entifier>C</span><span class=special>&amp; </span><span class=identifier>c </span><span class=special>)
    </span><span class=special>: </span><span class=identifier>begin</span><span class=special>( </span><span class=identifier>c</span><span class=special>.</span><span class=identifier>begin</span><span class=special>() </span><span class=special>), </span><span class=identifier>end</span><span class=special>( </span><span class=identifier>c</span><span class=special>.</span><span class=identifier>end</s