[INFO] fetching crate polars-readlines 0.2.1...
[INFO] testing polars-readlines-0.2.1 against beta-2026-04-21 for beta-1.96-2
[INFO] extracting crate polars-readlines 0.2.1 into /workspace/builds/worker-7-tc2/source
[INFO] started tweaking crates.io crate polars-readlines 0.2.1
[INFO] finished tweaking crates.io crate polars-readlines 0.2.1
[INFO] tweaked toml for crates.io crate polars-readlines 0.2.1 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate polars-readlines 0.2.1 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] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 134 packages to latest compatible versions
[INFO] [stderr]       Adding polars v0.42.0 (available: v0.53.0)
[INFO] [stderr]       Adding polars-arrow v0.42.0 (available: v0.53.0)
[INFO] [stderr]       Adding pyo3 v0.22.6 (available: v0.28.3)
[INFO] [stderr]       Adding pyo3-polars v0.16.1 (available: v0.26.0)
[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-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 0def320526e4d7df662b69317241730c3cd85ce618f4ae92f6fd62c05271359c
[INFO] running `Command { std: "docker" "start" "-a" "0def320526e4d7df662b69317241730c3cd85ce618f4ae92f6fd62c05271359c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0def320526e4d7df662b69317241730c3cd85ce618f4ae92f6fd62c05271359c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0def320526e4d7df662b69317241730c3cd85ce618f4ae92f6fd62c05271359c", kill_on_drop: false }`
[INFO] [stdout] 0def320526e4d7df662b69317241730c3cd85ce618f4ae92f6fd62c05271359c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] c6f22a31a23837c36e6076f73717694826a0eba4c6c3abd57001e2b6a90fa82b
[INFO] running `Command { std: "docker" "start" "-a" "c6f22a31a23837c36e6076f73717694826a0eba4c6c3abd57001e2b6a90fa82b", kill_on_drop: false }`
[INFO] [stderr]    Compiling object v0.37.3
[INFO] [stderr]    Compiling serde v1.0.228
[INFO] [stderr]    Compiling target-features v0.1.6
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling getrandom v0.3.4
[INFO] [stderr]    Compiling stacker v0.1.24
[INFO] [stderr]    Compiling smartstring v1.0.1
[INFO] [stderr]    Compiling polars-utils v0.42.0
[INFO] [stderr]    Compiling bytemuck_derive v1.10.2
[INFO] [stderr]    Compiling num-bigint v0.4.6
[INFO] [stderr]    Compiling arrow-schema v58.1.0
[INFO] [stderr]    Compiling half v2.7.1
[INFO] [stderr]    Compiling rayon v1.12.0
[INFO] [stderr]    Compiling raw-cpuid v11.6.0
[INFO] [stderr]    Compiling parking_lot_core v0.9.12
[INFO] [stderr]    Compiling num-complex v0.4.6
[INFO] [stderr]    Compiling memmap2 v0.7.1
[INFO] [stderr]    Compiling polars-arrow v0.42.0
[INFO] [stderr]    Compiling ahash v0.8.12
[INFO] [stderr]    Compiling fast-float v0.2.0
[INFO] [stderr]    Compiling parking_lot v0.12.5
[INFO] [stderr]    Compiling ethnum v1.5.3
[INFO] [stderr]    Compiling atoi_simd v0.15.6
[INFO] [stderr]    Compiling polars-arrow-format v0.1.0
[INFO] [stderr]    Compiling polars-compute v0.42.0
[INFO] [stderr]    Compiling polars-core v0.42.0
[INFO] [stderr]    Compiling fallible-streaming-iterator v0.1.9
[INFO] [stderr]    Compiling polars v0.42.0
[INFO] [stderr]    Compiling parquet-format-safe v0.2.4
[INFO] [stderr]    Compiling memmap2 v0.9.10
[INFO] [stderr]    Compiling streaming-decompression v0.1.2
[INFO] [stderr]    Compiling arrow-buffer v58.1.0
[INFO] [stderr]    Compiling bytemuck v1.25.0
[INFO] [stderr]    Compiling arrow-data v58.1.0
[INFO] [stderr]    Compiling hashbrown v0.14.5
[INFO] [stderr]    Compiling arrow-array v58.1.0
[INFO] [stderr]    Compiling polars-error v0.42.0
[INFO] [stderr]    Compiling multiversion-macros v0.7.4
[INFO] [stderr]    Compiling ar_archive_writer v0.5.1
[INFO] [stderr]    Compiling psm v0.1.31
[INFO] [stderr]    Compiling multiversion v0.7.4
[INFO] [stderr]    Compiling polars-row v0.42.0
[INFO] [stderr]    Compiling polars-parquet v0.42.0
[INFO] [stderr]    Compiling polars-readlines v0.2.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1m 40s
[INFO] running `Command { std: "docker" "inspect" "c6f22a31a23837c36e6076f73717694826a0eba4c6c3abd57001e2b6a90fa82b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c6f22a31a23837c36e6076f73717694826a0eba4c6c3abd57001e2b6a90fa82b", kill_on_drop: false }`
[INFO] [stdout] c6f22a31a23837c36e6076f73717694826a0eba4c6c3abd57001e2b6a90fa82b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 3ca5c8fd9f03542e2aaa2f258d120e635beba8c9f33e4f9e55f0db177f15fd50
[INFO] running `Command { std: "docker" "start" "-a" "3ca5c8fd9f03542e2aaa2f258d120e635beba8c9f33e4f9e55f0db177f15fd50", kill_on_drop: false }`
[INFO] [stderr]    Compiling polars-readlines v0.2.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 1.36s
[INFO] running `Command { std: "docker" "inspect" "3ca5c8fd9f03542e2aaa2f258d120e635beba8c9f33e4f9e55f0db177f15fd50", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3ca5c8fd9f03542e2aaa2f258d120e635beba8c9f33e4f9e55f0db177f15fd50", kill_on_drop: false }`
[INFO] [stdout] 3ca5c8fd9f03542e2aaa2f258d120e635beba8c9f33e4f9e55f0db177f15fd50
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 8b403cf36b854bad6b6a14ba84ade9fcbbcc9dc52553678850740f45b1a23e61
[INFO] running `Command { std: "docker" "start" "-a" "8b403cf36b854bad6b6a14ba84ade9fcbbcc9dc52553678850740f45b1a23e61", kill_on_drop: false }`
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.12s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/polars_readlines-46f725d437317bb0)
[INFO] [stderr]    Doc-tests polars_readlines
[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 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" "8b403cf36b854bad6b6a14ba84ade9fcbbcc9dc52553678850740f45b1a23e61", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8b403cf36b854bad6b6a14ba84ade9fcbbcc9dc52553678850740f45b1a23e61", kill_on_drop: false }`
[INFO] [stdout] 8b403cf36b854bad6b6a14ba84ade9fcbbcc9dc52553678850740f45b1a23e61