[INFO] fetching crate shared_arena 0.8.4...
[INFO] checking shared_arena-0.8.4 against beta for pr-78714
[INFO] extracting crate shared_arena 0.8.4 into /workspace/builds/worker-14/source
[INFO] validating manifest of crates.io crate shared_arena 0.8.4 on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate shared_arena 0.8.4
[INFO] finished tweaking crates.io crate shared_arena 0.8.4
[INFO] tweaked toml for crates.io crate shared_arena 0.8.4 written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2b555e92862295dc4fd77f7c8680d2413b2c7d74d5c866a76eb2821a86acbb1a
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "2b555e92862295dc4fd77f7c8680d2413b2c7d74d5c866a76eb2821a86acbb1a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2b555e92862295dc4fd77f7c8680d2413b2c7d74d5c866a76eb2821a86acbb1a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2b555e92862295dc4fd77f7c8680d2413b2c7d74d5c866a76eb2821a86acbb1a", kill_on_drop: false }`
[INFO] [stdout] 2b555e92862295dc4fd77f7c8680d2413b2c7d74d5c866a76eb2821a86acbb1a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--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] a28cbd9632b0cfb54eeb575c0d94fa1f3c1aa579408fd8542c6f56d7a91ea9a7
[INFO] running `Command { std: "docker" "start" "-a" "a28cbd9632b0cfb54eeb575c0d94fa1f3c1aa579408fd8542c6f56d7a91ea9a7", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking shared_arena v0.8.4 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> benches/mempool.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(test)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[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 `shared_arena`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "a28cbd9632b0cfb54eeb575c0d94fa1f3c1aa579408fd8542c6f56d7a91ea9a7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a28cbd9632b0cfb54eeb575c0d94fa1f3c1aa579408fd8542c6f56d7a91ea9a7", kill_on_drop: false }`
[INFO] [stdout] a28cbd9632b0cfb54eeb575c0d94fa1f3c1aa579408fd8542c6f56d7a91ea9a7