em>:
Code that uses the old methods will fail to compile and must be updated by hand.
The semantic change makes it difficult for the fix tool to update automatically.
</p>

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

<p>
The <code>Time</code> function has been removed; callers should use
the <a href="/pkg/time/#Time"><code>Time</code></a> type from the
<code>time</code> package.
</p>

<p>
The <code>Exec</code> function has been removed; callers should use
<code>Exec</code> from the <code>syscall</code> package, where 