[INFO] fetching crate guff-sharefiles 0.1.11...
[INFO] testing guff-sharefiles-0.1.11 against 1.55.0 for beta-1.56-1
[INFO] extracting crate guff-sharefiles 0.1.11 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate guff-sharefiles 0.1.11 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 guff-sharefiles 0.1.11
[INFO] finished tweaking crates.io crate guff-sharefiles 0.1.11
[INFO] tweaked toml for crates.io crate guff-sharefiles 0.1.11 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate crates.io crate guff-sharefiles 0.1.11 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded guff-matrix v0.1.12
[INFO] [stderr]   Downloaded guff-ida v0.1.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 721a671be6f889e5647731853633736f6510417a4f1febc7c7701ecbe9bf5b57
[INFO] running `Command { std: "docker" "start" "-a" "721a671be6f889e5647731853633736f6510417a4f1febc7c7701ecbe9bf5b57", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "721a671be6f889e5647731853633736f6510417a4f1febc7c7701ecbe9bf5b57", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "721a671be6f889e5647731853633736f6510417a4f1febc7c7701ecbe9bf5b57", kill_on_drop: false }`
[INFO] [stdout] 721a671be6f889e5647731853633736f6510417a4f1febc7c7701ecbe9bf5b57
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] 1460b920ef16afd1d66e0cd48f9ba5dc393101ab5dd503bfb5ce0cb9a08a16e6
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "1460b920ef16afd1d66e0cd48f9ba5dc393101ab5dd503bfb5ce0cb9a08a16e6", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-bigint v0.4.0
[INFO] [stderr]    Compiling num-rational v0.4.0
[INFO] [stderr]    Compiling num-complex v0.4.0
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]    Compiling num v0.4.0
[INFO] [stderr]    Compiling guff v0.1.7
[INFO] [stderr]    Compiling guff-ida v0.1.3
[INFO] [stderr]    Compiling guff-matrix v0.1.12
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/guff-matrix-0.1.12/src/lib.rs:53:1
[INFO] [stdout]    |
[INFO] [stdout] 53 | #![feature(stdsimd)]
[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 `guff-matrix` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "1460b920ef16afd1d66e0cd48f9ba5dc393101ab5dd503bfb5ce0cb9a08a16e6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1460b920ef16afd1d66e0cd48f9ba5dc393101ab5dd503bfb5ce0cb9a08a16e6", kill_on_drop: false }`
[INFO] [stdout] 1460b920ef16afd1d66e0cd48f9ba5dc393101ab5dd503bfb5ce0cb9a08a16e6