[INFO] fetching crate numb_rs 0.0.3...
[INFO] checking numb_rs-0.0.3 against master#0599f3403366d9c57f0625e6de3af214b5042a90 for pr-87710
[INFO] extracting crate numb_rs 0.0.3 into /workspace/builds/worker-96/source
[INFO] validating manifest of crates.io crate numb_rs 0.0.3 on toolchain 0599f3403366d9c57f0625e6de3af214b5042a90
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0599f3403366d9c57f0625e6de3af214b5042a90" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate numb_rs 0.0.3
[INFO] finished tweaking crates.io crate numb_rs 0.0.3
[INFO] tweaked toml for crates.io crate numb_rs 0.0.3 written to /workspace/builds/worker-96/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0599f3403366d9c57f0625e6de3af214b5042a90" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0599f3403366d9c57f0625e6de3af214b5042a90" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-96/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-96/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" "+0599f3403366d9c57f0625e6de3af214b5042a90" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 92cc7f7b18acf6966a359cf5fda74d7ca8ce7574d3554439bac6705e79be2996
[INFO] running `Command { std: "docker" "start" "-a" "92cc7f7b18acf6966a359cf5fda74d7ca8ce7574d3554439bac6705e79be2996", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "92cc7f7b18acf6966a359cf5fda74d7ca8ce7574d3554439bac6705e79be2996", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "92cc7f7b18acf6966a359cf5fda74d7ca8ce7574d3554439bac6705e79be2996", kill_on_drop: false }`
[INFO] [stdout] 92cc7f7b18acf6966a359cf5fda74d7ca8ce7574d3554439bac6705e79be2996
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-96/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-96/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" "+0599f3403366d9c57f0625e6de3af214b5042a90" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 09990a4efacf25133f04abe1d93591fea26df8f4c255fa53f493c3342ae08b31
[INFO] running `Command { std: "docker" "start" "-a" "09990a4efacf25133f04abe1d93591fea26df8f4c255fa53f493c3342ae08b31", kill_on_drop: false }`
[INFO] [stderr]     Checking numb_rs v0.0.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]     --> src/lib.rs:1089:9
[INFO] [stdout]      |
[INFO] [stdout] 1089 |         &a.assert_approx_eq(&b, 0.00005);
[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] 1089 |         let _ = &a.assert_approx_eq(&b, 0.00005);
[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 2.17s
[INFO] running `Command { std: "docker" "inspect" "09990a4efacf25133f04abe1d93591fea26df8f4c255fa53f493c3342ae08b31", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "09990a4efacf25133f04abe1d93591fea26df8f4c255fa53f493c3342ae08b31", kill_on_drop: false }`
[INFO] [stdout] 09990a4efacf25133f04abe1d93591fea26df8f4c255fa53f493c3342ae08b31