[INFO] cloning repository https://github.com/Kourin1996/rust_playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Kourin1996/rust_playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKourin1996%2Frust_playground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKourin1996%2Frust_playground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 45947221c7c467cb07cdb7a8190caa5472acfef4
[INFO] testing Kourin1996/rust_playground against beta-2025-09-21 for beta-1.91-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKourin1996%2Frust_playground" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Kourin1996/rust_playground
[INFO] finished tweaking git repo https://github.com/Kourin1996/rust_playground
[INFO] tweaked toml for git repo https://github.com/Kourin1996/rust_playground written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Kourin1996/rust_playground on toolchain beta-2025-09-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Kourin1996/rust_playground 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-2025-09-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded syn v2.0.61
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e38130b139604e071d1596e9dbf297da40d4230e621e8aea631d23e7686e52e4
[INFO] running `Command { std: "docker" "start" "-a" "e38130b139604e071d1596e9dbf297da40d4230e621e8aea631d23e7686e52e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e38130b139604e071d1596e9dbf297da40d4230e621e8aea631d23e7686e52e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e38130b139604e071d1596e9dbf297da40d4230e621e8aea631d23e7686e52e4", kill_on_drop: false }`
[INFO] [stdout] e38130b139604e071d1596e9dbf297da40d4230e621e8aea631d23e7686e52e4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9b0371c6a0cf003801d887863c8083c7f96ace737da99cd7257738697b688b46
[INFO] running `Command { std: "docker" "start" "-a" "9b0371c6a0cf003801d887863c8083c7f96ace737da99cd7257738697b688b46", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.154
[INFO] [stderr]    Compiling syn v2.0.61
[INFO] [stderr]    Compiling parking_lot_core v0.9.10
[INFO] [stderr]    Compiling num_cpus v1.16.0
[INFO] [stderr]    Compiling mio v0.8.11
[INFO] [stderr]    Compiling signal-hook-registry v1.4.2
[INFO] [stderr]    Compiling socket2 v0.5.7
[INFO] [stderr]    Compiling parking_lot v0.12.2
[INFO] [stderr]    Compiling tokio-macros v2.2.0
[INFO] [stderr]    Compiling thiserror-impl v1.0.61
[INFO] [stderr]    Compiling tokio v1.37.0
[INFO] [stderr]    Compiling thiserror v1.0.61
[INFO] [stderr]    Compiling rust_playground v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/bin/02_tcp_client/main.rs:42:5
[INFO] [stdout]    |
[INFO] [stdout] 40 |     process::exit(0);
[INFO] [stdout]    |     ---------------- any code following this expression is unreachable
[INFO] [stdout] 41 |
[INFO] [stdout] 42 |     Ok(())
[INFO] [stdout]    |     ^^^^^^ unreachable expression
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 12.28s
[INFO] running `Command { std: "docker" "inspect" "9b0371c6a0cf003801d887863c8083c7f96ace737da99cd7257738697b688b46", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9b0371c6a0cf003801d887863c8083c7f96ace737da99cd7257738697b688b46", kill_on_drop: false }`
[INFO] [stdout] 9b0371c6a0cf003801d887863c8083c7f96ace737da99cd7257738697b688b46
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0859c6ead9499e6ea2622e9f7db0f9fe6dfb342a1b726d7edbe8c5e66bf949d3
[INFO] running `Command { std: "docker" "start" "-a" "0859c6ead9499e6ea2622e9f7db0f9fe6dfb342a1b726d7edbe8c5e66bf949d3", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust_playground v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/bin/02_tcp_client/main.rs:42:5
[INFO] [stdout]    |
[INFO] [stdout] 40 |     process::exit(0);
[INFO] [stdout]    |     ---------------- any code following this expression is unreachable
[INFO] [stdout] 41 |
[INFO] [stdout] 42 |     Ok(())
[INFO] [stdout]    |     ^^^^^^ unreachable expression
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.99s
[INFO] running `Command { std: "docker" "inspect" "0859c6ead9499e6ea2622e9f7db0f9fe6dfb342a1b726d7edbe8c5e66bf949d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0859c6ead9499e6ea2622e9f7db0f9fe6dfb342a1b726d7edbe8c5e66bf949d3", kill_on_drop: false }`
[INFO] [stdout] 0859c6ead9499e6ea2622e9f7db0f9fe6dfb342a1b726d7edbe8c5e66bf949d3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 73911f8e24b1a0f09a3bdae78c72b2a3f4cf99d79bcf1c73d23286c1a34a557a
[INFO] running `Command { std: "docker" "start" "-a" "73911f8e24b1a0f09a3bdae78c72b2a3f4cf99d79bcf1c73d23286c1a34a557a", kill_on_drop: false }`
[INFO] [stderr] warning: unreachable expression
[INFO] [stdout] 
[INFO] [stderr]   --> src/bin/02_tcp_client/main.rs:42:5
[INFO] [stdout] running 0 tests
[INFO] [stderr]    |
[INFO] [stdout] 
[INFO] [stderr] 40 |     process::exit(0);
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr]    |     ---------------- any code following this expression is unreachable
[INFO] [stdout] 
[INFO] [stderr] 41 |
[INFO] [stdout] 
[INFO] [stderr] 42 |     Ok(())
[INFO] [stdout] running 0 tests
[INFO] [stderr]    |     ^^^^^^ unreachable expression
[INFO] [stdout] 
[INFO] [stderr]    |
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr]    = note: `#[warn(unreachable_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stderr] warning: `rust_playground` (bin "02" test) generated 1 warning
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.08s
[INFO] [stderr]      Running unittests src/bin/01_tcp_server/main.rs (/opt/rustwide/target/debug/deps/01-4ee9748dd77db722)
[INFO] [stderr]      Running unittests src/bin/02_tcp_client/main.rs (/opt/rustwide/target/debug/deps/02-5ab8de4aef63837f)
[INFO] [stderr]      Running unittests src/bin/03_simple_future/main.rs (/opt/rustwide/target/debug/deps/03-4d278cca31b69133)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/bin/04_thread_example/main.rs (/opt/rustwide/target/debug/deps/04-11759045c04a738e)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/bin/05_cell_example/main.rs (/opt/rustwide/target/debug/deps/05-86726283e2897763)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/bin/06_mutex_example/main.rs (/opt/rustwide/target/debug/deps/06-b0a3541070e600d4)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/bin/07_atomic_exampmle/main.rs (/opt/rustwide/target/debug/deps/07-07e38f1b03a92243)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "73911f8e24b1a0f09a3bdae78c72b2a3f4cf99d79bcf1c73d23286c1a34a557a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "73911f8e24b1a0f09a3bdae78c72b2a3f4cf99d79bcf1c73d23286c1a34a557a", kill_on_drop: false }`
[INFO] [stdout] 73911f8e24b1a0f09a3bdae78c72b2a3f4cf99d79bcf1c73d23286c1a34a557a