eyword">val</span> (&lt;.) : <span><span>(<span class="type-var">'a</span>, <span class="type-var">'b</span>)</span> <a href="argument-1-S/index.html#type-t">S.t</a></span> <span>&#45;&gt;</span> <span><span>(<span class="type-var">'c</span>, <span class="type-var">'a</span>)</span> <a href="argument-1-S/index.html#type-t">S.t</a></span> <span>&#45;&gt;</span> <span><span>(<span class="type-var">'c</span>, <span class="type-var">'b</span>)</span> <a href="argument-1-S/index.html#type-t">S.t</a></span></c