[INFO] cloning repository https://github.com/lpeterse/rsynth
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/lpeterse/rsynth" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flpeterse%2Frsynth", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flpeterse%2Frsynth'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] aa58b23737e24b0fe1ebd04e16f8964d154d045b
[INFO] testing lpeterse/rsynth against beta-2021-09-08 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flpeterse%2Frsynth" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/lpeterse/rsynth on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/lpeterse/rsynth
[INFO] finished tweaking git repo https://github.com/lpeterse/rsynth
[INFO] tweaked toml for git repo https://github.com/lpeterse/rsynth written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/lpeterse/rsynth already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "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 libpulse-sys v1.13.0
[INFO] [stderr]   Downloaded libpulse-binding v2.16.0
[INFO] [stderr]   Downloaded libpulse-simple-sys v1.13.0
[INFO] [stderr]   Downloaded libpulse-simple-binding v2.16.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 63ab034700d54139d4362b5a3e37495ee1f884314665bb64950fef7426038771
[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" "63ab034700d54139d4362b5a3e37495ee1f884314665bb64950fef7426038771", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "63ab034700d54139d4362b5a3e37495ee1f884314665bb64950fef7426038771", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "63ab034700d54139d4362b5a3e37495ee1f884314665bb64950fef7426038771", kill_on_drop: false }`
[INFO] [stdout] 63ab034700d54139d4362b5a3e37495ee1f884314665bb64950fef7426038771
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "+beta-2021-09-08" "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] 0e1e4818fdbba6fa6ba14857b84bc7b49d9019bd053e3b47695e01017805966f
[INFO] running `Command { std: "docker" "start" "-a" "0e1e4818fdbba6fa6ba14857b84bc7b49d9019bd053e3b47695e01017805966f", kill_on_drop: false }`
[INFO] [stderr]    Compiling libpulse-sys v1.13.0
[INFO] [stderr]    Compiling libpulse-simple-sys v1.13.0
[INFO] [stderr]    Compiling libc v0.2.69
[INFO] [stderr]    Compiling libpulse-binding v2.16.0
[INFO] [stderr]    Compiling libpulse-simple-binding v2.16.0
[INFO] [stderr]    Compiling rsynth v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(const_fn)]
[INFO] [stdout]   |            ^^^^^^^^ feature has been removed
[INFO] [stdout]   |
[INFO] [stdout]   = note: split into finer-grained feature gates
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(const_fn)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(get_mut_unchecked)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0557.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rsynth` due to 4 previous errors
[INFO] running `Command { std: "docker" "inspect" "0e1e4818fdbba6fa6ba14857b84bc7b49d9019bd053e3b47695e01017805966f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0e1e4818fdbba6fa6ba14857b84bc7b49d9019bd053e3b47695e01017805966f", kill_on_drop: false }`
[INFO] [stdout] 0e1e4818fdbba6fa6ba14857b84bc7b49d9019bd053e3b47695e01017805966f