This repo contains the code samples from the blog post "revisiting implicits without import tax" which you can find here:
http://eed3si9n.com/revisiting-implicits-without-import-tax
The post is a detailed review on Scala implicits. It was written in 2011 testing implicit parameter resolution in Scala 2.9.
I copied and pasted (and slightly modified) the code from the post in order to see how resolution of implicit parameters behaves in Scala 2.12.