an><span class=special>(</span><span class=literal>'a'</span><span class=special>),
    </span><span class=identifier>b </span><span class=special>= </span><span class=identifier>ch_p</span><span class=special>(</span><span class=literal>'b'</span><span class=special>),
    </span><span class=identifier>c </span><span class=special>= </span><span class=identifier>ch_p</span><span class=special>(</span><span class=literal>'c'</span><span class=special>), </span><span class=comment>// BAD, trailing comma</spa