[INFO] cloning repository https://github.com/khetzl/kswim
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/khetzl/kswim" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkhetzl%2Fkswim", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkhetzl%2Fkswim'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8168ec724c9fd88c5dd651bb9608cd30c5b415c1
[INFO] testing khetzl/kswim against 1.60.0 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkhetzl%2Fkswim" "/workspace/builds/worker-42/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-42/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/khetzl/kswim 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/khetzl/kswim
[INFO] finished tweaking git repo https://github.com/khetzl/kswim
[INFO] tweaked toml for git repo https://github.com/khetzl/kswim written to /workspace/builds/worker-42/source/Cargo.toml
[INFO] crate git repo https://github.com/khetzl/kswim 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-42/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-42/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" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e876a7e90564e3a1219ea805cf3431f19fd41a331fee7dd22f9b2e8b72a7ca71
[INFO] running `Command { std: "docker" "start" "-a" "e876a7e90564e3a1219ea805cf3431f19fd41a331fee7dd22f9b2e8b72a7ca71", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e876a7e90564e3a1219ea805cf3431f19fd41a331fee7dd22f9b2e8b72a7ca71", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e876a7e90564e3a1219ea805cf3431f19fd41a331fee7dd22f9b2e8b72a7ca71", kill_on_drop: false }`
[INFO] [stdout] e876a7e90564e3a1219ea805cf3431f19fd41a331fee7dd22f9b2e8b72a7ca71
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-42/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-42/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" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d95aad64d17ca00b0fcf0332894d71f8640eb774aaed7002361029e70171cb12
[INFO] running `Command { std: "docker" "start" "-a" "d95aad64d17ca00b0fcf0332894d71f8640eb774aaed7002361029e70171cb12", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.98
[INFO] [stderr]    Compiling syn v1.0.74
[INFO] [stderr]    Compiling smallvec v1.6.1
[INFO] [stderr]    Compiling memchr v2.4.0
[INFO] [stderr]    Compiling ppv-lite86 v0.2.10
[INFO] [stderr]    Compiling bytes v1.0.1
[INFO] [stderr]    Compiling instant v0.1.10
[INFO] [stderr]    Compiling lock_api v0.4.4
[INFO] [stderr]    Compiling tokio v1.9.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.27
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling getrandom v0.2.3
[INFO] [stderr]    Compiling parking_lot_core v0.8.3
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling signal-hook-registry v1.4.0
[INFO] [stderr]    Compiling mio v0.7.13
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling parking_lot v0.11.1
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.4
[INFO] [stderr]    Compiling tokio-macros v1.3.0
[INFO] [stderr]    Compiling kswim v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/dissemination_tcp.rs:37:28
[INFO] [stdout]    |
[INFO] [stdout] 37 |         let (send_channel, mut rx) = mpsc::channel(32);
[INFO] [stdout]    |                            ----^^
[INFO] [stdout]    |                            |
[INFO] [stdout]    |                            help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/dissemination_tcp.rs:125:24
[INFO] [stdout]     |
[INFO] [stdout] 125 | async fn handle_socket(mut stream: TcpStream) {
[INFO] [stdout]     |                        ----^^^^^^
[INFO] [stdout]     |                        |
[INFO] [stdout]     |                        help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(get_mut_unchecked)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `kswim` due to 2 previous errors; 2 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "d95aad64d17ca00b0fcf0332894d71f8640eb774aaed7002361029e70171cb12", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d95aad64d17ca00b0fcf0332894d71f8640eb774aaed7002361029e70171cb12", kill_on_drop: false }`
[INFO] [stdout] d95aad64d17ca00b0fcf0332894d71f8640eb774aaed7002361029e70171cb12