ode>Iter</code> can be updated to pass a closure to <code>Do</code> to achieve the same effect.
</p>

<h3 id="flag">The flag package</h3>

<p>
In Go 1, the interface <a href="/pkg/flag/#Value"><code>flag.Value</code></a> has changed slightly.
The <code>Set</code> method now returns an <code>error</code> instead of
a <code>bool</code> to indicate success or failure.
</p>

<p>
There is also a new kind of flag, <code>Duration</code>, to support argument
values specifying time intervals.
Values for such flags m