[INFO] fetching crate unmp-center 0.1.2...
[INFO] testing unmp-center-0.1.2 against beta-2021-08-01 for beta-1.55-1
[INFO] extracting crate unmp-center 0.1.2 into /workspace/builds/worker-92/source
[INFO] validating manifest of crates.io crate unmp-center 0.1.2 on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "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-92/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded unmp-center-core v0.1.3
[INFO] [stderr]   Downloaded unmp-protocol-raw v0.3.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-92/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-92/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e8e0ae835d53f6138aa58d11799a0c0aec2772a333d9270e7cce11a9a3ab6f18
[INFO] running `Command { std: "docker" "start" "-a" "e8e0ae835d53f6138aa58d11799a0c0aec2772a333d9270e7cce11a9a3ab6f18", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e8e0ae835d53f6138aa58d11799a0c0aec2772a333d9270e7cce11a9a3ab6f18", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e8e0ae835d53f6138aa58d11799a0c0aec2772a333d9270e7cce11a9a3ab6f18", kill_on_drop: false }`
[INFO] [stdout] e8e0ae835d53f6138aa58d11799a0c0aec2772a333d9270e7cce11a9a3ab6f18
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-92/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-92/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4bc48e06dd608a30496c695cef6059770a23ba06278f275f15729506d06af779
[INFO] running `Command { std: "docker" "start" "-a" "4bc48e06dd608a30496c695cef6059770a23ba06278f275f15729506d06af779", kill_on_drop: false }`
[INFO] [stderr]    Compiling futures-core v0.3.16
[INFO] [stderr]    Compiling byteorder v1.4.3
[INFO] [stderr]    Compiling libc v0.2.98
[INFO] [stderr]    Compiling heapless v0.7.4
[INFO] [stderr]    Compiling crc16 v0.4.0
[INFO] [stderr]    Compiling stable_deref_trait v1.2.0
[INFO] [stderr]    Compiling async-task v4.0.3
[INFO] [stderr]    Compiling unmp-id v1.4.0
[INFO] [stderr]    Compiling fixed-queue v0.3.10
[INFO] [stderr]    Compiling md5 v0.7.0
[INFO] [stderr]    Compiling unmp-id v2.0.0
[INFO] [stderr]    Compiling lock_api v0.4.4
[INFO] [stderr]    Compiling hash32 v0.2.1
[INFO] [stderr]    Compiling unmp-center-core v0.1.3
[INFO] [stderr]    Compiling spin v0.9.2
[INFO] [stderr]    Compiling futures-intrusive v0.4.0
[INFO] [stderr]    Compiling task-stream v0.3.3
[INFO] [stderr]    Compiling getrandom v0.2.3
[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" "4bc48e06dd608a30496c695cef6059770a23ba06278f275f15729506d06af779", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4bc48e06dd608a30496c695cef6059770a23ba06278f275f15729506d06af779", kill_on_drop: false }`
[INFO] [stdout] 4bc48e06dd608a30496c695cef6059770a23ba06278f275f15729506d06af779
