[INFO] fetching crate coronavirus 0.1.2...
[INFO] checking coronavirus-0.1.2 against master#dfd7b8d03fb93d0e03147d28b3be6d93260fa94d for pr-87050
[INFO] extracting crate coronavirus 0.1.2 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate coronavirus 0.1.2 on toolchain dfd7b8d03fb93d0e03147d28b3be6d93260fa94d
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate coronavirus 0.1.2
[INFO] finished tweaking crates.io crate coronavirus 0.1.2
[INFO] tweaked toml for crates.io crate coronavirus 0.1.2 written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "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-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 57c6ec81bc9f5796ee46c232dd5a3245942041607f2f54ff2a59e6effefc8818
[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" "57c6ec81bc9f5796ee46c232dd5a3245942041607f2f54ff2a59e6effefc8818", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "57c6ec81bc9f5796ee46c232dd5a3245942041607f2f54ff2a59e6effefc8818", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "57c6ec81bc9f5796ee46c232dd5a3245942041607f2f54ff2a59e6effefc8818", kill_on_drop: false }`
[INFO] [stdout] 57c6ec81bc9f5796ee46c232dd5a3245942041607f2f54ff2a59e6effefc8818
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 17f3cc90656c6c5b9f0c295adb396409d14b7630fce842b7ce3e43523a7f6253
[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" "17f3cc90656c6c5b9f0c295adb396409d14b7630fce842b7ce3e43523a7f6253", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling cc v1.0.69
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling serde v1.0.126
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking regex-automata v0.1.10
[INFO] [stderr]    Compiling curl v0.4.38
[INFO] [stderr]     Checking openssl-probe v0.1.4
[INFO] [stderr]     Checking itoa v0.4.7
[INFO] [stderr]     Checking socket2 v0.4.0
[INFO] [stderr]    Compiling openssl-sys v0.9.65
[INFO] [stderr]    Compiling libz-sys v1.1.3
[INFO] [stderr]    Compiling curl-sys v0.4.44+curl-7.77.0
[INFO] [stderr]     Checking bstr v0.2.16
[INFO] [stderr]     Checking csv v1.1.6
[INFO] [stderr]     Checking coronavirus v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:13:6
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let mut vec: Arc<Mutex<Vec<u8>>> = Arc::new(Mutex::new(Vec::new()));
[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/main.rs:14:6
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let mut c_vec = vec.clone();
[INFO] [stdout]    |         ----^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:13:6
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let mut vec: Arc<Mutex<Vec<u8>>> = Arc::new(Mutex::new(Vec::new()));
[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/main.rs:14:6
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let mut c_vec = vec.clone();
[INFO] [stdout]    |         ----^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 25.42s
[INFO] running `Command { std: "docker" "inspect" "17f3cc90656c6c5b9f0c295adb396409d14b7630fce842b7ce3e43523a7f6253", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "17f3cc90656c6c5b9f0c295adb396409d14b7630fce842b7ce3e43523a7f6253", kill_on_drop: false }`
[INFO] [stdout] 17f3cc90656c6c5b9f0c295adb396409d14b7630fce842b7ce3e43523a7f6253