able-type-declaration">Base variable type declaration</h3>
<p>The base variable types are <code>integer</code>, <code>real</code>, <code>complex</code>, <code>vector</code>, <code>row_vector</code>, and <code>matrix</code>. No lower-bound or upper-bound constraints are allowed (e.g., <code>real&lt;lower=0&gt;</code> is illegal). Specialized constrained types are also not allowed (e.g., <code>simplex</code> is illegal).</p>
<p>Tuple types of the form <code>tuple(T1, ..., TN)</code> are also allowed, with all