lass="keyword">val</span> id : <span class="type-var">'a</span> <span>&#45;&gt;</span> <span class="type-var">'a</span></code></dt></dl><dl><dt class="spec value" id="val-const"><a href="#val-const" class="anchor"></a><code><span class="keyword">val</span> const : <span class="type-var">'a</span> <span>&#45;&gt;</span> <span class="type-var">'b</span> <span>&#45;&gt;</span> <span class="type-var">'a</span></code></dt><dt class="spec value" id="val-flip"><a href="#val-flip" class="anchor"></a><code><span cla