Auto merge of #37386 - johnthagen:Self-reference-example, r=GuillaumeGomez

Add example using Self to reference

When I first came across `Self` I had a hard time finding references to it in the docs (and it's also been asked about on [StackOverflow](http://stackoverflow.com/questions/32304595/whats-the-difference-between-self-and-self).

I hope this example provides someone who comes across it for the first time a little more help.  If there is a better way to show an example actually using `Self`, I'm happy to modify this.  It was just the simplest place to start I could see.

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