pr">Libabsolute.Csp.expr</a> * <a href="../../../Libabsolute/Csp/index.html#type-cmpop">Libabsolute.Csp.cmpop</a> * <a href="../../../Libabsolute/Csp/index.html#type-expr">Libabsolute.Csp.expr</a>)</span> <span>&#45;&gt;</span> Apronext.Tconsext.t</code></dt><dt class="spec value" id="val-apron_to_var"><a href="#val-apron_to_var" class="anchor"></a><code><span class="keyword">val</span> apron_to_var : <span><span class="type-var">'a</span> Apron.Abstract1.t</span> <span>&#45;&gt;</span> <span>string list</s