[INFO] fetching crate close-file 0.1.0...
[INFO] checking close-file-0.1.0 against beta-2021-10-15 for beta-1.56-3
[INFO] extracting crate close-file 0.1.0 into /workspace/builds/worker-69/source
[INFO] validating manifest of crates.io crate close-file 0.1.0 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 close-file 0.1.0
[INFO] finished tweaking crates.io crate close-file 0.1.0
[INFO] tweaked toml for crates.io crate close-file 0.1.0 written to /workspace/builds/worker-69/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-10-15" "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" "+beta-2021-10-15" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-69/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-69/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] c57a8b45481c371d0fc18dc7ee83c3ebedba2301fbda1f549a522f59b6ee2fc5
[INFO] running `Command { std: "docker" "start" "-a" "c57a8b45481c371d0fc18dc7ee83c3ebedba2301fbda1f549a522f59b6ee2fc5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c57a8b45481c371d0fc18dc7ee83c3ebedba2301fbda1f549a522f59b6ee2fc5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c57a8b45481c371d0fc18dc7ee83c3ebedba2301fbda1f549a522f59b6ee2fc5", kill_on_drop: false }`
[INFO] [stdout] c57a8b45481c371d0fc18dc7ee83c3ebedba2301fbda1f549a522f59b6ee2fc5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-69/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-69/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] 19b5793922fdb4f10f433c869880cf85a3a0142e8348bbd4c22ee5b1e12765e2
[INFO] running `Command { std: "docker" "start" "-a" "19b5793922fdb4f10f433c869880cf85a3a0142e8348bbd4c22ee5b1e12765e2", kill_on_drop: false }`
[INFO] [stderr]     Checking close-file v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> tests/close.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     f.write_all("Hello, world!".as_bytes());
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> tests/close.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     f.close();
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.52s
[INFO] running `Command { std: "docker" "inspect" "19b5793922fdb4f10f433c869880cf85a3a0142e8348bbd4c22ee5b1e12765e2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "19b5793922fdb4f10f433c869880cf85a3a0142e8348bbd4c22ee5b1e12765e2", kill_on_drop: false }`
[INFO] [stdout] 19b5793922fdb4f10f433c869880cf85a3a0142e8348bbd4c22ee5b1e12765e2
