[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] checking JoshuaPostel/rust-book-hello against try#81275a1445c7502a974118e0c69b795ab60be991 for pr-80243
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJoshuaPostel%2Frust-book-hello" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/JoshuaPostel/rust-book-hello on toolchain 81275a1445c7502a974118e0c69b795ab60be991
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+81275a1445c7502a974118e0c69b795ab60be991" "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-6/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" "+81275a1445c7502a974118e0c69b795ab60be991" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+81275a1445c7502a974118e0c69b795ab60be991" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f7d232db8f4ae6a08644493109e4fadd48c1774d159df1aa56811c3f7eb89193
[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" "f7d232db8f4ae6a08644493109e4fadd48c1774d159df1aa56811c3f7eb89193", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f7d232db8f4ae6a08644493109e4fadd48c1774d159df1aa56811c3f7eb89193", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f7d232db8f4ae6a08644493109e4fadd48c1774d159df1aa56811c3f7eb89193", kill_on_drop: false }`
[INFO] [stdout] f7d232db8f4ae6a08644493109e4fadd48c1774d159df1aa56811c3f7eb89193
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+81275a1445c7502a974118e0c69b795ab60be991" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e6b6209ffdf0edc846f2e8c52a5bc8edea2318eabb3b8c1ceb81e572ff8dbde8
[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" "e6b6209ffdf0edc846f2e8c52a5bc8edea2318eabb3b8c1ceb81e572ff8dbde8", kill_on_drop: false }`
[INFO] [stderr]     Checking hello v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0599]: no method named `join` found for enum `Option<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 `Option<JoinHandle<()>>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `join` found for enum `Option<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 `Option<JoinHandle<()>>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[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] [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] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "e6b6209ffdf0edc846f2e8c52a5bc8edea2318eabb3b8c1ceb81e572ff8dbde8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e6b6209ffdf0edc846f2e8c52a5bc8edea2318eabb3b8c1ceb81e572ff8dbde8", kill_on_drop: false }`
[INFO] [stdout] e6b6209ffdf0edc846f2e8c52a5bc8edea2318eabb3b8c1ceb81e572ff8dbde8