Help test out the 2018 module system changes!

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I tried this out, and it was generally simple and great - looking forward to much more of this style up upgrade in the future!

The only shortcoming I ran into is that it didn’t remove any extern crates for me. I tried each of:

  1. Run cargo +nightly fix --prepare-for 2018 --all-targets --all-features --allow-dirty without any local changes
  2. Add #![feature(rust_2018_preview)] and then do 1.
  3. Add the edition to the Cargo.toml, and then do 2.

Is something expected to remove extern crates? I also didn’t see any warnings about unused ones, but if I removed them myself the code compiled the same…

Thanks!