;&nbsp;<span class="keyword">val</span>&nbsp;sempty&nbsp;:&nbsp;<span class="keywordsign">'</span>a&nbsp;<span class="constructor">Stream</span>.t<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;slazy&nbsp;:&nbsp;(unit&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="keywordsign">'</span>a&nbsp;<span class="constructor">Stream</span>.t)&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="keywordsign">'</span>a&nbsp;<span class="constructor">Stream</span>.t<br>
&nbsp;&nbsp;<span 