[INFO] updating cached repository crypto-universe/SPECK
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/crypto-universe/SPECK
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/crypto-universe/SPECK" "work/ex/beta-1.38-1/sources/1.37.0/gh/crypto-universe/SPECK"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/crypto-universe/SPECK'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/crypto-universe/SPECK" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/crypto-universe/SPECK"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/crypto-universe/SPECK'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 5a116bd54495fedf72c08bbb41902fb54adf4499
[INFO] sha for GitHub repo crypto-universe/SPECK: 5a116bd54495fedf72c08bbb41902fb54adf4499
[INFO] validating manifest of crypto-universe/SPECK on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of crypto-universe/SPECK on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing crypto-universe/SPECK
[INFO] finished frobbing crypto-universe/SPECK
[INFO] frobbed toml for crypto-universe/SPECK written to work/ex/beta-1.38-1/sources/1.37.0/gh/crypto-universe/SPECK/Cargo.toml
[INFO] started frobbing crypto-universe/SPECK
[INFO] finished frobbing crypto-universe/SPECK
[INFO] frobbed toml for crypto-universe/SPECK written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/crypto-universe/SPECK/Cargo.toml
[INFO] crate crypto-universe/SPECK already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing crypto-universe/SPECK against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/crypto-universe/SPECK:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 71b89625088967259edf3546d9cdff8df11af4bb8085ca5d146a15bd2a868b22
[INFO] running `"docker" "start" "-a" "71b89625088967259edf3546d9cdff8df11af4bb8085ca5d146a15bd2a868b22"`
[INFO] [stderr]    Compiling speck v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(i128_type)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `pkcs7::PKCS7`
[INFO] [stderr]  --> src/cbc.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use pkcs7::PKCS7;
[INFO] [stderr]   |     ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `speck`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "71b89625088967259edf3546d9cdff8df11af4bb8085ca5d146a15bd2a868b22"`
[INFO] running `"docker" "rm" "-f" "71b89625088967259edf3546d9cdff8df11af4bb8085ca5d146a15bd2a868b22"`
[INFO] [stdout] 71b89625088967259edf3546d9cdff8df11af4bb8085ca5d146a15bd2a868b22