From 32ed22c3e2e257aad7a72e65d43dae4b29f9ff48 Mon Sep 17 00:00:00 2001
From: Marcel Hlopko <hlopko@google.com>
Date: Mon, 22 Oct 2018 12:37:01 +0200
Subject: [PATCH] Migrate rules_rust to the new Starlark C++ toolchain API
 (#133)

This is needed for rules_rust to be forward compatible with Bazel 0.20.
Tracking issues for migration:

* https://github.com/bazelbuild/bazel/issues/6380
* https://github.com/bazelbuild/bazel/issues/6434

Fixes #131.