[INFO] fetching crate lib_battleship 2.1.0...
[INFO] checking lib_battleship-2.1.0 against master#90442458ac46b1d5eed752c316da25450f67285b for pr-81477
[INFO] extracting crate lib_battleship 2.1.0 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate lib_battleship 2.1.0 on toolchain 90442458ac46b1d5eed752c316da25450f67285b
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+90442458ac46b1d5eed752c316da25450f67285b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate lib_battleship 2.1.0
[INFO] finished tweaking crates.io crate lib_battleship 2.1.0
[INFO] tweaked toml for crates.io crate lib_battleship 2.1.0 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+90442458ac46b1d5eed752c316da25450f67285b" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+90442458ac46b1d5eed752c316da25450f67285b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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:ea7d7bff36b2ba8ce4de8bba1d2dea90376bc481f1a945a913994a8c492e40c1" "/opt/rustwide/cargo-home/bin/cargo" "+90442458ac46b1d5eed752c316da25450f67285b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1b3ac234c52ea6b76c5d23d7a4b18b82f3f031ec858a801beab85c7ff0d96dd2
[INFO] running `Command { std: "docker" "start" "-a" "1b3ac234c52ea6b76c5d23d7a4b18b82f3f031ec858a801beab85c7ff0d96dd2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1b3ac234c52ea6b76c5d23d7a4b18b82f3f031ec858a801beab85c7ff0d96dd2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1b3ac234c52ea6b76c5d23d7a4b18b82f3f031ec858a801beab85c7ff0d96dd2", kill_on_drop: false }`
[INFO] [stdout] 1b3ac234c52ea6b76c5d23d7a4b18b82f3f031ec858a801beab85c7ff0d96dd2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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:ea7d7bff36b2ba8ce4de8bba1d2dea90376bc481f1a945a913994a8c492e40c1" "/opt/rustwide/cargo-home/bin/cargo" "+90442458ac46b1d5eed752c316da25450f67285b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8e2b443db5e293cd2f845c68702149dd2098b067acc279b2e2c6b74fdd02739f
[INFO] running `Command { std: "docker" "start" "-a" "8e2b443db5e293cd2f845c68702149dd2098b067acc279b2e2c6b74fdd02739f", kill_on_drop: false }`
[INFO] [stderr]     Checking lib_battleship v2.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]   --> src/battlefield/ship_status.rs:45:13
[INFO] [stdout]    |
[INFO] [stdout] 45 |             mem::replace(&mut self.status_p1[ship_type_id], curr_val - 1);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]   --> src/battlefield/ship_status.rs:49:13
[INFO] [stdout]    |
[INFO] [stdout] 49 |             mem::replace(&mut self.status_p2[ship_type_id], curr_val - 1);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]   --> src/battlefield/ship_status.rs:45:13
[INFO] [stdout]    |
[INFO] [stdout] 45 |             mem::replace(&mut self.status_p1[ship_type_id], curr_val - 1);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]   --> src/battlefield/ship_status.rs:49:13
[INFO] [stdout]    |
[INFO] [stdout] 49 |             mem::replace(&mut self.status_p2[ship_type_id], curr_val - 1);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.51s
[INFO] running `Command { std: "docker" "inspect" "8e2b443db5e293cd2f845c68702149dd2098b067acc279b2e2c6b74fdd02739f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8e2b443db5e293cd2f845c68702149dd2098b067acc279b2e2c6b74fdd02739f", kill_on_drop: false }`
[INFO] [stdout] 8e2b443db5e293cd2f845c68702149dd2098b067acc279b2e2c6b74fdd02739f