[INFO] crate polygon2 0.3.0 is already in cache
[INFO] testing polygon2-0.3.0 against 1.44.0 for beta-1.45-1
[INFO] extracting crate polygon2 0.3.0 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate polygon2 0.3.0 on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate polygon2 0.3.0
[INFO] finished tweaking crates.io crate polygon2 0.3.0
[INFO] tweaked toml for crates.io crate polygon2 0.3.0 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] dfacce58dfd1190f87baa07c3cd6d85aca19396094001b78dfcc4f4f5da4d8a9
[INFO] running `"docker" "start" "-a" "dfacce58dfd1190f87baa07c3cd6d85aca19396094001b78dfcc4f4f5da4d8a9"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling cast_trait v0.1.2
[INFO] [stderr]    Compiling vec3 v0.2.1
[INFO] [stderr]    Compiling vec2 v0.2.1
[INFO] [stderr]    Compiling polygon2 v0.3.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(alloc)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]   --> src/point_in_rect.rs:24:9
[INFO] [stderr]    |
[INFO] [stderr] 24 |         (minx < &p[0] && &p[0] < maxx && miny < &p[1] && &p[1] < maxy)
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error; 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `polygon2`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "dfacce58dfd1190f87baa07c3cd6d85aca19396094001b78dfcc4f4f5da4d8a9"`
[INFO] running `"docker" "rm" "-f" "dfacce58dfd1190f87baa07c3cd6d85aca19396094001b78dfcc4f4f5da4d8a9"`
[INFO] [stdout] dfacce58dfd1190f87baa07c3cd6d85aca19396094001b78dfcc4f4f5da4d8a9