Commits
Chao Sun authored and Wes McKinney committed e58645358db
ARROW-4680: [CI] [Rust] Travis CI builds fail with latest Rust 1.34.0… …-nightly (2019-02-25) Author: Chao Sun <sunchao@apache.org> Closes #3756 from sunchao/ARROW-4680 and squashes the following commits: 1f281336 <Chao Sun> ARROW-4680: Travis CI builds fail with latest Rust 1.34.0-nightly (2019-02-25)