title: How can I calculate power of two BigInts/BigUints?
body: <p>The title says it all. I tried to find something in the Rust docs but the only thing I came across is this function for the BigInt/Biguint structs.</p>
  <pre><code>pub fn modpow(&amp;self, exponent: &amp;Self, modulus: &amp;Self) -&gt; Self
  </code></pre>
  <p>I also found this function in the num::pow but it doesn't help me as my exp is BigInt/BigUint too.</p>
  <pre><code>pub fn pow&lt;T&gt;(base: T, exp: usize) -&gt; T
  </code></pre>
  <p>So, anyone has any idea? I'm thinking that I should use the modpow function somehow, but what do I send for the modulus parameter?</p>