ing range loops to select an element from a map.
</p>

<pre><!--{{code "/doc/progs/go1.go" `/Sunday/` `/^	}/`}}
-->    m := map[string]int{&#34;Sunday&#34;: 0, &#34;Monday&#34;: 1}
    for name, value := range m {
        <span class="comment">// This loop should not assume Sunday will be visited first.</span>
        f(name, value)
    }</pre>

<p>
<em>Updating</em>:
This is one change where tools cannot help.  Most existing code
will be unaffected, but some programs may break or misbehave; we
recommend ma