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<p>The second line here does <em>not</em> simply overwrite the first; rather, <em>both</em> statements contribute to the density function that is evaluated. The above two lines have the effect of including the product, <span class="math inline">\(\textsf{normal}(y \mid 0,1) * \textsf{normal}(y \mid 2,3)\)</span>, into the density function.</p>
<p>For a perhaps more confusing example, consider the following two lines in a Stan model:<