[INFO] cloning repository https://github.com/CheatCod/learning-session
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/CheatCod/learning-session" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCheatCod%2Flearning-session", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCheatCod%2Flearning-session'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6785650df03fc07d39fae2d2577d995ba34633fb
[INFO] testing CheatCod/learning-session against beta-2026-01-20 for beta-1.94-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCheatCod%2Flearning-session" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/CheatCod/learning-session
[INFO] finished tweaking git repo https://github.com/CheatCod/learning-session
[INFO] tweaked toml for git repo https://github.com/CheatCod/learning-session written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/CheatCod/learning-session on toolchain beta-2026-01-20
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-01-20" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/CheatCod/learning-session 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" "+beta-2026-01-20" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:98afbf2d16093dec2546ff8915fddc74e65664aa03fc460b3712b1c2c54a33e4" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-01-20" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 49f2715bd031608c43f90fb9ec8dd33db4b27a651a2b4c30fcd7dfbd098b9c71
[INFO] running `Command { std: "docker" "start" "-a" "49f2715bd031608c43f90fb9ec8dd33db4b27a651a2b4c30fcd7dfbd098b9c71", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "49f2715bd031608c43f90fb9ec8dd33db4b27a651a2b4c30fcd7dfbd098b9c71", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "49f2715bd031608c43f90fb9ec8dd33db4b27a651a2b4c30fcd7dfbd098b9c71", kill_on_drop: false }`
[INFO] [stdout] 49f2715bd031608c43f90fb9ec8dd33db4b27a651a2b4c30fcd7dfbd098b9c71
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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=warn" "-e" "RUSTDOCFLAGS=--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@sha256:98afbf2d16093dec2546ff8915fddc74e65664aa03fc460b3712b1c2c54a33e4" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-01-20" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e813d6640813bdf383aef1eb688e41288c8394ed85c4a488360daab12babf5bd
[INFO] running `Command { std: "docker" "start" "-a" "e813d6640813bdf383aef1eb688e41288c8394ed85c4a488360daab12babf5bd", kill_on_drop: false }`
[INFO] [stderr]    Compiling bytes v1.8.0
[INFO] [stderr]    Compiling socket2 v0.5.7
[INFO] [stderr]    Compiling signal-hook-registry v1.4.2
[INFO] [stderr]    Compiling mio v1.0.2
[INFO] [stderr]    Compiling parking_lot_core v0.9.10
[INFO] [stderr]    Compiling syn v2.0.85
[INFO] [stderr]    Compiling parking_lot v0.12.3
[INFO] [stderr]    Compiling tokio-macros v2.4.0
[INFO] [stderr]    Compiling tokio v1.41.0
[INFO] [stderr]    Compiling learning-session v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 11.84s
[INFO] running `Command { std: "docker" "inspect" "e813d6640813bdf383aef1eb688e41288c8394ed85c4a488360daab12babf5bd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e813d6640813bdf383aef1eb688e41288c8394ed85c4a488360daab12babf5bd", kill_on_drop: false }`
[INFO] [stdout] e813d6640813bdf383aef1eb688e41288c8394ed85c4a488360daab12babf5bd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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=warn" "-e" "RUSTDOCFLAGS=--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@sha256:98afbf2d16093dec2546ff8915fddc74e65664aa03fc460b3712b1c2c54a33e4" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-01-20" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 40eea34cd36b9e9eec478682fe54aba7d16584767e34da87cc1500d4e61028fe
[INFO] running `Command { std: "docker" "start" "-a" "40eea34cd36b9e9eec478682fe54aba7d16584767e34da87cc1500d4e61028fe", kill_on_drop: false }`
[INFO] [stderr]    Compiling learning-session v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/intro_to_multi_threading/lesson.rs:150:13
[INFO] [stdout]     |
[INFO] [stdout] 150 |         let mut counter = Arc::new(Mutex::new(0));
[INFO] [stdout]     |             ----^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused implementer of `Future` that must be used
[INFO] [stdout]    --> src/intro_to_async/lesson.rs:121:9
[INFO] [stdout]     |
[INFO] [stdout] 121 |         async_fn(0);
