[INFO] cloning repository https://github.com/ryw89/arks
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ryw89/arks" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fryw89%2Farks", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fryw89%2Farks'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] cf312cb7d0646ab34edc8a53956c32208d2d5060
[INFO] testing ryw89/arks against beta-2022-04-10 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fryw89%2Farks" "/workspace/builds/worker-27/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-27/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ryw89/arks on toolchain beta-2022-04-10
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ryw89/arks
[INFO] finished tweaking git repo https://github.com/ryw89/arks
[INFO] tweaked toml for git repo https://github.com/ryw89/arks written to /workspace/builds/worker-27/source/Cargo.toml
[INFO] crate git repo https://github.com/ryw89/arks already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 72f6c01310cc25ba002a587d0239352408da619b1c7efe6fe05780a05d2e8cd9
[INFO] running `Command { std: "docker" "start" "-a" "72f6c01310cc25ba002a587d0239352408da619b1c7efe6fe05780a05d2e8cd9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "72f6c01310cc25ba002a587d0239352408da619b1c7efe6fe05780a05d2e8cd9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "72f6c01310cc25ba002a587d0239352408da619b1c7efe6fe05780a05d2e8cd9", kill_on_drop: false }`
[INFO] [stdout] 72f6c01310cc25ba002a587d0239352408da619b1c7efe6fe05780a05d2e8cd9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 56160c1162aab39c5ef76ac2456856840c16707140e31260f24a591b1216c876
[INFO] running `Command { std: "docker" "start" "-a" "56160c1162aab39c5ef76ac2456856840c16707140e31260f24a591b1216c876", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.32
[INFO] [stderr]    Compiling libc v0.2.108
[INFO] [stderr]    Compiling syn v1.0.81
[INFO] [stderr]    Compiling version_check v0.9.3
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling futures-core v0.3.18
[INFO] [stderr]    Compiling futures-channel v0.3.18
[INFO] [stderr]    Compiling futures-task v0.3.18
[INFO] [stderr]    Compiling futures-sink v0.3.18
[INFO] [stderr]    Compiling pkg-config v0.3.22
[INFO] [stderr]    Compiling ident_case v1.0.1
[INFO] [stderr]    Compiling futures-util v0.3.18
[INFO] [stderr]    Compiling fnv v1.0.7
[INFO] [stderr]    Compiling cc v1.0.72
[INFO] [stderr]    Compiling pin-utils v0.1.0
[INFO] [stderr]    Compiling futures-io v0.3.18
[INFO] [stderr]    Compiling crc32fast v1.2.1
[INFO] [stderr]    Compiling slab v0.4.5
[INFO] [stderr]    Compiling pin-project-lite v0.2.7
[INFO] [stderr]    Compiling unicode-segmentation v1.8.0
[INFO] [stderr]    Compiling ppv-lite86 v0.2.15
[INFO] [stderr]    Compiling event-listener v2.5.1
[INFO] [stderr]    Compiling async-trait v0.1.51
[INFO] [stderr]    Compiling adler v1.0.2
[INFO] [stderr]    Compiling unicode-width v0.1.9
[INFO] [stderr]    Compiling nix v0.17.0
[INFO] [stderr]    Compiling vec_map v0.8.2
[INFO] [stderr]    Compiling cached_proc_macro_types v0.1.0
[INFO] [stderr]    Compiling once_cell v1.8.0
[INFO] [stderr]    Compiling remove_dir_all v0.5.3
[INFO] [stderr]    Compiling byteorder v1.4.3
[INFO] [stderr]    Compiling mime v0.3.16
[INFO] [stderr]    Compiling void v1.0.2
[INFO] [stderr]    Compiling miniz_oxide v0.4.4
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling async-mutex v1.4.0
[INFO] [stderr]    Compiling async-rwlock v1.3.0
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling unicase v2.6.0
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling heck v0.3.3
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]    Compiling bzip2-sys v0.1.11+1.0.8
[INFO] [stderr]    Compiling mime_guess v2.0.3
[INFO] [stderr]    Compiling getrandom v0.2.3
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling xattr v0.2.2
[INFO] [stderr]    Compiling time v0.1.43
[INFO] [stderr]    Compiling flate2 v1.0.22
[INFO] [stderr]    Compiling filetime v0.2.15
[INFO] [stderr]    Compiling clap v2.33.3
[INFO] [stderr]    Compiling colored v2.0.0
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling tar v0.4.37
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling bzip2 v0.4.3
[INFO] [stderr]    Compiling rand v0.8.4
[INFO] [stderr]    Compiling tempfile v3.2.0
[INFO] [stderr]    Compiling darling_core v0.13.0
[INFO] [stderr]    Compiling futures-macro v0.3.18
[INFO] [stderr]    Compiling thiserror-impl v1.0.30
[INFO] [stderr]    Compiling structopt-derive v0.4.18
[INFO] [stderr]    Compiling darling_macro v0.13.0
[INFO] [stderr]    Compiling structopt v0.3.25
[INFO] [stderr]    Compiling darling v0.13.0
[INFO] [stderr]    Compiling thiserror v1.0.30
[INFO] [stderr]    Compiling cached_proc_macro v0.7.1
[INFO] [stderr]    Compiling zip v0.5.13
[INFO] [stderr]    Compiling futures-executor v0.3.18
[INFO] [stderr]    Compiling futures v0.3.18
[INFO] [stderr]    Compiling cached v0.26.2
[INFO] [stderr]    Compiling arks v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(mutex_unlock)]
[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 `arks` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "56160c1162aab39c5ef76ac2456856840c16707140e31260f24a591b1216c876", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "56160c1162aab39c5ef76ac2456856840c16707140e31260f24a591b1216c876", kill_on_drop: false }`
[INFO] [stdout] 56160c1162aab39c5ef76ac2456856840c16707140e31260f24a591b1216c876