Rewriter for index operator methods

(Example code for my talk presented at dotGo 2016, Paris)

This is a clone of https://github.com/golang/go at commit 404ae84.

The subsequent commits illustrate the creation of the rewriter used to prototype programmable indexing operators as presented in the talk.

As for the Go project, unless otherwise noted, the Go source files are distributed under the BSD-style license found in the LICENSE file.

This repo is for illustration purposes only; it is not actively maintained, and I won't accept pull requests.

Enjoy!