[INFO] [stdout]     |         ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: futures do nothing unless you `.await` or poll them
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 1.18s
[INFO] running `Command { std: "docker" "inspect" "40eea34cd36b9e9eec478682fe54aba7d16584767e34da87cc1500d4e61028fe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "40eea34cd36b9e9eec478682fe54aba7d16584767e34da87cc1500d4e61028fe", kill_on_drop: false }`
[INFO] [stdout] 40eea34cd36b9e9eec478682fe54aba7d16584767e34da87cc1500d4e61028fe
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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=warn" "-e" "RUSTDOCFLAGS=--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@sha256:98afbf2d16093dec2546ff8915fddc74e65664aa03fc460b3712b1c2c54a33e4" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-01-20" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 00348a01fc81081565f25e77ec84d302b7551e113df29e86934fc6410d1c2b96
[INFO] running `Command { std: "docker" "start" "-a" "00348a01fc81081565f25e77ec84d302b7551e113df29e86934fc6410d1c2b96", kill_on_drop: false }`
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/intro_to_multi_threading/lesson.rs:150:13
[INFO] [stderr]     |
[INFO] [stderr] 150 |         let mut counter = Arc::new(Mutex::new(0));
[INFO] [stderr]     |             ----^^^^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused implementer of `Future` that must be used
[INFO] [stderr]    --> src/intro_to_async/lesson.rs:121:9
[INFO] [stderr]     |
[INFO] [stderr] 121 |         async_fn(0);
[INFO] [stderr]     |         ^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: futures do nothing unless you `.await` or poll them
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `learning-session` (bin "learning-session" test) generated 2 warnings (run `cargo fix --bin "learning-session" -p learning-session --tests` to apply 1 suggestion)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.08s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/learning_session-4dd938bb2b178de1)
[INFO] [stdout] 
[INFO] [stdout] running 20 tests
[INFO] [stdout] test intro_to_async::lesson::async_rust::futures ... ok
[INFO] [stdout] test intro_to_async::lesson::async_rust::quiz ... ok
[INFO] [stdout] test intro_to_multi_threading::lesson::move_semantics::main ... ok
[INFO] [stdout] test intro_to_multi_threading::lesson::sharing_data::sharing_data_attempt_2 ... ok
[INFO] [stdout] test intro_to_multi_threading::lesson::sharing_data::sharing_data_attempt_3 ... ok
[INFO] [stdout] test intro_to_multi_threading::lesson::sharing_data::sharing_data_attempt_1 ... ok
[INFO] [stdout] test intro_to_async::lesson::sync_and_send_trait::send_trait ... ok
[INFO] [stdout] test intro_to_multi_threading::lesson::sharing_data::sharing_data_5_do_not_do_this ... ok
[INFO] [stdout] test intro_to_multi_threading::lesson::sharing_data::sharing_data_attempt_4 ... ok
[INFO] [stdout] test intro_to_multi_threading::lesson::sharing_data::sharing_data_with_arc_and_mutex ... ok
[INFO] [stdout] test intro_to_async::lesson::sync_and_send_trait::composite_types ... ok
[INFO] [stdout] test intro_to_async::lesson::sync_and_send_trait::unsafe_impl ... ok
[INFO] [stdout] test intro_to_async::lesson::sync_and_send_trait::sync_trait ... ok
[INFO] [stdout] test intro_to_async::lesson::async_rust::select ... ok
[INFO] [stdout] test intro_to_multi_threading::lesson::basic_thread::main ... ok
[INFO] [stdout] test intro_to_async::lesson::async_rust::join ... ok
[INFO] [stdout] test intro_to_async::lesson::async_rust::do_not_block_the_runtime ... ok
[INFO] [stdout] test intro_to_async::lesson::async_rust::running_blocking_code has been running for over 60 seconds
[INFO] [stdout] test intro_to_async::lesson::async_rust::runtime_is_smart has been running for over 60 seconds
[INFO] [stdout] test intro_to_async::lesson::async_rust::spawning has been running for over 60 seconds
[INFO] [stdout] test intro_to_async::lesson::async_rust::runtime_is_smart ... ok
[INFO] [stdout] test intro_to_async::lesson::async_rust::running_blocking_code ... ok
[ERROR] error running command: no output for 300 seconds
[INFO] running `Command { std: "docker" "inspect" "00348a01fc81081565f25e77ec84d302b7551e113df29e86934fc6410d1c2b96", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "00348a01fc81081565f25e77ec84d302b7551e113df29e86934fc6410d1c2b96", kill_on_drop: false }`
[INFO] [stdout] 00348a01fc81081565f25e77ec84d302b7551e113df29e86934fc6410d1c2b96
