 class="keyword">type</span> <span>('a, 'b) t</span></code></dt></dl><dl><dt class="spec value" id="val-bimap"><a href="#val-bimap" class="anchor"></a><code><span class="keyword">val</span> bimap : <span>(<span class="type-var">'a</span> <span>&#45;&gt;</span> <span class="type-var">'b</span>)</span> <span>&#45;&gt;</span> <span>(<span class="type-var">'c</span> <span>&#45;&gt;</span> <span class="type-var">'d</span>)</span> <span>&#45;&gt;</span> <span><span>(<span class="type-var">'a</span>, <span class=