[INFO] fetching crate singleton-manager 0.1.3...
[INFO] testing singleton-manager-0.1.3 against beta-2022-04-10 for beta-1.61-1
[INFO] extracting crate singleton-manager 0.1.3 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate singleton-manager 0.1.3 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] removed /workspace/builds/worker-6/source/rust-toolchain
[INFO] started tweaking crates.io crate singleton-manager 0.1.3
[INFO] finished tweaking crates.io crate singleton-manager 0.1.3
[INFO] tweaked toml for crates.io crate singleton-manager 0.1.3 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f5a35b66850492817e7692286f6c53b562cb04557eed08723f4069ec1b0dea4e
[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" "f5a35b66850492817e7692286f6c53b562cb04557eed08723f4069ec1b0dea4e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f5a35b66850492817e7692286f6c53b562cb04557eed08723f4069ec1b0dea4e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f5a35b66850492817e7692286f6c53b562cb04557eed08723f4069ec1b0dea4e", kill_on_drop: false }`
[INFO] [stdout] f5a35b66850492817e7692286f6c53b562cb04557eed08723f4069ec1b0dea4e
[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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9dfdfafbddec8401dc11c601eb5d60fa0e7ac6287622d9cffe880d44e8a34515
[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" "9dfdfafbddec8401dc11c601eb5d60fa0e7ac6287622d9cffe880d44e8a34515", kill_on_drop: false }`
[INFO] [stderr]    Compiling uuid v0.8.2
[INFO] [stderr]    Compiling singleton-manager v0.1.3 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(fn_traits)]
[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 `singleton-manager` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "9dfdfafbddec8401dc11c601eb5d60fa0e7ac6287622d9cffe880d44e8a34515", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9dfdfafbddec8401dc11c601eb5d60fa0e7ac6287622d9cffe880d44e8a34515", kill_on_drop: false }`
[INFO] [stdout] 9dfdfafbddec8401dc11c601eb5d60fa0e7ac6287622d9cffe880d44e8a34515