[INFO] cloning repository https://github.com/marcferraro/rust_book_chapter_practice
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/marcferraro/rust_book_chapter_practice" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmarcferraro%2Frust_book_chapter_practice", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmarcferraro%2Frust_book_chapter_practice'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a8d2484204322e43345e2d4ef5c93ccc32e4a11e
[INFO] testing marcferraro/rust_book_chapter_practice against beta-2026-04-21 for beta-1.96-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmarcferraro%2Frust_book_chapter_practice" "/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/marcferraro/rust_book_chapter_practice
[INFO] finished tweaking git repo https://github.com/marcferraro/rust_book_chapter_practice
[INFO] tweaked toml for git repo https://github.com/marcferraro/rust_book_chapter_practice written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/marcferraro/rust_book_chapter_practice on toolchain beta-2026-04-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/marcferraro/rust_book_chapter_practice 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-2026-04-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 71f9b3e61528ef80e526265aac40b0f2c9cb7067ba331bd5e7d870b2fa39dfff
[INFO] running `Command { std: "docker" "start" "-a" "71f9b3e61528ef80e526265aac40b0f2c9cb7067ba331bd5e7d870b2fa39dfff", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "71f9b3e61528ef80e526265aac40b0f2c9cb7067ba331bd5e7d870b2fa39dfff", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "71f9b3e61528ef80e526265aac40b0f2c9cb7067ba331bd5e7d870b2fa39dfff", kill_on_drop: false }`
[INFO] [stdout] 71f9b3e61528ef80e526265aac40b0f2c9cb7067ba331bd5e7d870b2fa39dfff
[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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 26cb382ef9c258c6bdc458fad47a1c3a8b903a4094509bfed89feb4cf4c517df
[INFO] running `Command { std: "docker" "start" "-a" "26cb382ef9c258c6bdc458fad47a1c3a8b903a4094509bfed89feb4cf4c517df", kill_on_drop: false }`
[INFO] [stderr]    Compiling chapter_practice v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.75s
[INFO] running `Command { std: "docker" "inspect" "26cb382ef9c258c6bdc458fad47a1c3a8b903a4094509bfed89feb4cf4c517df", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "26cb382ef9c258c6bdc458fad47a1c3a8b903a4094509bfed89feb4cf4c517df", kill_on_drop: false }`
[INFO] [stdout] 26cb382ef9c258c6bdc458fad47a1c3a8b903a4094509bfed89feb4cf4c517df
[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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0c0a8fdec28bef0221d2c96f10234e4a9c3a9991f3ad80c315e8b1b9f8242f02
[INFO] running `Command { std: "docker" "start" "-a" "0c0a8fdec28bef0221d2c96f10234e4a9c3a9991f3ad80c315e8b1b9f8242f02", kill_on_drop: false }`
[INFO] [stderr]    Compiling chapter_practice v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.58s
[INFO] running `Command { std: "docker" "inspect" "0c0a8fdec28bef0221d2c96f10234e4a9c3a9991f3ad80c315e8b1b9f8242f02", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0c0a8fdec28bef0221d2c96f10234e4a9c3a9991f3ad80c315e8b1b9f8242f02", kill_on_drop: false }`
[INFO] [stdout] 0c0a8fdec28bef0221d2c96f10234e4a9c3a9991f3ad80c315e8b1b9f8242f02
[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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 82049b9d0430a7ab21c3768ed9196cfc4284df5809216f16ec41facda78de0ab
[INFO] running `Command { std: "docker" "start" "-a" "82049b9d0430a7ab21c3768ed9196cfc4284df5809216f16ec41facda78de0ab", kill_on_drop: false }`
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/chapter_practice-94f1b240c599d7b2)
[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/main.rs (/opt/rustwide/target/debug/deps/chapter_practice-94533da69c9e75cf)
[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]    Doc-tests chapter_practice
[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" "82049b9d0430a7ab21c3768ed9196cfc4284df5809216f16ec41facda78de0ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "82049b9d0430a7ab21c3768ed9196cfc4284df5809216f16ec41facda78de0ab", kill_on_drop: false }`
[INFO] [stdout] 82049b9d0430a7ab21c3768ed9196cfc4284df5809216f16ec41facda78de0ab
