[INFO] fetching crate crcp 0.3.7...
[INFO] checking crcp-0.3.7 against 1.55.0 for beta-1.56-3
[INFO] extracting crate crcp 0.3.7 into /workspace/builds/worker-81/source
[INFO] validating manifest of crates.io crate crcp 0.3.7 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate crcp 0.3.7
[INFO] finished tweaking crates.io crate crcp 0.3.7
[INFO] tweaked toml for crates.io crate crcp 0.3.7 written to /workspace/builds/worker-81/source/Cargo.toml
[INFO] crate crates.io crate crcp 0.3.7 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/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" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f87c94a2c33d9160b129759989180c6b464fd0366e305230e1e2b2924e219b46
[INFO] running `Command { std: "docker" "start" "-a" "f87c94a2c33d9160b129759989180c6b464fd0366e305230e1e2b2924e219b46", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f87c94a2c33d9160b129759989180c6b464fd0366e305230e1e2b2924e219b46", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f87c94a2c33d9160b129759989180c6b464fd0366e305230e1e2b2924e219b46", kill_on_drop: false }`
[INFO] [stdout] f87c94a2c33d9160b129759989180c6b464fd0366e305230e1e2b2924e219b46
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/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" "+1.55.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 69dc9f5a30e47e70889b8e1cd9c174b0a406466d8699dc24cdc9b27e4537b30c
[INFO] running `Command { std: "docker" "start" "-a" "69dc9f5a30e47e70889b8e1cd9c174b0a406466d8699dc24cdc9b27e4537b30c", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.81
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking crcp v0.3.7 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/distribution_map.rs:57:13
[INFO] [stdout]    |
[INFO] [stdout] 57 |             &self.weights.insert(*k, el);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/distribution_map.rs:57:13
[INFO] [stdout]    |
[INFO] [stdout] 57 |             &self.weights.insert(*k, el);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.54s
[INFO] running `Command { std: "docker" "inspect" "69dc9f5a30e47e70889b8e1cd9c174b0a406466d8699dc24cdc9b27e4537b30c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "69dc9f5a30e47e70889b8e1cd9c174b0a406466d8699dc24cdc9b27e4537b30c", kill_on_drop: false }`
[INFO] [stdout] 69dc9f5a30e47e70889b8e1cd9c174b0a406466d8699dc24cdc9b27e4537b30c
