script:
- |
rm rust-toolchain
- cargo install rustup-toolchain-install-master || echo "rustup-toolchain-install-master already installed"
+ cargo install rustup-toolchain-install-master --debug || echo "rustup-toolchain-install-master already installed"
RUSTC_HASH=$(git ls-remote https://github.com/rust-lang/rust.git master | awk '{print $1}')
travis_retry rustup-toolchain-install-master -f -n master $RUSTC_HASH
rustup default master