[INFO] cloning repository https://github.com/kalinsky/rust_introduction
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kalinsky/rust_introduction" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkalinsky%2Frust_introduction", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkalinsky%2Frust_introduction'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ef8bcce5dfb02a792018dbabd77ac0fc05b51191
[INFO] testing kalinsky/rust_introduction against beta-2021-09-08 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkalinsky%2Frust_introduction" "/workspace/builds/worker-13/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kalinsky/rust_introduction on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/kalinsky/rust_introduction
[INFO] finished tweaking git repo https://github.com/kalinsky/rust_introduction
[INFO] tweaked toml for git repo https://github.com/kalinsky/rust_introduction written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate git repo https://github.com/kalinsky/rust_introduction already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bc32266d5b798725d5fc45fada97e8eac0a86975bdc02cfc9d75c1777bc67a62
[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" "bc32266d5b798725d5fc45fada97e8eac0a86975bdc02cfc9d75c1777bc67a62", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bc32266d5b798725d5fc45fada97e8eac0a86975bdc02cfc9d75c1777bc67a62", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bc32266d5b798725d5fc45fada97e8eac0a86975bdc02cfc9d75c1777bc67a62", kill_on_drop: false }`
[INFO] [stdout] bc32266d5b798725d5fc45fada97e8eac0a86975bdc02cfc9d75c1777bc67a62
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 921a258dc6b34fa023180691bc78290cd21ad00ef568f9782819efcba4a901e4
[INFO] running `Command { std: "docker" "start" "-a" "921a258dc6b34fa023180691bc78290cd21ad00ef568f9782819efcba4a901e4", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust_introduction v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `admin_user`
[INFO] [stdout]   --> src/structs.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let admin_user = build_power_user(
[INFO] [stdout]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_admin_user`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.91s
[INFO] running `Command { std: "docker" "inspect" "921a258dc6b34fa023180691bc78290cd21ad00ef568f9782819efcba4a901e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "921a258dc6b34fa023180691bc78290cd21ad00ef568f9782819efcba4a901e4", kill_on_drop: false }`
[INFO] [stdout] 921a258dc6b34fa023180691bc78290cd21ad00ef568f9782819efcba4a901e4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "+beta-2021-09-08" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f67ddac173da14f8ddd6ed8f99e004731636ab3c5dc5c79bc9c9526aa4889a0e
[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" "f67ddac173da14f8ddd6ed8f99e004731636ab3c5dc5c79bc9c9526aa4889a0e", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust_introduction v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `admin_user`
[INFO] [stdout]   --> src/structs.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let admin_user = build_power_user(
[INFO] [stdout]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_admin_user`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.91s
[INFO] running `Command { std: "docker" "inspect" "f67ddac173da14f8ddd6ed8f99e004731636ab3c5dc5c79bc9c9526aa4889a0e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f67ddac173da14f8ddd6ed8f99e004731636ab3c5dc5c79bc9c9526aa4889a0e", kill_on_drop: false }`
[INFO] [stdout] f67ddac173da14f8ddd6ed8f99e004731636ab3c5dc5c79bc9c9526aa4889a0e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "+beta-2021-09-08" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] f9ff210826c2450e5db8b19a67a556dbea51cd876fd5fa2d91bd7fc09660bcd4
[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" "f9ff210826c2450e5db8b19a67a556dbea51cd876fd5fa2d91bd7fc09660bcd4", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `admin_user`
[INFO] [stderr]   --> src/structs.rs:35:9
[INFO] [stderr]    |
[INFO] [stderr] 35 |     let admin_user = build_power_user(
[INFO] [stderr]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_admin_user`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `rust_introduction` (bin "rust_introduction" test) generated 1 warning
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/rust_introduction-2622e5d3b02f34a9)
[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" "f9ff210826c2450e5db8b19a67a556dbea51cd876fd5fa2d91bd7fc09660bcd4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f9ff210826c2450e5db8b19a67a556dbea51cd876fd5fa2d91bd7fc09660bcd4", kill_on_drop: false }`
[INFO] [stdout] f9ff210826c2450e5db8b19a67a556dbea51cd876fd5fa2d91bd7fc09660bcd4