pe-var">'a</span> <span>&#45;&gt;</span> <span class="type-var">'b</span>)</span></span> <span>&#45;&gt;</span> <span>write:<span>(<span class="type-var">'b</span> <span>&#45;&gt;</span> <span class="type-var">'a</span>)</span></span> <span>&#45;&gt;</span> <span><span class="type-var">'a</span> <a href="index.html#type-typ">typ</a></span> <span>&#45;&gt;</span> <span><span class="type-var">'b</span> <a href="index.html#type-typ">typ</a></span></code></dt><dt class="spec value" id="val-typedef"><a href="#va