='ident'>hello</span> <span class='op'>=</span> <span class='string'>&quot;Hello &quot;</span>.<span class='ident'>to_string</span>();
<span class='kw'>let</span> <span class='ident'>world</span> <span class='op'>=</span> <span class='string'>&quot;world!&quot;</span>;

<span class='kw'>let</span> <span class='ident'>hello_world</span> <span class='op'>=</span> <span class='ident'>hello</span> <span class='op'>+</span> <span class='ident'>world</span>;</pre>

<!-- But if you have two `String`s, you need an 