/span>(<span class="ident">e</span>)),
            <span class="prelude-val">Ok</span>((<span class="ident">i2</span>,<span class="kw">_</span>))    <span class="op">=&gt;</span> <span class="prelude-val">Ok</span>((<span class="ident">i2</span>, <span class="ident">o</span>))
          }
        }
      }
    }
  )
);

<span class="macro">named</span><span class="macro">!</span>(<span class="ident">tuple</span><span class="op">&lt;</span><span class="kw-2">&amp;</span>[<span class="ident">u8</span>], (<spa