lass="ident">nom</span>::<span class="prelude-val">Err</span>;

      <span class="kw">match</span> <span class="macro">sep</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>, <span class="ident">space</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">args</span>)<span class="kw-2">*</span>) {
        <span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=&gt;</span> <span class="pr