title: error: a bin target must be available for `cargo run`
body: <p>I am quite new using Rust language. I try to execute this cargo project/lib from github repository.</p>
  
  <p><a href="https://github.com/smallnest/benchpi" rel="nofollow noreferrer">https://github.com/smallnest/benchpi</a></p>
  
  <p>However, after cloning and run <code>cargo run</code>, I got this error <code>error: a bin target must be available for 'cargo run'</code></p>
  
  <p>How to properly run this cargo library? Thanks.</p>