39;;&#39;
   | &#39;;&#39;

assignment_op ::= &#39;&lt;-&#39; | &#39;=&#39; | &#39;+=&#39; | &#39;-=&#39; | &#39;*=&#39; | &#39;/=&#39; | &#