[INFO] fetching crate submetadatan 0.5.1...
[INFO] testing submetadatan-0.5.1 against beta-2021-09-08 for beta-1.56-1
[INFO] extracting crate submetadatan 0.5.1 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate submetadatan 0.5.1 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 submetadatan 0.5.1
[INFO] finished tweaking crates.io crate submetadatan 0.5.1
[INFO] tweaked toml for crates.io crate submetadatan 0.5.1 written to /workspace/builds/worker-8/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] [stderr]     Blocking waiting for file lock on package cache
[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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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] b92498e76d72fe583c4ee2f385f4ad3f04b0d8b6f1f42283dc9a47636ecb8437
[INFO] running `Command { std: "docker" "start" "-a" "b92498e76d72fe583c4ee2f385f4ad3f04b0d8b6f1f42283dc9a47636ecb8437", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b92498e76d72fe583c4ee2f385f4ad3f04b0d8b6f1f42283dc9a47636ecb8437", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b92498e76d72fe583c4ee2f385f4ad3f04b0d8b6f1f42283dc9a47636ecb8437", kill_on_drop: false }`
[INFO] [stdout] b92498e76d72fe583c4ee2f385f4ad3f04b0d8b6f1f42283dc9a47636ecb8437
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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] 94a48e7648ca10078bc832c013737d34a79556974513ee612431faede1788063
[INFO] running `Command { std: "docker" "start" "-a" "94a48e7648ca10078bc832c013737d34a79556974513ee612431faede1788063", kill_on_drop: false }`
[INFO] [stderr]    Compiling crunchy v0.2.2
[INFO] [stderr]    Compiling array-bytes v1.3.3
[INFO] [stderr]    Compiling generic-array v0.14.4
[INFO] [stderr]    Compiling arrayvec v0.4.12
[INFO] [stderr]    Compiling tiny-keccak v2.0.2
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling blake2-rfc v0.2.18
[INFO] [stderr]    Compiling rand v0.8.4
[INFO] [stderr]    Compiling digest v0.9.0
[INFO] [stderr]    Compiling block-buffer v0.9.0
[INFO] [stderr]    Compiling twox-hash v1.6.1
[INFO] [stderr]    Compiling sha2 v0.9.8
[INFO] [stderr]    Compiling subhasher v0.1.7
[INFO] [stderr]    Compiling substorager v0.3.0
[INFO] [stderr]    Compiling submetadatan v0.5.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(arbitrary_enum_discriminant)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `arbitrary_enum_discriminant` has been stable since 1.56.0 and no longer requires an attribute to enable
[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 `submetadatan` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "94a48e7648ca10078bc832c013737d34a79556974513ee612431faede1788063", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "94a48e7648ca10078bc832c013737d34a79556974513ee612431faede1788063", kill_on_drop: false }`
[INFO] [stdout] 94a48e7648ca10078bc832c013737d34a79556974513ee612431faede1788063