[INFO] fetching crate unmp-center 0.1.2...
[INFO] testing unmp-center-0.1.2 against beta-2021-09-08 for beta-1.56-1
[INFO] extracting crate unmp-center 0.1.2 into /workspace/builds/worker-14/source
[INFO] validating manifest of crates.io crate unmp-center 0.1.2 on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate unmp-center 0.1.2
[INFO] finished tweaking crates.io crate unmp-center 0.1.2
[INFO] tweaked toml for crates.io crate unmp-center 0.1.2 written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f34b5ff7e26d7784be4c423d39e6f0a8f1bde3cc4ba930ffc5a60951188f4539
[INFO] running `Command { std: "docker" "start" "-a" "f34b5ff7e26d7784be4c423d39e6f0a8f1bde3cc4ba930ffc5a60951188f4539", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f34b5ff7e26d7784be4c423d39e6f0a8f1bde3cc4ba930ffc5a60951188f4539", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f34b5ff7e26d7784be4c423d39e6f0a8f1bde3cc4ba930ffc5a60951188f4539", kill_on_drop: false }`
[INFO] [stdout] f34b5ff7e26d7784be4c423d39e6f0a8f1bde3cc4ba930ffc5a60951188f4539
[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=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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e9bd31b14cd9ada1a9ab53c7c8eaa54ad2bbe0ea5b5ce9d2ed77d27afde2d7c3
[INFO] running `Command { std: "docker" "start" "-a" "e9bd31b14cd9ada1a9ab53c7c8eaa54ad2bbe0ea5b5ce9d2ed77d27afde2d7c3", kill_on_drop: false }`
[INFO] [stderr]    Compiling crc16 v0.4.0
[INFO] [stderr]    Compiling async-task v4.0.3
[INFO] [stderr]    Compiling fixed-queue v0.3.10
[INFO] [stderr]    Compiling unmp-id v1.4.0
[INFO] [stderr]    Compiling md5 v0.7.0
[INFO] [stderr]    Compiling unmp-id v2.0.0
[INFO] [stderr]    Compiling futures-intrusive v0.4.0
[INFO] [stderr]    Compiling getrandom v0.2.3
[INFO] [stderr]    Compiling unmp-center-core v0.1.3
[INFO] [stderr]    Compiling task-stream v0.3.3
[INFO] [stderr]    Compiling unmp v0.4.5
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/unmp-0.4.5/src/lib.rs:8:1
[INFO] [stdout]   |
[INFO] [stdout] 8 | #![feature(const_btree_new)]
[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 `unmp` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "e9bd31b14cd9ada1a9ab53c7c8eaa54ad2bbe0ea5b5ce9d2ed77d27afde2d7c3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e9bd31b14cd9ada1a9ab53c7c8eaa54ad2bbe0ea5b5ce9d2ed77d27afde2d7c3", kill_on_drop: false }`
[INFO] [stdout] e9bd31b14cd9ada1a9ab53c7c8eaa54ad2bbe0ea5b5ce9d2ed77d27afde2d7c3