[INFO] fetching crate polars-io 0.20.0...
[INFO] testing polars-io-0.20.0 against beta-2022-04-10 for beta-1.61-1
[INFO] extracting crate polars-io 0.20.0 into /workspace/builds/worker-19/source
[INFO] validating manifest of crates.io crate polars-io 0.20.0 on toolchain beta-2022-04-10
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate polars-io 0.20.0
[INFO] finished tweaking crates.io crate polars-io 0.20.0
[INFO] tweaked toml for crates.io crate polars-io 0.20.0 written to /workspace/builds/worker-19/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "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-19/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 17e6a746b3dbc72e7aecb528ada375e6ba0bb7f2869cd6f25db04d8da160caa9
[INFO] running `Command { std: "docker" "start" "-a" "17e6a746b3dbc72e7aecb528ada375e6ba0bb7f2869cd6f25db04d8da160caa9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "17e6a746b3dbc72e7aecb528ada375e6ba0bb7f2869cd6f25db04d8da160caa9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "17e6a746b3dbc72e7aecb528ada375e6ba0bb7f2869cd6f25db04d8da160caa9", kill_on_drop: false }`
[INFO] [stdout] 17e6a746b3dbc72e7aecb528ada375e6ba0bb7f2869cd6f25db04d8da160caa9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c7c09e922d2e45b4bf0c640e58f2c11a6ea22e724cbabe46771dfda4efd0e045
[INFO] running `Command { std: "docker" "start" "-a" "c7c09e922d2e45b4bf0c640e58f2c11a6ea22e724cbabe46771dfda4efd0e045", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.91
[INFO] [stderr]    Compiling simdutf8 v0.1.4
[INFO] [stderr]    Compiling hash_hasher v2.0.3
[INFO] [stderr]    Compiling strength_reduce v0.2.3
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]    Compiling lexical-util v0.8.3
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-complex v0.4.0
[INFO] [stderr]    Compiling ahash v0.7.6
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]    Compiling num-bigint v0.4.3
[INFO] [stderr]    Compiling chrono v0.4.19
[INFO] [stderr]    Compiling lexical-parse-integer v0.8.3
[INFO] [stderr]    Compiling lexical-write-integer v0.8.3
[INFO] [stderr]    Compiling lexical-parse-float v0.8.3
[INFO] [stderr]    Compiling lexical-write-float v0.8.4
[INFO] [stderr]    Compiling lexical-core v0.8.3
[INFO] [stderr]    Compiling num-rational v0.4.0
[INFO] [stderr]    Compiling hashbrown v0.12.0
[INFO] [stderr]    Compiling num v0.4.0
[INFO] [stderr]    Compiling multiversion-macros v0.6.1
[INFO] [stderr]    Compiling bytemuck_derive v1.1.0
[INFO] [stderr]    Compiling thiserror-impl v1.0.30
[INFO] [stderr]    Compiling bytemuck v1.9.1
[INFO] [stderr]    Compiling multiversion v0.6.1
[INFO] [stderr]    Compiling arrow2 v0.10.1
[INFO] [stderr]    Compiling thiserror v1.0.30
[INFO] [stderr]    Compiling polars-arrow v0.20.0
[INFO] [stderr]    Compiling polars-core v0.20.0
[INFO] [stderr]    Compiling polars-io v0.20.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: enum is never used: `ScanAggregation`
[INFO] [stdout]  --> src/aggregations.rs:3:10
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub enum ScanAggregation {
[INFO] [stdout]   |          ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `finish`
[INFO] [stdout]   --> src/aggregations.rs:47:19
[INFO] [stdout]    |
[INFO] [stdout] 47 |     pub(crate) fn finish(&self, df: &DataFrame) -> Result<Series> {
[INFO] [stdout]    |                   ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `update_row_counts`
[INFO] [stdout]   --> src/utils.rs:72:15
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub(crate) fn update_row_counts(dfs: &mut [(DataFrame, u32)]) {
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `polars-core`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustc --crate-name polars_core --edition=2021 /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/polars-core-0.20.0/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="private"' -C metadata=661225f54737cfc8 -C extra-filename=-661225f54737cfc8 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern ahash=/opt/rustwide/target/debug/deps/libahash-029919755388f541.rmeta --extern anyhow=/opt/rustwide/target/debug/deps/libanyhow-8d913275b3a360fa.rmeta --extern arrow=/opt/rustwide/target/debug/deps/libarrow2-8a3cdfd2850a590f.rmeta --extern hashbrown=/opt/rustwide/target/debug/deps/libhashbrown-9ab8a5851b35d46e.rmeta --extern indexmap=/opt/rustwide/target/debug/deps/libindexmap-8997902f3d506c7d.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-86422d76b8bd90ed.rmeta --extern num=/opt/rustwide/target/debug/deps/libnum-27fd9c9d17b3d942.rmeta --extern num_cpus=/opt/rustwide/target/debug/deps/libnum_cpus-bd7920a8383fd529.rmeta --extern polars_arrow=/opt/rustwide/target/debug/deps/libpolars_arrow-fa46051d399a48a6.rmeta --extern rayon=/opt/rustwide/target/debug/deps/librayon-8238493e67c0df7f.rmeta --extern thiserror=/opt/rustwide/target/debug/deps/libthiserror-2a19eedfe1706561.rmeta --cap-lints allow --cap-lints=warn` (signal: 9, SIGKILL: kill)
[INFO] running `Command { std: "docker" "inspect" "c7c09e922d2e45b4bf0c640e58f2c11a6ea22e724cbabe46771dfda4efd0e045", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c7c09e922d2e45b4bf0c640e58f2c11a6ea22e724cbabe46771dfda4efd0e045", kill_on_drop: false }`
[INFO] [stdout] c7c09e922d2e45b4bf0c640e58f2c11a6ea22e724cbabe46771dfda4efd0e045