title: Tracing a deprecation warning
body: <p>I am receiving this warning in my program, I have recently updated to Node 10 and I'm trying to figure out the source of the deprecation warning:</p>
  
  <p><code>[DEP0079] DeprecationWarning: Custom inspection function on Objects via .inspect() is deprecated</code></p>
  
  <p>How can I trace where this error originates?</p>
  
  <p>PS. I've tried <code>--trace-warnings</code> and <code>--trace-deprecation</code> on the CLI, getting no luck</p>