</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="type-var">'c</span>)</span> <a href="index.html#type-t">t</a></span> <span>&#45;&gt;</span> <span><span>(<span class="type-var">'b</span>, <span class="type-var">'d</span>)</span> 