[INFO] cloning repository https://github.com/zhangaz1/TheRustProgrammingLanguageBookExamples
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/zhangaz1/TheRustProgrammingLanguageBookExamples" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzhangaz1%2FTheRustProgrammingLanguageBookExamples", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzhangaz1%2FTheRustProgrammingLanguageBookExamples'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e201eb3f6b6dc3622e535f5ae1a33ae2e06267f6
[INFO] testing zhangaz1/TheRustProgrammingLanguageBookExamples against beta-2022-02-22 for beta-1.60-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzhangaz1%2FTheRustProgrammingLanguageBookExamples" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/zhangaz1/TheRustProgrammingLanguageBookExamples on toolchain beta-2022-02-22
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/zhangaz1/TheRustProgrammingLanguageBookExamples
[INFO] finished tweaking git repo https://github.com/zhangaz1/TheRustProgrammingLanguageBookExamples
[INFO] tweaked toml for git repo https://github.com/zhangaz1/TheRustProgrammingLanguageBookExamples written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/zhangaz1/TheRustProgrammingLanguageBookExamples already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "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-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d29b8793501a2a7e580233d8a0a5547ee35f90ae7f0a1ceedd73a103131ce9cf
[INFO] running `Command { std: "docker" "start" "-a" "d29b8793501a2a7e580233d8a0a5547ee35f90ae7f0a1ceedd73a103131ce9cf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d29b8793501a2a7e580233d8a0a5547ee35f90ae7f0a1ceedd73a103131ce9cf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d29b8793501a2a7e580233d8a0a5547ee35f90ae7f0a1ceedd73a103131ce9cf", kill_on_drop: false }`
[INFO] [stdout] d29b8793501a2a7e580233d8a0a5547ee35f90ae7f0a1ceedd73a103131ce9cf
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 257fbc4fac1c30219de9654b4ba7d60d89c64acb8cfde6ebe41ec73e5f1874ba
[INFO] running `Command { std: "docker" "start" "-a" "257fbc4fac1c30219de9654b4ba7d60d89c64acb8cfde6ebe41ec73e5f1874ba", kill_on_drop: false }`
[INFO] [stderr]    Compiling TheRustProgrammingLanguageBookExamples v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]  --> src/main.rs:5:13
[INFO] [stdout]   |
[INFO] [stdout] 5 |         let y = &x[0];
[INFO] [stdout]   |             ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate `TheRustProgrammingLanguageBookExamples` should have a snake case name
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout]   = help: convert the identifier to snake case: `the_rust_programming_language_book_examples`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.92s
[INFO] running `Command { std: "docker" "inspect" "257fbc4fac1c30219de9654b4ba7d60d89c64acb8cfde6ebe41ec73e5f1874ba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "257fbc4fac1c30219de9654b4ba7d60d89c64acb8cfde6ebe41ec73e5f1874ba", kill_on_drop: false }`
[INFO] [stdout] 257fbc4fac1c30219de9654b4ba7d60d89c64acb8cfde6ebe41ec73e5f1874ba
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 59bf2be63422767802365adce50b9748547874b8c38eba0627c33c25b6af2108
[INFO] running `Command { std: "docker" "start" "-a" "59bf2be63422767802365adce50b9748547874b8c38eba0627c33c25b6af2108", kill_on_drop: false }`
[INFO] [stderr]    Compiling TheRustProgrammingLanguageBookExamples v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]  --> src/main.rs:5:13
[INFO] [stdout]   |
[INFO] [stdout] 5 |         let y = &x[0];
[INFO] [stdout]   |             ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate `TheRustProgrammingLanguageBookExamples` should have a snake case name
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout]   = help: convert the identifier to snake case: `the_rust_programming_language_book_examples`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.27s
[INFO] running `Command { std: "docker" "inspect" "59bf2be63422767802365adce50b9748547874b8c38eba0627c33c25b6af2108", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "59bf2be63422767802365adce50b9748547874b8c38eba0627c33c25b6af2108", kill_on_drop: false }`
[INFO] [stdout] 59bf2be63422767802365adce50b9748547874b8c38eba0627c33c25b6af2108
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 20ba7a99cf363e25a324658ebe8b9730c3f513476b51f99f80c050e71adc86b7
[INFO] running `Command { std: "docker" "start" "-a" "20ba7a99cf363e25a324658ebe8b9730c3f513476b51f99f80c050e71adc86b7", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]  --> src/main.rs:5:13
[INFO] [stderr]   |
[INFO] [stderr] 5 |         let y = &x[0];
[INFO] [stderr]   |             ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: crate `TheRustProgrammingLanguageBookExamples` should have a snake case name
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr]   = help: convert the identifier to snake case: `the_rust_programming_language_book_examples`
[INFO] [stderr] 
[INFO] [stderr] warning: `TheRustProgrammingLanguageBookExamples` (bin "TheRustProgrammingLanguageBookExamples" test) generated 2 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/TheRustProgrammingLanguageBookExamples-049d0629604d8342)
[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" "20ba7a99cf363e25a324658ebe8b9730c3f513476b51f99f80c050e71adc86b7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "20ba7a99cf363e25a324658ebe8b9730c3f513476b51f99f80c050e71adc86b7", kill_on_drop: false }`
[INFO] [stdout] 20ba7a99cf363e25a324658ebe8b9730c3f513476b51f99f80c050e71adc86b7