tree cd1da5a0b092ec4f8e88cb46e4c39165e2f98744
parent 9de18e59079ef97d6e0e508eca04fcc3f8caf298
author Rob Tsuk <robtsuk@google.com> 1535396456 -0700
committer Rob Tsuk <robtsuk@google.com> 1535398274 -0700

Update to the Rust 2018 edition

Testing: cargo test plus build spinning_square_rs.

Change-Id: Id4b80979ce30266d4a4f0fd432c3fddba1296a56