[INFO] fetching crate rafka 0.1.0...
[INFO] testing rafka-0.1.0 against beta-2021-09-08 for beta-1.56-1
[INFO] extracting crate rafka 0.1.0 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate rafka 0.1.0 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 rafka 0.1.0
[INFO] finished tweaking crates.io crate rafka 0.1.0
[INFO] tweaked toml for crates.io crate rafka 0.1.0 written to /workspace/builds/worker-12/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]  Downloading crates ...
[INFO] [stderr]   Downloaded tower-load-shed v0.3.0
[INFO] [stderr]   Downloaded tower-retry v0.3.0
[INFO] [stderr]   Downloaded crossbeam v0.7.3
[INFO] [stderr]   Downloaded tower-util v0.3.1
[INFO] [stderr]   Downloaded crossbeam-channel v0.4.4
[INFO] [stderr]   Downloaded tower-layer v0.3.1
[INFO] [stderr]   Downloaded tower-timeout v0.3.0
[INFO] [stderr]   Downloaded rafka_codegen v0.0.0
[INFO] [stderr]   Downloaded tower-load v0.3.0
[INFO] [stderr]   Downloaded tower-limit v0.3.1
[INFO] [stderr]   Downloaded tower-discover v0.3.0
[INFO] [stderr]   Downloaded tower-buffer v0.3.0
[INFO] [stderr]   Downloaded tower v0.3.1
[INFO] [stderr]   Downloaded tokio-tower v0.4.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] 393da9d048a2454d88ea60f3f16c6da32cc080d9b9ae09d78ae917195a5be671
[INFO] running `Command { std: "docker" "start" "-a" "393da9d048a2454d88ea60f3f16c6da32cc080d9b9ae09d78ae917195a5be671", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "393da9d048a2454d88ea60f3f16c6da32cc080d9b9ae09d78ae917195a5be671", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "393da9d048a2454d88ea60f3f16c6da32cc080d9b9ae09d78ae917195a5be671", kill_on_drop: false }`
[INFO] [stdout] 393da9d048a2454d88ea60f3f16c6da32cc080d9b9ae09d78ae917195a5be671
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] 4e7a03a52ab7acd3913cc4868fb38a9acbb82862a65014ce42827dd98fafeab8
[INFO] running `Command { std: "docker" "start" "-a" "4e7a03a52ab7acd3913cc4868fb38a9acbb82862a65014ce42827dd98fafeab8", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling pin-project-internal v0.4.28
[INFO] [stderr]    Compiling tower-layer v0.3.1
[INFO] [stderr]    Compiling crossbeam-channel v0.4.4
[INFO] [stderr]    Compiling tokio-macros v0.2.6
[INFO] [stderr]    Compiling tracing-attributes v0.1.15
[INFO] [stderr]    Compiling rustls v0.18.1
[INFO] [stderr]    Compiling rafka_codegen v0.0.0
[INFO] [stderr]    Compiling futures-util v0.3.17
[INFO] [stderr]    Compiling crossbeam v0.7.3
[INFO] [stderr]    Compiling tracing v0.1.26
[INFO] [stderr]    Compiling tokio v0.2.25
[INFO] [stderr]    Compiling pin-project v0.4.28
[INFO] [stderr]    Compiling tower-discover v0.3.0
[INFO] [stderr]    Compiling tower-load-shed v0.3.0
[INFO] [stderr]    Compiling futures-executor v0.3.17
[INFO] [stderr]    Compiling tower-util v0.3.1
[INFO] [stderr]    Compiling futures v0.3.17
[INFO] [stderr]    Compiling tower-load v0.3.0
[INFO] [stderr]    Compiling tower-buffer v0.3.0
[INFO] [stderr]    Compiling tower-timeout v0.3.0
[INFO] [stderr]    Compiling tower-retry v0.3.0
[INFO] [stderr]    Compiling tokio-util v0.3.1
[INFO] [stderr]    Compiling tokio-rustls v0.14.1
[INFO] [stderr]    Compiling tower-limit v0.3.1
[INFO] [stderr]    Compiling tokio-tower v0.4.0
[INFO] [stderr]    Compiling tower v0.3.1
[INFO] [stderr]    Compiling rafka v0.1.0 (/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(min_const_generics)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `min_const_generics` has been stable since 1.51.0 and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rafka` due to 2 previous errors
[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] running `Command { std: "docker" "inspect" "4e7a03a52ab7acd3913cc4868fb38a9acbb82862a65014ce42827dd98fafeab8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4e7a03a52ab7acd3913cc4868fb38a9acbb82862a65014ce42827dd98fafeab8", kill_on_drop: false }`
[INFO] [stdout] 4e7a03a52ab7acd3913cc4868fb38a9acbb82862a65014ce42827dd98fafeab8