[INFO] updating cached repository jetSett/Elliptic-curve-algorithms
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/jetSett/Elliptic-curve-algorithms
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/jetSett/Elliptic-curve-algorithms" "work/ex/beta-1.38-1/sources/1.37.0/gh/jetSett/Elliptic-curve-algorithms"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/jetSett/Elliptic-curve-algorithms'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/jetSett/Elliptic-curve-algorithms" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jetSett/Elliptic-curve-algorithms"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jetSett/Elliptic-curve-algorithms'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] e54dc3a7f9d18ce66923da74932dcd00757ad732
[INFO] sha for GitHub repo jetSett/Elliptic-curve-algorithms: e54dc3a7f9d18ce66923da74932dcd00757ad732
[INFO] validating manifest of jetSett/Elliptic-curve-algorithms 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 jetSett/Elliptic-curve-algorithms 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 jetSett/Elliptic-curve-algorithms
[INFO] finished frobbing jetSett/Elliptic-curve-algorithms
[INFO] frobbed toml for jetSett/Elliptic-curve-algorithms written to work/ex/beta-1.38-1/sources/1.37.0/gh/jetSett/Elliptic-curve-algorithms/Cargo.toml
[INFO] started frobbing jetSett/Elliptic-curve-algorithms
[INFO] finished frobbing jetSett/Elliptic-curve-algorithms
[INFO] frobbed toml for jetSett/Elliptic-curve-algorithms written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jetSett/Elliptic-curve-algorithms/Cargo.toml
[INFO] crate jetSett/Elliptic-curve-algorithms 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 jetSett/Elliptic-curve-algorithms 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-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/jetSett/Elliptic-curve-algorithms:/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] b9352a825b62b9c39fcf538f46a6a6618b3097b3d7c08face955bb53b17c2e4e
[INFO] running `"docker" "start" "-a" "b9352a825b62b9c39fcf538f46a6a6618b3097b3d7c08face955bb53b17c2e4e"`
[INFO] [stderr]    Compiling rust-gmp v0.5.0
[INFO] [stderr]    Compiling elliptic_curve_algorithms 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(specialization)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `gmp::mpz::Mpz`
[INFO] [stderr]  --> src/finite_fields.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use gmp::mpz::Mpz;
[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 `elliptic_curve_algorithms`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "b9352a825b62b9c39fcf538f46a6a6618b3097b3d7c08face955bb53b17c2e4e"`
[INFO] running `"docker" "rm" "-f" "b9352a825b62b9c39fcf538f46a6a6618b3097b3d7c08face955bb53b17c2e4e"`
[INFO] [stdout] b9352a825b62b9c39fcf538f46a6a6618b3097b3d7c08face955bb53b17c2e4e