[INFO] cloning repository https://github.com/JoshuaPostel/rust-book-hello
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/JoshuaPostel/rust-book-hello" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJoshuaPostel%2Frust-book-hello", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJoshuaPostel%2Frust-book-hello'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7da319d05625958f4a890346362d7db0540ebbaf
[INFO] testing JoshuaPostel/rust-book-hello against 1.45.2 for beta-1.46-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJoshuaPostel%2Frust-book-hello" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/JoshuaPostel/rust-book-hello on toolchain 1.45.2
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.45.2" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/JoshuaPostel/rust-book-hello
[INFO] finished tweaking git repo https://github.com/JoshuaPostel/rust-book-hello
[INFO] tweaked toml for git repo https://github.com/JoshuaPostel/rust-book-hello written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/JoshuaPostel/rust-book-hello already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.45.2" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 45274d20d2538c92e7886bb3e35104fcb3a1c0bdbe4f479e2be8dfd4581a16f3
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "45274d20d2538c92e7886bb3e35104fcb3a1c0bdbe4f479e2be8dfd4581a16f3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "45274d20d2538c92e7886bb3e35104fcb3a1c0bdbe4f479e2be8dfd4581a16f3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "45274d20d2538c92e7886bb3e35104fcb3a1c0bdbe4f479e2be8dfd4581a16f3", kill_on_drop: false }`
[INFO] [stdout] 45274d20d2538c92e7886bb3e35104fcb3a1c0bdbe4f479e2be8dfd4581a16f3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f2ce05ed6960a976c94e19de8c1ef3a4a69972efaaf9491a47150cbcde182b37
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "f2ce05ed6960a976c94e19de8c1ef3a4a69972efaaf9491a47150cbcde182b37", kill_on_drop: false }`
[INFO] [stderr]    Compiling hello v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0599]: no method named `join` found for enum `std::option::Option<std::thread::JoinHandle<()>>` in the current scope
[INFO] [stdout]   --> src/lib.rs:60:27
[INFO] [stdout]    |
[INFO] [stdout] 60 |             worker.thread.join().unwrap();
[INFO] [stdout]    |                           ^^^^ method not found in `std::option::Option<std::thread::JoinHandle<()>>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `hello`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "f2ce05ed6960a976c94e19de8c1ef3a4a69972efaaf9491a47150cbcde182b37", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f2ce05ed6960a976c94e19de8c1ef3a4a69972efaaf9491a47150cbcde182b37", kill_on_drop: false }`
[INFO] [stdout] f2ce05ed6960a976c94e19de8c1ef3a4a69972efaaf9491a47150cbcde182b37