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            <h1>변수 업데이트</h1>
            <p>Rust는 변수가 변경 가능한지 여부에 대해 많은 주의를 기울입니다.</p>
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<li><strong>mutable (가변)</strong> - 컴파일러는 해당 변수에 대해 <code>쓰거나 읽을 수</code> 있도록 허용합니다.</li>
<li><strong>immutable (불변)</strong> - 컴파일러는 해당 변수에 대해서 <code>읽기만</code> 가능하도록 허용합니다.</li>
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<p>가변 값은 <strong>mut</strong> 키워드로 구분됩니다.</p>
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