[INFO] fetching crate pixls_grep_rust 0.1.0...
[INFO] testing pixls_grep_rust-0.1.0 against beta-2025-10-28 for beta-1.92-2
[INFO] extracting crate pixls_grep_rust 0.1.0 into /workspace/builds/worker-1-tc2/source
[INFO] started tweaking crates.io crate pixls_grep_rust 0.1.0
[INFO] finished tweaking crates.io crate pixls_grep_rust 0.1.0
[INFO] tweaked toml for crates.io crate pixls_grep_rust 0.1.0 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate pixls_grep_rust 0.1.0 on toolchain beta-2025-10-28
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-10-28" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate pixls_grep_rust 0.1.0 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-2025-10-28" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9f730e911218696b5dc9ec5693a8b7a90e28b52996dba850146d748f7f82e2db
[INFO] running `Command { std: "docker" "start" "-a" "9f730e911218696b5dc9ec5693a8b7a90e28b52996dba850146d748f7f82e2db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9f730e911218696b5dc9ec5693a8b7a90e28b52996dba850146d748f7f82e2db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9f730e911218696b5dc9ec5693a8b7a90e28b52996dba850146d748f7f82e2db", kill_on_drop: false }`
[INFO] [stdout] 9f730e911218696b5dc9ec5693a8b7a90e28b52996dba850146d748f7f82e2db
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 15c1f345d68f1c8a1dce54e6c8013fef00e5ed5769ab9e82d18b4796f8abdac3
[INFO] running `Command { std: "docker" "start" "-a" "15c1f345d68f1c8a1dce54e6c8013fef00e5ed5769ab9e82d18b4796f8abdac3", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.70
[INFO] [stderr]    Compiling rustix v0.38.25
[INFO] [stderr]    Compiling memchr v2.6.4
[INFO] [stderr]    Compiling libc v0.2.150
[INFO] [stderr]    Compiling anstyle-query v1.0.0
[INFO] [stderr]    Compiling bitflags v2.4.1
[INFO] [stderr]    Compiling linux-raw-sys v0.4.11
[INFO] [stderr]    Compiling portable-atomic v1.5.1
[INFO] [stderr]    Compiling anstyle-parse v0.2.2
[INFO] [stderr]    Compiling heck v0.4.1
[INFO] [stderr]    Compiling log v0.4.20
[INFO] [stderr]    Compiling anstream v0.6.4
[INFO] [stderr]    Compiling clap_builder v4.4.9
[INFO] [stderr]    Compiling quote v1.0.33
[INFO] [stderr]    Compiling aho-corasick v1.1.2
[INFO] [stderr]    Compiling console v0.15.7
[INFO] [stderr]    Compiling syn v2.0.39
[INFO] [stderr]    Compiling is-terminal v0.4.9
[INFO] [stderr]    Compiling indicatif v0.17.7
[INFO] [stderr]    Compiling regex-automata v0.4.3
[INFO] [stderr]    Compiling clap_derive v4.4.7
[INFO] [stderr]    Compiling regex v1.10.2
[INFO] [stderr]    Compiling env_logger v0.10.1
[INFO] [stderr]    Compiling clap v4.4.10
[INFO] [stderr]    Compiling pixls_grep_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/lib.rs:4:13
[INFO] [stdout]   |
[INFO] [stdout] 4 |             writeln!(writer, "{}", line);
[INFO] [stdout]   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]   = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 4 |             let _ = writeln!(writer, "{}", line);
[INFO] [stdout]   |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 10.77s
[INFO] running `Command { std: "docker" "inspect" "15c1f345d68f1c8a1dce54e6c8013fef00e5ed5769ab9e82d18b4796f8abdac3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "15c1f345d68f1c8a1dce54e6c8013fef00e5ed5769ab9e82d18b4796f8abdac3", kill_on_drop: false }`
[INFO] [stdout] 15c1f345d68f1c8a1dce54e6c8013fef00e5ed5769ab9e82d18b4796f8abdac3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 08746d1482ad44d10b29048ec3f8a6206a74d0f3ebaf0b3ff4d7de28b25e9bc3
[INFO] running `Command { std: "docker" "start" "-a" "08746d1482ad44d10b29048ec3f8a6206a74d0f3ebaf0b3ff4d7de28b25e9bc3", kill_on_drop: false }`
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/lib.rs:4:13
[INFO] [stdout]   |
[INFO] [stdout] 4 |             writeln!(writer, "{}", line);
[INFO] [stdout]   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]   = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 4 |             let _ = writeln!(writer, "{}", line);
[INFO] [stdout]   |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling pixls_grep_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/lib.rs:4:13
[INFO] [stdout]   |
[INFO] [stdout] 4 |             writeln!(writer, "{}", line);
[INFO] [stdout]   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]   = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 4 |             let _ = writeln!(writer, "{}", line);
[INFO] [stdout]   |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.60s
[INFO] running `Command { std: "docker" "inspect" "08746d1482ad44d10b29048ec3f8a6206a74d0f3ebaf0b3ff4d7de28b25e9bc3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "08746d1482ad44d10b29048ec3f8a6206a74d0f3ebaf0b3ff4d7de28b25e9bc3", kill_on_drop: false }`
[INFO] [stdout] 08746d1482ad44d10b29048ec3f8a6206a74d0f3ebaf0b3ff4d7de28b25e9bc3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] af5d84a8b4a1e202fa39712dfa8710d0fbc7624eddd68552d8110168160f707f
[INFO] running `Command { std: "docker" "start" "-a" "af5d84a8b4a1e202fa39712dfa8710d0fbc7624eddd68552d8110168160f707f", kill_on_drop: false }`
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]  --> src/lib.rs:4:13
[INFO] [stderr]   |
[INFO] [stderr] 4 |             writeln!(writer, "{}", line);
[INFO] [stderr]   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]   = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]   |
[INFO] [stderr] 4 |             let _ = writeln!(writer, "{}", line);
[INFO] [stderr]   |             +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: `pixls_grep_rust` (lib) generated 1 warning
[INFO] [stderr] warning: `pixls_grep_rust` (lib test) generated 1 warning (1 duplicate)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.08s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/pixls_grep_rust-df6f0f19b16ae945)
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/pixls_grep_rust-1a2db72d71f4056d)
[INFO] [stdout] 
[INFO] [stderr]      Running tests/cli.rs (/opt/rustwide/target/debug/deps/cli-27c0991a31151d31)
[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] [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] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test check_answer_availability ... ok
[INFO] [stderr]    Doc-tests pixls_grep_rust
[INFO] [stdout] test find_a_match ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[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" "af5d84a8b4a1e202fa39712dfa8710d0fbc7624eddd68552d8110168160f707f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "af5d84a8b4a1e202fa39712dfa8710d0fbc7624eddd68552d8110168160f707f", kill_on_drop: false }`
[INFO] [stdout] af5d84a8b4a1e202fa39712dfa8710d0fbc7624eddd68552d8110168160f707f