[INFO] updating cached repository steveorsomethin/rust-ml
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/steveorsomethin/rust-ml
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/steveorsomethin/rust-ml" "work/ex/beta-1.38-1/sources/1.37.0/gh/steveorsomethin/rust-ml"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/steveorsomethin/rust-ml'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/steveorsomethin/rust-ml" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/steveorsomethin/rust-ml"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/steveorsomethin/rust-ml'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 45220b6b329ccaa9fb6fd6837cddccb418b33cc0
[INFO] sha for GitHub repo steveorsomethin/rust-ml: 45220b6b329ccaa9fb6fd6837cddccb418b33cc0
[INFO] validating manifest of steveorsomethin/rust-ml 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 steveorsomethin/rust-ml 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 steveorsomethin/rust-ml
[INFO] finished frobbing steveorsomethin/rust-ml
[INFO] frobbed toml for steveorsomethin/rust-ml written to work/ex/beta-1.38-1/sources/1.37.0/gh/steveorsomethin/rust-ml/Cargo.toml
[INFO] started frobbing steveorsomethin/rust-ml
[INFO] finished frobbing steveorsomethin/rust-ml
[INFO] frobbed toml for steveorsomethin/rust-ml written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/steveorsomethin/rust-ml/Cargo.toml
[INFO] crate steveorsomethin/rust-ml 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] [stderr] error: the lock file /mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/steveorsomethin/rust-ml/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 steveorsomethin/rust-ml against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/steveorsomethin/rust-ml:/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 3cc55a0ed6320bf73bc59b3adb272737d98171fb4f4e7ef8ae1b69c6b310c690
[INFO] running `"docker" "start" "-a" "3cc55a0ed6320bf73bc59b3adb272737d98171fb4f4e7ef8ae1b69c6b310c690"`
[INFO] [stderr]    Compiling rust-ml v0.0.1 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/main.rs:11:1
[INFO] [stderr]    |
[INFO] [stderr] 11 | #![feature(convert)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^
[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 `rust-ml`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "3cc55a0ed6320bf73bc59b3adb272737d98171fb4f4e7ef8ae1b69c6b310c690"`
[INFO] running `"docker" "rm" "-f" "3cc55a0ed6320bf73bc59b3adb272737d98171fb4f4e7ef8ae1b69c6b310c690"`
[INFO] [stdout] 3cc55a0ed6320bf73bc59b3adb272737d98171fb4f4e7ef8ae1b69c6b310c690