message: rustup.sh: CI uses stable
diff: set -ex
  export TRAVIS_RUST_VERSION
  -for TRAVIS_RUST_VERSION in 1.8.0 1.15.0 beta nightly; do
  +for TRAVIS_RUST_VERSION in 1.8.0 stable beta nightly; do
  run="rustup run $TRAVIS_RUST_VERSION"
  if [ "$TRAVIS_RUST_VERSION" = 1.8.0 ]; then
  # libc 0.2.34 started using #[deprecated]
  