[INFO] fetching crate crcp 0.3.7...
[INFO] checking crcp-0.3.7 against beta-2021-10-15 for beta-1.56-3
[INFO] extracting crate crcp 0.3.7 into /workspace/builds/worker-62/source
[INFO] validating manifest of crates.io crate crcp 0.3.7 on toolchain beta-2021-10-15
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-10-15" "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-62/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" "+beta-2021-10-15" "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-62/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-62/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-2021-10-15" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ac1c187c999a5f21a60319ffe86d8de5aa1ef41e47877a2920dcae1a963e7959
[INFO] running `Command { std: "docker" "start" "-a" "ac1c187c999a5f21a60319ffe86d8de5aa1ef41e47877a2920dcae1a963e7959", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ac1c187c999a5f21a60319ffe86d8de5aa1ef41e47877a2920dcae1a963e7959", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ac1c187c999a5f21a60319ffe86d8de5aa1ef41e47877a2920dcae1a963e7959", kill_on_drop: false }`
[INFO] [stdout] ac1c187c999a5f21a60319ffe86d8de5aa1ef41e47877a2920dcae1a963e7959
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-62/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-62/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-2021-10-15" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0c084248056b01470f2ffad87499924c311f1a69d3181678e528163844f3fcba
[INFO] running `Command { std: "docker" "start" "-a" "0c084248056b01470f2ffad87499924c311f1a69d3181678e528163844f3fcba", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.81
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking rand v0.6.5
[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]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 57 |             let _ = &self.weights.insert(*k, el);
[INFO] [stdout]    |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[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]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 57 |             let _ = &self.weights.insert(*k, el);
[INFO] [stdout]    |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.92s
[INFO] running `Command { std: "docker" "inspect" "0c084248056b01470f2ffad87499924c311f1a69d3181678e528163844f3fcba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0c084248056b01470f2ffad87499924c311f1a69d3181678e528163844f3fcba", kill_on_drop: false }`
[INFO] [stdout] 0c084248056b01470f2ffad87499924c311f1a69d3181678e528163844f3fcba
