[INFO] fetching crate arc-cow 0.1.0...
[INFO] checking arc-cow-0.1.0 against try#a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d for pr-145342-1
[INFO] extracting crate arc-cow 0.1.0 into /workspace/builds/worker-2-tc2/source
[INFO] started tweaking crates.io crate arc-cow 0.1.0
[INFO] finished tweaking crates.io crate arc-cow 0.1.0
[INFO] tweaked toml for crates.io crate arc-cow 0.1.0 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate arc-cow 0.1.0 on toolchain a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate arc-cow 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2fa82b5b2a9fc926d1bb9486547d07e5791d2320b3c4dcb792e8058fa510ef33
[INFO] running `Command { std: "docker" "start" "-a" "2fa82b5b2a9fc926d1bb9486547d07e5791d2320b3c4dcb792e8058fa510ef33", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2fa82b5b2a9fc926d1bb9486547d07e5791d2320b3c4dcb792e8058fa510ef33", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2fa82b5b2a9fc926d1bb9486547d07e5791d2320b3c4dcb792e8058fa510ef33", kill_on_drop: false }`
[INFO] [stdout] 2fa82b5b2a9fc926d1bb9486547d07e5791d2320b3c4dcb792e8058fa510ef33
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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" "RUSTDOCFLAGS=--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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 245c8c6dbec3ddf91aa6853f982a38c822508f3ff7c79bde9c54504ec1f7d0bf
[INFO] running `Command { std: "docker" "start" "-a" "245c8c6dbec3ddf91aa6853f982a38c822508f3ff7c79bde9c54504ec1f7d0bf", kill_on_drop: false }`
[INFO] [stderr]     Checking arc-cow v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `arc_cow_owned`
[INFO] [stdout]    --> src/lib.rs:407:13
[INFO] [stdout]     |
[INFO] [stdout] 407 |         let arc_cow_owned = ArcCow::Owned(owned_arc);
[INFO] [stdout]     |             ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_arc_cow_owned`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `ArcCowExt` is never used
[INFO] [stdout]    --> src/lib.rs:461:11
[INFO] [stdout]     |
[INFO] [stdout] 461 |     trait ArcCowExt<T: ?Sized> {
[INFO] [stdout]     |           ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.15s
[INFO] running `Command { std: "docker" "inspect" "245c8c6dbec3ddf91aa6853f982a38c822508f3ff7c79bde9c54504ec1f7d0bf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "245c8c6dbec3ddf91aa6853f982a38c822508f3ff7c79bde9c54504ec1f7d0bf", kill_on_drop: false }`
[INFO] [stdout] 245c8c6dbec3ddf91aa6853f982a38c822508f3ff7c79bde9c54504ec1f7d0bf