How do I print variables in Rust and have it show everything about that variable, like Ruby's .inspect?
<pre><code>use std::collections::HashMap;

fn main() {
    let mut hash = HashMap::new();
    hash.insert("Daniel", "798-1364");
    println!("{}", hash);
}
</code></pre>

<p>will fail to compile:</p>

<pre class="lang-none prettyprint-override"><code>error[E0277]: `std::collections::HashMap&lt;&amp;str, &amp;str&gt;` doesn't implement `std::fmt::Display`
 --&gt; src/main.rs:6:20
  |
6 |     println!("{}", hash);
  |                    ^^^^ `std::collections::HashMap&lt;&amp;str, &amp;str&gt;` cannot be formatted with the default formatter
  |
</code></pre>

<p>Is there a way to say something like:</p>

<pre><code>println!("{}", hash.inspect());
</code></pre>

<p>and have it print out:</p>

<pre class="lang-none prettyprint-override"><code>1) "Daniel" =&gt; "798-1364"
</code></pre>