"paragraph">Error checking:</h4>
<p>
For every output that is of a named type with the <span class=syntax-token>errorcheck(</span><span class=nonterminal>fn</span><span class=syntax-token>)</span>
attribute, the error checking function <span class=nonterminal>fn</span> is called after the C
function returns. That function is assumed to raise a Caml exception
if it finds an output denoting an error.</p>
<h4 id="sec29" class="paragraph">Custom calling and deallocation sequences:</h4>
<p>
The IDL declaration f