n> <span class='ident'>change_truth</span>(<span class='ident'>x</span>: <span class='ident'>bool</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
    <span class='op'>!</span><span class='ident'>x</span>
}</pre>

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<p>もし <code>Copy</code> トレイトを実装していない型を使っていたならば、ムーブした値を