p>

<pre><!--{{code "/doc/progs/go1.go" `/sa :=/` `/then sc.0. = 2/`}}
-->    sa := []int{1, 2, 3}
    i := 0
    i, sa[i] = 1, 2 <span class="comment">// sets i = 1, sa[0] = 2</span>

    sb := []int{1, 2, 3}
    j := 0
    sb[j], j = 2, 1 <span class="comment">// sets sb[0] = 2, j = 1</span>

    sc := []int{1, 2, 3}
    sc[0], sc[0] = 1, 2 <span class="comment">// sets sc[0] = 1, then sc[0] = 2 (so sc[0] = 2 at end)</span></pre>

<p>
<em>Updating</em>:
This is one change where tools cannot help, but brea