[INFO] fetching crate ribbon 0.7.0...
[INFO] testing ribbon-0.7.0 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate ribbon 0.7.0 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate ribbon 0.7.0
[INFO] finished tweaking crates.io crate ribbon 0.7.0
[INFO] tweaked toml for crates.io crate ribbon 0.7.0 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate ribbon 0.7.0 on toolchain beta-2025-09-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 042ef248b25a1d92335ecc1ec531b9a7b7ec9ca93b468e2df16888c6e4328b45
[INFO] running `Command { std: "docker" "start" "-a" "042ef248b25a1d92335ecc1ec531b9a7b7ec9ca93b468e2df16888c6e4328b45", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "042ef248b25a1d92335ecc1ec531b9a7b7ec9ca93b468e2df16888c6e4328b45", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "042ef248b25a1d92335ecc1ec531b9a7b7ec9ca93b468e2df16888c6e4328b45", kill_on_drop: false }`
[INFO] [stdout] 042ef248b25a1d92335ecc1ec531b9a7b7ec9ca93b468e2df16888c6e4328b45
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f36308ce1dcf4af6198b785523cc414cc7218a76c20ffdf04effb1a3386ca79e
[INFO] running `Command { std: "docker" "start" "-a" "f36308ce1dcf4af6198b785523cc414cc7218a76c20ffdf04effb1a3386ca79e", kill_on_drop: false }`
[INFO] [stderr]    Compiling ribbon v0.7.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.14s
[INFO] running `Command { std: "docker" "inspect" "f36308ce1dcf4af6198b785523cc414cc7218a76c20ffdf04effb1a3386ca79e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f36308ce1dcf4af6198b785523cc414cc7218a76c20ffdf04effb1a3386ca79e", kill_on_drop: false }`
[INFO] [stdout] f36308ce1dcf4af6198b785523cc414cc7218a76c20ffdf04effb1a3386ca79e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 757b85a68e19b39abdfb7dc4c4bb881bb2ab65eddfe9f37796844bb74d85764c
[INFO] running `Command { std: "docker" "start" "-a" "757b85a68e19b39abdfb7dc4c4bb881bb2ab65eddfe9f37796844bb74d85764c", kill_on_drop: false }`
[INFO] [stderr]    Compiling ribbon v0.7.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.48s
[INFO] running `Command { std: "docker" "inspect" "757b85a68e19b39abdfb7dc4c4bb881bb2ab65eddfe9f37796844bb74d85764c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "757b85a68e19b39abdfb7dc4c4bb881bb2ab65eddfe9f37796844bb74d85764c", kill_on_drop: false }`
[INFO] [stdout] 757b85a68e19b39abdfb7dc4c4bb881bb2ab65eddfe9f37796844bb74d85764c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 5142124b24c62beb16902ec6a60d367772f9f99fec0fb9f60e2aa688260b794d
[INFO] running `Command { std: "docker" "start" "-a" "5142124b24c62beb16902ec6a60d367772f9f99fec0fb9f60e2aa688260b794d", kill_on_drop: false }`
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/ribbon-d9448b909d32ba8d)
[INFO] [stdout] 
[INFO] [stdout] running 14 tests
[INFO] [stdout] test band::tests::expands ... ok
[INFO] [stdout] test band::tests::is_iterator ... ok
[INFO] [stdout] test band::tests::makes_progress ... ok
[INFO] [stdout] test band::tests::peek_back ... ok
[INFO] [stdout] test band::tests::len_correct ... ok
[INFO] [stdout] test band::tests::pops_back ... ok
[INFO] [stdout] test band::tests::pops_front ... ok
[INFO] [stdout] test band::tests::peeks_at ... ok
[INFO] [stdout] test tape::tests::expands ... ok
[INFO] [stdout] test tape::tests::len_correct ... ok
[INFO] [stdout] test tape::tests::peeks_at ... ok
[INFO] [stdout] test tape::tests::is_iterator ... ok
[INFO] [stdout] test tape::tests::pops_back ... ok
[INFO] [stdout] test tape::tests::pops_front ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 14 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running tests/mod.rs (/opt/rustwide/target/debug/deps/mod-a64370d4b8692d83)
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stdout] test test_enroll ... ok
[INFO] [stdout] test test_band ... ok
[INFO] [stdout] test test_tape ... ok
[INFO] [stderr]    Doc-tests ribbon
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 16 tests
[INFO] [stdout] test src/ribbon.rs - ribbon::Ribbon::peek_at (line 241) ... ok
[INFO] [stdout] test src/ribbon.rs - ribbon::Ribbon::pop_back (line 173) ... ok
[INFO] [stdout] test src/ribbon.rs - ribbon::Ribbon::peek_back (line 192) ... ok
[INFO] [stdout] test src/ribbon.rs - ribbon::Ribbon::peek_front (line 137) ... ok
[INFO] [stdout] test src/ribbon.rs - ribbon::Ribbon::len (line 279) ... ok
[INFO] [stdout] test src/ribbon.rs - ribbon::Ribbon::expand (line 32) ... ok
[INFO] [stdout] test src/ribbon.rs - ribbon::Ribbon::peek_front_mut (line 156) ... ok
[INFO] [stdout] test src/ribbon.rs - ribbon::Ribbon::progress (line 12) ... ok
[INFO] [stdout] test src/lib.rs - (line 38) ... ok
[INFO] [stdout] test src/lib.rs - (line 25) ... ok
[INFO] [stdout] test src/ribbon.rs - ribbon::Ribbon::expand_n (line 57) ... ok
[INFO] [stdout] test src/ribbon.rs - ribbon::Ribbon::peek_at_mut (line 259) ... ok
[INFO] [stdout] test src/ribbon.rs - ribbon::Ribbon::peek_back_mut (line 216) ... ok
[INFO] [stdout] test src/ribbon.rs - ribbon::Ribbon::expand_while (line 93) ... ok
[INFO] [stdout] test src/ribbon.rs - ribbon::Ribbon::pop_front (line 119) ... ok
[INFO] [stdout] test src/ribbon.rs - ribbon::Ribbon::is_empty (line 296) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 16 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.55s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "5142124b24c62beb16902ec6a60d367772f9f99fec0fb9f60e2aa688260b794d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5142124b24c62beb16902ec6a60d367772f9f99fec0fb9f60e2aa688260b794d", kill_on_drop: false }`
[INFO] [stdout] 5142124b24c62beb16902ec6a60d367772f9f99fec0fb9f60e2aa688260b794d