How can I create enums with constant values in Rust?
<p>I can do this:</p>

<pre><code>enum MyEnum {
    A(i32),
    B(i32),
}
</code></pre>

<p>but not this:</p>

<pre><code>enum MyEnum {
    A(123), // 123 is a constant
    B(456), // 456 is a constant
}
</code></pre>

<p>I can create the structures for <code>A</code> and <code>B</code> with a single field and then implement that field, but I think there might be an easier way. Is there any?</p>