xpansion (can be disabled with <code>REFL_NO_VARIADICS</code>) <div class="fragment"><div class="line">REFL_AUTO</div>
<div class="line">(</div>
<div class="line">    type(User), <span class="comment">// expands to REFL_TYPE(User)</span></div>
<div class="line">    field(<span class="keywordtype">id</span>, property(read_only)), <span class="comment">// expands to REFL_FIELD(id, property(read_only))</span></div>
<div class="line">    field(email),</div>
<div class="line">    field(first_name, property(<span