[INFO] fetching crate unsafe_unwrap 0.1.0...
[INFO] testing unsafe_unwrap-0.1.0 against beta-2022-04-10 for beta-1.61-1
[INFO] extracting crate unsafe_unwrap 0.1.0 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate unsafe_unwrap 0.1.0 on toolchain beta-2022-04-10
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate unsafe_unwrap 0.1.0
[INFO] finished tweaking crates.io crate unsafe_unwrap 0.1.0
[INFO] tweaked toml for crates.io crate unsafe_unwrap 0.1.0 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 506afb71f821f9acbdd889ad78dd1fc369458ddbb8acb6c567a849a64d158f12
[INFO] running `Command { std: "docker" "start" "-a" "506afb71f821f9acbdd889ad78dd1fc369458ddbb8acb6c567a849a64d158f12", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "506afb71f821f9acbdd889ad78dd1fc369458ddbb8acb6c567a849a64d158f12", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "506afb71f821f9acbdd889ad78dd1fc369458ddbb8acb6c567a849a64d158f12", kill_on_drop: false }`
[INFO] [stdout] 506afb71f821f9acbdd889ad78dd1fc369458ddbb8acb6c567a849a64d158f12
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ac6c35015e364d6d1ca09f0d781ab754ada334d44ff1446dbda74a9fef973fbc
[INFO] running `Command { std: "docker" "start" "-a" "ac6c35015e364d6d1ca09f0d781ab754ada334d44ff1446dbda74a9fef973fbc", kill_on_drop: false }`
[INFO] [stderr]    Compiling unsafe_unwrap v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/lib.rs:47:9
[INFO] [stdout]    |
[INFO] [stdout] 47 |         match transmute::<_, Impossible>(ZeroSized) {}
[INFO] [stdout]    |         ^^^^^^-------------------------------------^^^
[INFO] [stdout]    |         |     |
[INFO] [stdout]    |         |     any code following this expression is unreachable
[INFO] [stdout]    |         unreachable expression
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] note: this expression has type `Impossible`, which is uninhabited
[INFO] [stdout]   --> src/lib.rs:47:15
[INFO] [stdout]    |
[INFO] [stdout] 47 |         match transmute::<_, Impossible>(ZeroSized) {}
[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 0.64s
[INFO] running `Command { std: "docker" "inspect" "ac6c35015e364d6d1ca09f0d781ab754ada334d44ff1446dbda74a9fef973fbc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ac6c35015e364d6d1ca09f0d781ab754ada334d44ff1446dbda74a9fef973fbc", kill_on_drop: false }`
[INFO] [stdout] ac6c35015e364d6d1ca09f0d781ab754ada334d44ff1446dbda74a9fef973fbc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b9e30e916fd2414fbd19bd95240cddc728c9d461c7ae9e8977f758a46c7da56a
[INFO] running `Command { std: "docker" "start" "-a" "b9e30e916fd2414fbd19bd95240cddc728c9d461c7ae9e8977f758a46c7da56a", kill_on_drop: false }`
[INFO] [stderr]    Compiling unsafe_unwrap v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/lib.rs:47:9
[INFO] [stdout]    |
[INFO] [stdout] 47 |         match transmute::<_, Impossible>(ZeroSized) {}
[INFO] [stdout]    |         ^^^^^^-------------------------------------^^^
[INFO] [stdout]    |         |     |
[INFO] [stdout]    |         |     any code following this expression is unreachable
[INFO] [stdout]    |         unreachable expression
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] note: this expression has type `Impossible`, which is uninhabited
[INFO] [stdout]   --> src/lib.rs:47:15
[INFO] [stdout]    |
[INFO] [stdout] 47 |         match transmute::<_, Impossible>(ZeroSized) {}
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:23:27
[INFO] [stdout]    |
[INFO] [stdout] 23 | #![cfg_attr(test, feature(test))]
[INFO] [stdout]    |                           ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `unsafe_unwrap` due to 2 previous errors
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "b9e30e916fd2414fbd19bd95240cddc728c9d461c7ae9e8977f758a46c7da56a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b9e30e916fd2414fbd19bd95240cddc728c9d461c7ae9e8977f758a46c7da56a", kill_on_drop: false }`
[INFO] [stdout] b9e30e916fd2414fbd19bd95240cddc728c9d461c7ae9e8977f758a46c7da56a