 must
start with an alphabetic character (<code>a--z</code> or <code>A--Z</code>) and
contain only alphanumeric characters (<code>a--z</code>, <code>A--Z</code>, and
<code>0--9</code>) and underscores (<code>_</code>) and should not conflict with
any C++ reserved keyword.</p>
<p>The C++ code implementing the class is written to the file
<code>bernoulli.hpp</code> in the current directory. The final argument,
<code>bernoulli.stan</code>, is the file from which to read the Stan
program.</p>
<p>In practice, st