ause an error when it tries to create a
non-rectangular array.</p>
<pre class="stan"><code>{ { 1, 2, 3 }, { 4, 5 } }  // compile time error: size mismatch</code></pre>
<p>This may appear to be OK, because it is creating a two-dimensional
integer array (<code>int[ , ]</code>) out of two one-dimensional array
integer arrays (<code>int[ ]</code>). But it is not allowed because the two
one-dimensional arrays are not the same size. If the elements are
array expressions, this can be diagnosed at compile time. If 