t><dd><p>Captures one arg expression of the given primitive type</p></dd></dl><dl><dt class="spec value" id="val-capt_var_exn"><a href="#val-capt_var_exn" class="anchor"></a><code><span class="keyword">val</span> capt_var_exn : <span><span>(<span class="type-var">'context</span>, <a href="../../IR/Ident/index.html#type-t">IR.Ident.t</a>, <span class="type-var">'wrapped_arg</span>, <span class="type-var">'wrapped_arg</span> <span>&#45;&gt;</span> <span class="type-var">'f</span>, <span class="type-var">'