[INFO] cloning repository https://github.com/ddprrt/multi-threading-example
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ddprrt/multi-threading-example" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fddprrt%2Fmulti-threading-example", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fddprrt%2Fmulti-threading-example'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 40259cd6edf62321490be529aec4b51ff7943edb
[INFO] testing ddprrt/multi-threading-example against beta-2022-04-10 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fddprrt%2Fmulti-threading-example" "/workspace/builds/worker-20/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-20/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ddprrt/multi-threading-example 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 git repo https://github.com/ddprrt/multi-threading-example
[INFO] finished tweaking git repo https://github.com/ddprrt/multi-threading-example
[INFO] tweaked toml for git repo https://github.com/ddprrt/multi-threading-example written to /workspace/builds/worker-20/source/Cargo.toml
[INFO] crate git repo https://github.com/ddprrt/multi-threading-example already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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] 76404fb9431412ebb363dcbc7de00fa027c48b77e999549a36f5d3486c9389b6
[INFO] running `Command { std: "docker" "start" "-a" "76404fb9431412ebb363dcbc7de00fa027c48b77e999549a36f5d3486c9389b6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "76404fb9431412ebb363dcbc7de00fa027c48b77e999549a36f5d3486c9389b6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "76404fb9431412ebb363dcbc7de00fa027c48b77e999549a36f5d3486c9389b6", kill_on_drop: false }`
[INFO] [stdout] 76404fb9431412ebb363dcbc7de00fa027c48b77e999549a36f5d3486c9389b6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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] a591e8979ba3a554d73b68d75db69b4d9aa1c0c0e8439d7e0aa77d7897505bdc
[INFO] running `Command { std: "docker" "start" "-a" "a591e8979ba3a554d73b68d75db69b4d9aa1c0c0e8439d7e0aa77d7897505bdc", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.112
[INFO] [stderr]    Compiling ppv-lite86 v0.2.15
[INFO] [stderr]    Compiling getrandom v0.2.3
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.4
[INFO] [stderr]    Compiling multi-threading v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `res`
[INFO] [stdout]   --> src/main.rs:42:17
[INFO] [stdout]    |
[INFO] [stdout] 42 |             let res = match mutex.lock() {
[INFO] [stdout]    |                 ^^^ help: if this is intentional, prefix it with an underscore: `_res`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]   --> src/main.rs:36:9
[INFO] [stdout]    |
[INFO] [stdout] 36 |     let z = Rc::new(2);
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.83s
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "a591e8979ba3a554d73b68d75db69b4d9aa1c0c0e8439d7e0aa77d7897505bdc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a591e8979ba3a554d73b68d75db69b4d9aa1c0c0e8439d7e0aa77d7897505bdc", kill_on_drop: false }`
[INFO] [stdout] a591e8979ba3a554d73b68d75db69b4d9aa1c0c0e8439d7e0aa77d7897505bdc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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] 4d53b83621b790b17bf8ef883f724888e7db91c733096944391c3d46a92c1790
[INFO] running `Command { std: "docker" "start" "-a" "4d53b83621b790b17bf8ef883f724888e7db91c733096944391c3d46a92c1790", kill_on_drop: false }`
[INFO] [stderr]    Compiling multi-threading v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `res`
[INFO] [stdout]   --> src/main.rs:42:17
[INFO] [stdout]    |
[INFO] [stdout] 42 |             let res = match mutex.lock() {
[INFO] [stdout]    |                 ^^^ help: if this is intentional, prefix it with an underscore: `_res`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]   --> src/main.rs:36:9
[INFO] [stdout]    |
[INFO] [stdout] 36 |     let z = Rc::new(2);
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.44s
[INFO] [stderr]   Executable unittests src/main.rs (/opt/rustwide/target/debug/deps/multi_threading-0ab706bc32a09922)
[INFO] running `Command { std: "docker" "inspect" "4d53b83621b790b17bf8ef883f724888e7db91c733096944391c3d46a92c1790", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4d53b83621b790b17bf8ef883f724888e7db91c733096944391c3d46a92c1790", kill_on_drop: false }`
[INFO] [stdout] 4d53b83621b790b17bf8ef883f724888e7db91c733096944391c3d46a92c1790
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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", kill_on_drop: false }`
[INFO] [stdout] 23787b265a6bcd0ab9964d1f8b3ac07972ea5d20602269000e68c8b84cda1abe
[INFO] running `Command { std: "docker" "start" "-a" "23787b265a6bcd0ab9964d1f8b3ac07972ea5d20602269000e68c8b84cda1abe", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `res`
[INFO] [stderr]   --> src/main.rs:42:17
[INFO] [stderr]    |
[INFO] [stderr] 42 |             let res = match mutex.lock() {
[INFO] [stderr]    |                 ^^^ help: if this is intentional, prefix it with an underscore: `_res`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `z`
[INFO] [stderr]   --> src/main.rs:36:9
[INFO] [stderr]    |
[INFO] [stderr] 36 |     let z = Rc::new(2);
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stderr] 
[INFO] [stderr] warning: `multi-threading` (bin "multi-threading" test) generated 2 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/multi_threading-0ab706bc32a09922)
[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" "23787b265a6bcd0ab9964d1f8b3ac07972ea5d20602269000e68c8b84cda1abe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "23787b265a6bcd0ab9964d1f8b3ac07972ea5d20602269000e68c8b84cda1abe", kill_on_drop: false }`
[INFO] [stdout] 23787b265a6bcd0ab9964d1f8b3ac07972ea5d20602269000e68c8b84cda1abe