[INFO] fetching crate eth_checksum 0.1.2...
[INFO] testing eth_checksum-0.1.2 against 1.55.0 for beta-1.56-1
[INFO] extracting crate eth_checksum 0.1.2 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate eth_checksum 0.1.2 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate eth_checksum 0.1.2
[INFO] finished tweaking crates.io crate eth_checksum 0.1.2
[INFO] tweaked toml for crates.io crate eth_checksum 0.1.2 written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] crate crates.io crate eth_checksum 0.1.2 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b460d21fbb508dd65d2450c283369bea5eeb6c79478cb043a2924d120f5d53be
[INFO] running `Command { std: "docker" "start" "-a" "b460d21fbb508dd65d2450c283369bea5eeb6c79478cb043a2924d120f5d53be", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b460d21fbb508dd65d2450c283369bea5eeb6c79478cb043a2924d120f5d53be", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b460d21fbb508dd65d2450c283369bea5eeb6c79478cb043a2924d120f5d53be", kill_on_drop: false }`
[INFO] [stdout] b460d21fbb508dd65d2450c283369bea5eeb6c79478cb043a2924d120f5d53be
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e878c6c672bc9906b9f7f1bc4b4b1023924c5af1877632e00494ce10ad3c9499
[INFO] running `Command { std: "docker" "start" "-a" "e878c6c672bc9906b9f7f1bc4b4b1023924c5af1877632e00494ce10ad3c9499", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.68
[INFO] [stderr]    Compiling gcc v0.3.55
[INFO] [stderr]    Compiling rust-crypto v0.2.36
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling time v0.1.42
[INFO] [stderr]    Compiling rand v0.3.23
[INFO] [stderr]    Compiling eth_checksum v0.1.2 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.31s
[INFO] running `Command { std: "docker" "inspect" "e878c6c672bc9906b9f7f1bc4b4b1023924c5af1877632e00494ce10ad3c9499", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e878c6c672bc9906b9f7f1bc4b4b1023924c5af1877632e00494ce10ad3c9499", kill_on_drop: false }`
[INFO] [stdout] e878c6c672bc9906b9f7f1bc4b4b1023924c5af1877632e00494ce10ad3c9499
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bd11a3d447dedc92701d1b7e4b7c3ce3936be119ea886825a1fa7b65e70526ca
[INFO] running `Command { std: "docker" "start" "-a" "bd11a3d447dedc92701d1b7e4b7c3ce3936be119ea886825a1fa7b65e70526ca", kill_on_drop: false }`
[INFO] [stderr]    Compiling eth_checksum v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:31
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![cfg_attr(any(test, bench), feature(test))]
[INFO] [stdout]   |                               ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `eth_checksum` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "bd11a3d447dedc92701d1b7e4b7c3ce3936be119ea886825a1fa7b65e70526ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bd11a3d447dedc92701d1b7e4b7c3ce3936be119ea886825a1fa7b65e70526ca", kill_on_drop: false }`
[INFO] [stdout] bd11a3d447dedc92701d1b7e4b7c3ce3936be119ea886825a1fa7b65e70526ca