[INFO] cloning repository https://github.com/luxn/flut
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/luxn/flut" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fluxn%2Fflut", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fluxn%2Fflut'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 294d41a24ebe241bb75413f01d8c939f87aff1e0
[INFO] checking luxn/flut against try#b0d0ea232bdae12fa8da8491a91ae1db029990ef for pr-84037
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fluxn%2Fflut" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/luxn/flut on toolchain b0d0ea232bdae12fa8da8491a91ae1db029990ef
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b0d0ea232bdae12fa8da8491a91ae1db029990ef" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/luxn/flut
[INFO] finished tweaking git repo https://github.com/luxn/flut
[INFO] tweaked toml for git repo https://github.com/luxn/flut written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/luxn/flut already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b0d0ea232bdae12fa8da8491a91ae1db029990ef" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+b0d0ea232bdae12fa8da8491a91ae1db029990ef" "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] e2d626efb4e71d19a0026d21d80b2c5f00905aaa0e2ae9341f40fad7e7aee912
[INFO] running `Command { std: "docker" "start" "-a" "e2d626efb4e71d19a0026d21d80b2c5f00905aaa0e2ae9341f40fad7e7aee912", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e2d626efb4e71d19a0026d21d80b2c5f00905aaa0e2ae9341f40fad7e7aee912", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e2d626efb4e71d19a0026d21d80b2c5f00905aaa0e2ae9341f40fad7e7aee912", kill_on_drop: false }`
[INFO] [stdout] e2d626efb4e71d19a0026d21d80b2c5f00905aaa0e2ae9341f40fad7e7aee912
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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=forbid" "-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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+b0d0ea232bdae12fa8da8491a91ae1db029990ef" "check" "--frozen" "--all" "--all-targets" "--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] 0bc0116d35a68b368f7bee252be3e7f9ed90ae835887bc6a3617ba4f16000ce3
[INFO] running `Command { std: "docker" "start" "-a" "0bc0116d35a68b368f7bee252be3e7f9ed90ae835887bc6a3617ba4f16000ce3", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.80
[INFO] [stderr]    Compiling proc-macro2 v0.4.24
[INFO] [stderr]    Compiling ryu v0.2.7
[INFO] [stderr]    Compiling num-integer v0.1.39
[INFO] [stderr]     Checking libc v0.2.43
[INFO] [stderr]     Checking linked-hash-map v0.5.1
[INFO] [stderr]     Checking half v1.3.0
[INFO] [stderr]     Checking itoa v0.4.3
[INFO] [stderr]     Checking byteorder v1.2.7
[INFO] [stderr]     Checking yaml-rust v0.4.2
[INFO] [stderr]     Checking time v0.1.40
[INFO] [stderr]    Compiling quote v0.6.10
[INFO] [stderr]    Compiling syn v0.15.21
[INFO] [stderr]     Checking serde_json v1.0.33
[INFO] [stderr]     Checking serde_cbor v0.9.0
[INFO] [stderr]     Checking chrono v0.4.6
[INFO] [stderr]     Checking serde_yaml v0.8.7
[INFO] [stderr]    Compiling serde_derive v1.0.80
[INFO] [stderr]     Checking flut v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:89:17
[INFO] [stdout]    |
[INFO] [stdout] 89 |             let mut socket = UdpSocket::bind(format!("127.0.0.1:{}", port)).expect("udp socket could not get created");
[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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:89:17
[INFO] [stdout]    |
[INFO] [stdout] 89 |             let mut socket = UdpSocket::bind(format!("127.0.0.1:{}", port)).expect("udp socket could not get created");
[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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 28.72s
[INFO] running `Command { std: "docker" "inspect" "0bc0116d35a68b368f7bee252be3e7f9ed90ae835887bc6a3617ba4f16000ce3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0bc0116d35a68b368f7bee252be3e7f9ed90ae835887bc6a3617ba4f16000ce3", kill_on_drop: false }`
[INFO] [stdout] 0bc0116d35a68b368f7bee252be3e7f9ed90ae835887bc6a3617ba4f16000ce3