[INFO] fetching crate polars 0.10.1...
[INFO] testing polars-0.10.1 against 1.49.0 for beta-1.50-1
[INFO] extracting crate polars 0.10.1 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate polars 0.10.1 on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate polars 0.10.1
[INFO] finished tweaking crates.io crate polars 0.10.1
[INFO] tweaked toml for crates.io crate polars 0.10.1 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 5e1363501e80fdeb8c8368e27ddb841aea87575051324331e73b39c21674bdc0
[INFO] running `Command { std: "docker" "start" "-a" "5e1363501e80fdeb8c8368e27ddb841aea87575051324331e73b39c21674bdc0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5e1363501e80fdeb8c8368e27ddb841aea87575051324331e73b39c21674bdc0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5e1363501e80fdeb8c8368e27ddb841aea87575051324331e73b39c21674bdc0", kill_on_drop: false }`
[INFO] [stdout] 5e1363501e80fdeb8c8368e27ddb841aea87575051324331e73b39c21674bdc0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] e48297470e2a0775cbdc0ff20f2cabb5ada2305b41a94045b6dd3ec1f2b4714c
[INFO] running `Command { std: "docker" "start" "-a" "e48297470e2a0775cbdc0ff20f2cabb5ada2305b41a94045b6dd3ec1f2b4714c", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.118
[INFO] [stderr]    Compiling packed_simd_2 v0.3.4
[INFO] [stderr]    Compiling zstd-safe v2.0.6+zstd.1.4.7
[INFO] [stderr]    Compiling alloc-no-stdlib v2.0.1
[INFO] [stderr]    Compiling serde_json v1.0.61
[INFO] [stderr]    Compiling lexical-core v0.7.4
[INFO] [stderr]    Compiling integer-encoding v1.1.5
[INFO] [stderr]    Compiling getrandom v0.2.1
[INFO] [stderr]    Compiling snap v1.0.3
[INFO] [stderr]    Compiling parquet v2.0.0
[INFO] [stderr]    Compiling hex v0.4.2
[INFO] [stderr]    Compiling unsafe_unwrap v0.1.0
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-bigint v0.3.1
[INFO] [stderr]    Compiling num-rational v0.3.2
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]    Compiling flatbuffers v0.6.1
[INFO] [stderr]    Compiling alloc-stdlib v0.2.1
[INFO] [stderr]    Compiling jobserver v0.1.21
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]    Compiling time v0.1.44
[INFO] [stderr]    Compiling memmap v0.7.0
[INFO] [stderr]    Compiling mio v0.7.7
[INFO] [stderr]    Compiling crossbeam-queue v0.3.1
[INFO] [stderr]    Compiling flate2 v1.0.19
[INFO] [stderr]    Compiling threadpool v1.8.1
[INFO] [stderr]    Compiling brotli-decompressor v2.3.1
[INFO] [stderr]    Compiling thiserror-impl v1.0.23
[INFO] [stderr]    Compiling strum_macros v0.20.1
[INFO] [stderr]    Compiling cc v1.0.66
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling rayon-core v1.9.0
[INFO] [stderr]    Compiling crossbeam v0.8.0
[INFO] [stderr]    Compiling ahash v0.5.10
[INFO] [stderr]    Compiling signal-hook v0.1.17
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling crossterm v0.19.0
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/packed_simd_2-0.3.4/src/lib.rs:202:1
[INFO] [stdout]     |
[INFO] [stdout] 202 | / #![feature(
[INFO] [stdout] 203 | |     repr_simd,
[INFO] [stdout] 204 | |     rustc_attrs,
[INFO] [stdout] 205 | |     const_fn,
[INFO] [stdout] ...   |
[INFO] [stdout] 215 | |     llvm_asm
[INFO] [stdout] 216 | | )]
[INFO] [stdout]     | |__^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling ordered-float v1.1.1
[INFO] [stderr]    Compiling num-complex v0.3.1
[INFO] [stderr]    Compiling rayon v1.5.0
[INFO] [stderr]    Compiling brotli v3.3.0
[INFO] [stderr]    Compiling lexical v5.2.0
[INFO] [stderr]    Compiling zstd-sys v1.4.18+zstd.1.4.7
[INFO] [stderr]    Compiling lz4-sys v1.9.2
[INFO] [stderr]    Compiling chrono v0.4.19
[INFO] [stderr]    Compiling thrift v0.13.0
[INFO] [stderr]    Compiling thiserror v1.0.23
[INFO] [stderr]    Compiling comfy-table v1.5.0
[INFO] [stderr]    Compiling parquet-format v2.6.1
[INFO] [stderr]    Compiling bstr v0.2.14
[INFO] [stderr]    Compiling num v0.3.1
[INFO] [stderr]    Compiling csv v1.1.5
[INFO] [stderr]    Compiling lz4 v1.23.2
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `packed_simd_2`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "e48297470e2a0775cbdc0ff20f2cabb5ada2305b41a94045b6dd3ec1f2b4714c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e48297470e2a0775cbdc0ff20f2cabb5ada2305b41a94045b6dd3ec1f2b4714c", kill_on_drop: false }`
[INFO] [stdout] e48297470e2a0775cbdc0ff20f2cabb5ada2305b41a94045b6dd3ec1f2b4714c