[INFO] fetching crate polars-arrow 0.35.4...
[INFO] checking polars-arrow-0.35.4 against master#158f00a1c5175648af6f6099b075f78d1d014a28 for pr-121251
[INFO] extracting crate polars-arrow 0.35.4 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate polars-arrow 0.35.4 on toolchain 158f00a1c5175648af6f6099b075f78d1d014a28
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+158f00a1c5175648af6f6099b075f78d1d014a28" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate polars-arrow 0.35.4
[INFO] finished tweaking crates.io crate polars-arrow 0.35.4
[INFO] tweaked toml for crates.io crate polars-arrow 0.35.4 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+158f00a1c5175648af6f6099b075f78d1d014a28" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+158f00a1c5175648af6f6099b075f78d1d014a28" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rand_regex v0.15.1
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+158f00a1c5175648af6f6099b075f78d1d014a28" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
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[INFO] [stdout] warning: trait `Container` is never used
[INFO] [stdout]    --> src/array/mod.rs:148:18
[INFO] [stdout]     |
[INFO] [stdout] 148 | pub(crate) trait Container {
[INFO] [stdout]     |                  ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `values` and `size` are never used
[INFO] [stdout]    --> src/array/fixed_size_binary/mod.rs:269:8
[INFO] [stdout]     |
[INFO] [stdout] 268 | pub trait FixedSizeBinaryValues {
[INFO] [stdout]     |           --------------------- methods in this trait
[INFO] [stdout] 269 |     fn values(&self) -> &[u8];
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 270 |     fn size(&self) -> usize;
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/buffer/mod.rs:11:24
[INFO] [stdout]    |
[INFO] [stdout] 11 |     InternalArrowArray(InternalArrowArray),
[INFO] [stdout]    |     ------------------ ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 11 |     InternalArrowArray(()),
[INFO] [stdout]    |                        ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `n_buffers` is never used
[INFO] [stdout]    --> src/ffi/array.rs:476:8
[INFO] [stdout]     |
[INFO] [stdout] 429 | pub trait ArrowArrayRef: std::fmt::Debug {
[INFO] [stdout]     |           ------------- method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 476 |     fn n_buffers(&self) -> usize;
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
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[INFO] [stdout] warning: trait `Container` is never used
[INFO] [stdout]    --> src/array/mod.rs:148:18
[INFO] [stdout]     |
[INFO] [stdout] 148 | pub(crate) trait Container {
[INFO] [stdout]     |                  ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `values` and `size` are never used
[INFO] [stdout]    --> src/array/fixed_size_binary/mod.rs:269:8
[INFO] [stdout]     |
[INFO] [stdout] 268 | pub trait FixedSizeBinaryValues {
[INFO] [stdout]     |           --------------------- methods in this trait
[INFO] [stdout] 269 |     fn values(&self) -> &[u8];
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 270 |     fn size(&self) -> usize;
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/buffer/mod.rs:11:24
[INFO] [stdout]    |
[INFO] [stdout] 11 |     InternalArrowArray(InternalArrowArray),
[INFO] [stdout]    |     ------------------ ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 11 |     InternalArrowArray(()),
[INFO] [stdout]    |                        ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `n_buffers` is never used
[INFO] [stdout]    --> src/ffi/array.rs:476:8
[INFO] [stdout]     |
[INFO] [stdout] 429 | pub trait ArrowArrayRef: std::fmt::Debug {
[INFO] [stdout]     |           ------------- method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 476 |     fn n_buffers(&self) -> usize;
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 13.47s
[INFO] running `Command { std: "docker" "inspect" "3beb05e5d132efbc3d2da14c2c7bcb4e4e427009b6f1a1892beca0d8d8b954e8", kill_on_drop: false }`
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[INFO] [stdout] 3beb05e5d132efbc3d2da14c2c7bcb4e4e427009b6f1a1892beca0d8d8b954e8
