[INFO] cloning repository https://github.com/GZ315200/rust_learning
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/GZ315200/rust_learning" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FGZ315200%2Frust_learning", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FGZ315200%2Frust_learning'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 51a88f685fe7bd9e3fc6f3898513846c10726d41
[INFO] testing GZ315200/rust_learning against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FGZ315200%2Frust_learning" "/workspace/builds/worker-56/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-56/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/GZ315200/rust_learning on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/GZ315200/rust_learning
[INFO] finished tweaking git repo https://github.com/GZ315200/rust_learning
[INFO] tweaked toml for git repo https://github.com/GZ315200/rust_learning written to /workspace/builds/worker-56/source/Cargo.toml
[INFO] crate git repo https://github.com/GZ315200/rust_learning already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-56/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-56/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f6c78ca60729a2892d4a1e562cea97cefdd83a49c19986fabaad0a3bb533d445
[INFO] running `Command { std: "docker" "start" "-a" "f6c78ca60729a2892d4a1e562cea97cefdd83a49c19986fabaad0a3bb533d445", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f6c78ca60729a2892d4a1e562cea97cefdd83a49c19986fabaad0a3bb533d445", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f6c78ca60729a2892d4a1e562cea97cefdd83a49c19986fabaad0a3bb533d445", kill_on_drop: false }`
[INFO] [stdout] f6c78ca60729a2892d4a1e562cea97cefdd83a49c19986fabaad0a3bb533d445
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-56/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-56/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e1f85d0d3a604ffa94ef2ac2f63ea8dbe6cbcf818900b39bb81b75456e2b4304
[INFO] running `Command { std: "docker" "start" "-a" "e1f85d0d3a604ffa94ef2ac2f63ea8dbe6cbcf818900b39bb81b75456e2b4304", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.66
[INFO] [stderr]    Compiling getrandom v0.1.13
[INFO] [stderr]    Compiling cfg-if v0.1.10
[INFO] [stderr]    Compiling ppv-lite86 v0.2.6
[INFO] [stderr]    Compiling variables v0.1.0 (/opt/rustwide/workdir/variables)
[INFO] [stderr]    Compiling ownership v0.1.0 (/opt/rustwide/workdir/ownership)
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> variables/src/main.rs:65:10
[INFO] [stdout]    |
[INFO] [stdout] 65 |     let (x, y, z) = tup;
[INFO] [stdout]    |          ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]   --> variables/src/main.rs:65:16
[INFO] [stdout]    |
[INFO] [stdout] 65 |     let (x, y, z) = tup;
[INFO] [stdout]    |                ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling c2-chacha v0.2.3
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling rand_chacha v0.2.1
[INFO] [stderr]    Compiling rand v0.7.2
[INFO] [stderr]    Compiling guessing_game v0.1.0 (/opt/rustwide/workdir/guessing_game)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 31s
[INFO] running `Command { std: "docker" "inspect" "e1f85d0d3a604ffa94ef2ac2f63ea8dbe6cbcf818900b39bb81b75456e2b4304", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e1f85d0d3a604ffa94ef2ac2f63ea8dbe6cbcf818900b39bb81b75456e2b4304", kill_on_drop: false }`
[INFO] [stdout] e1f85d0d3a604ffa94ef2ac2f63ea8dbe6cbcf818900b39bb81b75456e2b4304
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-56/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-56/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 188a3cffe387147f5b47a56bc164ea6f0954baeceaf344b5dc639113a6869192
[INFO] running `Command { std: "docker" "start" "-a" "188a3cffe387147f5b47a56bc164ea6f0954baeceaf344b5dc639113a6869192", kill_on_drop: false }`
[INFO] [stderr]    Compiling ownership v0.1.0 (/opt/rustwide/workdir/ownership)
[INFO] [stderr]    Compiling variables v0.1.0 (/opt/rustwide/workdir/variables)
[INFO] [stderr]    Compiling guessing_game v0.1.0 (/opt/rustwide/workdir/guessing_game)
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> variables/src/main.rs:65:10
[INFO] [stdout]    |
[INFO] [stdout] 65 |     let (x, y, z) = tup;
[INFO] [stdout]    |          ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]   --> variables/src/main.rs:65:16
[INFO] [stdout]    |
[INFO] [stdout] 65 |     let (x, y, z) = tup;
[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 0.58s
[INFO] running `Command { std: "docker" "inspect" "188a3cffe387147f5b47a56bc164ea6f0954baeceaf344b5dc639113a6869192", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "188a3cffe387147f5b47a56bc164ea6f0954baeceaf344b5dc639113a6869192", kill_on_drop: false }`
[INFO] [stdout] 188a3cffe387147f5b47a56bc164ea6f0954baeceaf344b5dc639113a6869192
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-56/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-56/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 64b14c7c0a880a84ccacfad510d87f25f03086882b9c28d68a535eaa427b304e
[INFO] running `Command { std: "docker" "start" "-a" "64b14c7c0a880a84ccacfad510d87f25f03086882b9c28d68a535eaa427b304e", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stdout] 
[INFO] [stderr]   --> variables/src/main.rs:65:10
[INFO] [stdout] running 0 tests
[INFO] [stderr]    |
[INFO] [stdout] 
[INFO] [stderr] 65 |     let (x, y, z) = tup;
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr]    |          ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stderr]    |
[INFO] [stdout] 
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] running 0 tests
[INFO] [stderr] 
[INFO] [stdout] 
[INFO] [stderr] warning: unused variable: `z`
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr]   --> variables/src/main.rs:65:16
[INFO] [stdout] 
[INFO] [stderr]    |
[INFO] [stdout] 
[INFO] [stderr] 65 |     let (x, y, z) = tup;
[INFO] [stdout] running 0 tests
[INFO] [stderr]    |                ^ help: if this is intentional, prefix it with an underscore: `_z`
[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] warning: `variables` (bin "variables" test) generated 2 warnings
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.98s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/guessing_game-9c10381122ee317b)
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/ownership-5f069e34dde33364)
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/variables-92e9254919319305)
[INFO] running `Command { std: "docker" "inspect" "64b14c7c0a880a84ccacfad510d87f25f03086882b9c28d68a535eaa427b304e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "64b14c7c0a880a84ccacfad510d87f25f03086882b9c28d68a535eaa427b304e", kill_on_drop: false }`
[INFO] [stdout] 64b14c7c0a880a84ccacfad510d87f25f03086882b9c28d68a535eaa427b304e