title: How can I only show warnings if there are no errors?
body: <p>Often during development, I have a bunch of unused imports and variables. I like to fix those <em>after</em> I have correctly working code. The warnings these generate cause me to scroll though the <code>cargo build</code> output to find errors among all the warnings.</p>
  
  <p>Is that possible to only show the warnings if compilation succeeds?</p>
  
  <p>I don't want to <em>ignore</em> the warnings entirely, since I do want to solve them before committing the code.</p>