[INFO] updating cached repository bartsmykla/codewars
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/bartsmykla/codewars
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/bartsmykla/codewars" "work/ex/beta-1.38-1/sources/1.37.0/gh/bartsmykla/codewars"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/bartsmykla/codewars'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/bartsmykla/codewars" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/bartsmykla/codewars"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/bartsmykla/codewars'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 6e54ea175339e2eeea1dec3a775a137c542db26c
[INFO] sha for GitHub repo bartsmykla/codewars: 6e54ea175339e2eeea1dec3a775a137c542db26c
[INFO] validating manifest of bartsmykla/codewars 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 bartsmykla/codewars 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 bartsmykla/codewars
[INFO] finished frobbing bartsmykla/codewars
[INFO] frobbed toml for bartsmykla/codewars written to work/ex/beta-1.38-1/sources/1.37.0/gh/bartsmykla/codewars/Cargo.toml
[INFO] started frobbing bartsmykla/codewars
[INFO] finished frobbing bartsmykla/codewars
[INFO] frobbed toml for bartsmykla/codewars written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/bartsmykla/codewars/Cargo.toml
[INFO] crate bartsmykla/codewars 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 bartsmykla/codewars 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-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/bartsmykla/codewars:/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] a41e42f1f7950d1f658b2df23be06836f3a07ecd659e636d71c4f4a3c0ce2e6e
[INFO] running `"docker" "start" "-a" "a41e42f1f7950d1f658b2df23be06836f3a07ecd659e636d71c4f4a3c0ce2e6e"`
[INFO] [stderr]    Compiling codewars 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(as_cell, test)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/katas/k6_easy_balance_checking.rs:65:61
[INFO] [stderr]    |
[INFO] [stderr] 65 | fn parse_line(line: &str, balance: f64) -> Result<Line, Box<Error>> {
[INFO] [stderr]    |                                                             ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(bare_trait_objects)] 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 `codewars`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "a41e42f1f7950d1f658b2df23be06836f3a07ecd659e636d71c4f4a3c0ce2e6e"`
[INFO] running `"docker" "rm" "-f" "a41e42f1f7950d1f658b2df23be06836f3a07ecd659e636d71c4f4a3c0ce2e6e"`
[INFO] [stdout] a41e42f1f7950d1f658b2df23be06836f3a07ecd659e636d71c4f4a3c0ce2e6e