[INFO] cloning repository https://github.com/not-matthias/probable-computing-machine
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/not-matthias/probable-computing-machine" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnot-matthias%2Fprobable-computing-machine", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnot-matthias%2Fprobable-computing-machine'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9b9c2dd13360dc8adbcc50800521006eb12e5147
[INFO] testing not-matthias/probable-computing-machine against 1.60.0 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnot-matthias%2Fprobable-computing-machine" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/not-matthias/probable-computing-machine on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/not-matthias/probable-computing-machine
[INFO] finished tweaking git repo https://github.com/not-matthias/probable-computing-machine
[INFO] tweaked toml for git repo https://github.com/not-matthias/probable-computing-machine written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/not-matthias/probable-computing-machine already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "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-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "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] 09aae05898093a626f16f201fecea4f1d7932674c2cb4f17035cf690ab3fea0e
[INFO] running `Command { std: "docker" "start" "-a" "09aae05898093a626f16f201fecea4f1d7932674c2cb4f17035cf690ab3fea0e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "09aae05898093a626f16f201fecea4f1d7932674c2cb4f17035cf690ab3fea0e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "09aae05898093a626f16f201fecea4f1d7932674c2cb4f17035cf690ab3fea0e", kill_on_drop: false }`
[INFO] [stdout] 09aae05898093a626f16f201fecea4f1d7932674c2cb4f17035cf690ab3fea0e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", 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] 295e6060f5e681e81c06662c6b9b4b6b0735d70050b9e085423bd85c94e964bf
[INFO] running `Command { std: "docker" "start" "-a" "295e6060f5e681e81c06662c6b9b4b6b0735d70050b9e085423bd85c94e964bf", kill_on_drop: false }`
[INFO] [stderr]    Compiling probable-computing-machine v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(lang_items)]
[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 `probable-computing-machine` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "295e6060f5e681e81c06662c6b9b4b6b0735d70050b9e085423bd85c94e964bf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "295e6060f5e681e81c06662c6b9b4b6b0735d70050b9e085423bd85c94e964bf", kill_on_drop: false }`
[INFO] [stdout] 295e6060f5e681e81c06662c6b9b4b6b0735d70050b9e085423bd85c94e964bf