<p>I don't know Rust, but I assume <code>String</code> is a library type, like presumably many other types from the standard library which aren't listed (maps, vectors, etc.). From <a href="https://doc.rust-lang.org/std/string/struct.String.html" rel="nofollow">Rust docs</a>:</p>
<blockquote>
<p>The String type is the most common string type that has ownership over the contents of the string. It has a close relationship with its borrowed counterpart, the primitive str.</p>
</blockquote>

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