[INFO] cloning repository https://github.com/agrism/learn-rust-1
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/agrism/learn-rust-1" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fagrism%2Flearn-rust-1", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fagrism%2Flearn-rust-1'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9001afb992827eba8b7c3bdcefde5dc0da26d27e
[INFO] checking agrism/learn-rust-1 against master#8007b506ac5da629f223b755f5a5391edd5f6d01 for pr-88041
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fagrism%2Flearn-rust-1" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/agrism/learn-rust-1 on toolchain 8007b506ac5da629f223b755f5a5391edd5f6d01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8007b506ac5da629f223b755f5a5391edd5f6d01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/agrism/learn-rust-1
[INFO] finished tweaking git repo https://github.com/agrism/learn-rust-1
[INFO] tweaked toml for git repo https://github.com/agrism/learn-rust-1 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/agrism/learn-rust-1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8007b506ac5da629f223b755f5a5391edd5f6d01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "+8007b506ac5da629f223b755f5a5391edd5f6d01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3d653047b91f8d4fa707ea7e53b51127115f8a408dd4777fee4467787d2b6fed
[INFO] running `Command { std: "docker" "start" "-a" "3d653047b91f8d4fa707ea7e53b51127115f8a408dd4777fee4467787d2b6fed", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3d653047b91f8d4fa707ea7e53b51127115f8a408dd4777fee4467787d2b6fed", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3d653047b91f8d4fa707ea7e53b51127115f8a408dd4777fee4467787d2b6fed", kill_on_drop: false }`
[INFO] [stdout] 3d653047b91f8d4fa707ea7e53b51127115f8a408dd4777fee4467787d2b6fed
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "+8007b506ac5da629f223b755f5a5391edd5f6d01" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 19edb7e6c3f3ec7eb7940fd47631a8f48bca206d4b22250ff9b8d885d076a73d
[INFO] running `Command { std: "docker" "start" "-a" "19edb7e6c3f3ec7eb7940fd47631a8f48bca206d4b22250ff9b8d885d076a73d", kill_on_drop: false }`
[INFO] [stderr]     Checking learn1 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/employee.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |         &self.employees.push(employee);
[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] 20 |         let _ = &self.employees.push(employee);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/employee.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |         &self.employees.push(employee);
[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] 20 |         let _ = &self.employees.push(employee);
[INFO] [stdout]    |         +++++++
[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 0.34s
[INFO] running `Command { std: "docker" "inspect" "19edb7e6c3f3ec7eb7940fd47631a8f48bca206d4b22250ff9b8d885d076a73d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "19edb7e6c3f3ec7eb7940fd47631a8f48bca206d4b22250ff9b8d885d076a73d", kill_on_drop: false }`
[INFO] [stdout] 19edb7e6c3f3ec7eb7940fd47631a8f48bca206d4b22250ff9b8d885d076a73d