>(<span class="type-var">'a</span>, <span>unit <span class="arrow">&#45;&gt;</span></span> <span class="type-var">_</span>)</span> <a href="#type-fmt">fmt</a></span> <span class="arrow">&#45;&gt;</span></span> <span class="type-var">'a</span></span></code></div><div class="spec-doc"><p>Take a function from a string message to an exception, and a format string with the additional arguments it specifies, and then call the function on the formatted string and raise the returned exception.</p></div></div><div c