[INFO] fetching crate facade 0.0.0...
[INFO] testing facade-0.0.0 against beta-2021-09-08 for beta-1.56-1
[INFO] extracting crate facade 0.0.0 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate facade 0.0.0 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 facade 0.0.0
[INFO] finished tweaking crates.io crate facade 0.0.0
[INFO] tweaked toml for crates.io crate facade 0.0.0 written to /workspace/builds/worker-10/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 futures-join-macro-preview v0.3.0-alpha.18
[INFO] [stderr]   Downloaded futures-select-macro-preview v0.3.0-alpha.18
[INFO] [stderr]   Downloaded facade-protocol v0.1.0
[INFO] [stderr]   Downloaded futures-timer v0.2.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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] d00b1f309c5bf32d0dc5ad2b1ffec95ff5104347ae6e95dbd95598279a785e94
[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" "d00b1f309c5bf32d0dc5ad2b1ffec95ff5104347ae6e95dbd95598279a785e94", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d00b1f309c5bf32d0dc5ad2b1ffec95ff5104347ae6e95dbd95598279a785e94", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d00b1f309c5bf32d0dc5ad2b1ffec95ff5104347ae6e95dbd95598279a785e94", kill_on_drop: false }`
[INFO] [stdout] d00b1f309c5bf32d0dc5ad2b1ffec95ff5104347ae6e95dbd95598279a785e94
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 042914d416ecd392a863cfc510170dff924f12076c1a9c2ff6bc24adefa7daca
[INFO] running `Command { std: "docker" "start" "-a" "042914d416ecd392a863cfc510170dff924f12076c1a9c2ff6bc24adefa7daca", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling futures-core-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling futures-io-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling base64 v0.11.0
[INFO] [stderr]    Compiling rust-ini v0.13.0
[INFO] [stderr]    Compiling num-bigint v0.2.6
[INFO] [stderr]    Compiling serde_test v0.8.23
[INFO] [stderr]    Compiling want v0.2.0
[INFO] [stderr]    Compiling filetime v0.2.15
[INFO] [stderr]    Compiling xattr v0.2.2
[INFO] [stderr]    Compiling twoway v0.1.8
[INFO] [stderr]    Compiling object v0.26.2
[INFO] [stderr]    Compiling buf_redux v0.8.4
[INFO] [stderr]    Compiling nom v4.2.3
[INFO] [stderr]    Compiling block-buffer v0.7.3
[INFO] [stderr]    Compiling tokio-io v0.1.13
[INFO] [stderr]    Compiling input_buffer v0.2.0
[INFO] [stderr]    Compiling serde_urlencoded v0.6.1
[INFO] [stderr]    Compiling sha-1 v0.8.2
[INFO] [stderr]    Compiling headers-core v0.1.1
[INFO] [stderr]    Compiling tar v0.4.37
[INFO] [stderr]    Compiling futures-sink-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling multipart v0.16.1
[INFO] [stderr]    Compiling headers v0.2.3
[INFO] [stderr]    Compiling tungstenite v0.9.2
[INFO] [stderr]    Compiling linked-hash-map v0.3.0
[INFO] [stderr]    Compiling futures-channel-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling tokio-reactor v0.1.12
[INFO] [stderr]    Compiling tokio-codec v0.1.2
[INFO] [stderr]    Compiling tokio-fs v0.1.7
[INFO] [stderr]    Compiling h2 v0.1.26
[INFO] [stderr]    Compiling serde-hjson v0.8.2
[INFO] [stderr]    Compiling tokio-tcp v0.1.4
[INFO] [stderr]    Compiling tokio-uds v0.2.7
[INFO] [stderr]    Compiling tokio-udp v0.1.6
[INFO] [stderr]    Compiling tokio v0.1.22
[INFO] [stderr]    Compiling config v0.9.3
[INFO] [stderr]    Compiling bigdecimal v0.1.2
[INFO] [stderr]    Compiling facade-protocol v0.1.0
[INFO] [stderr]    Compiling hyper v0.12.36
[INFO] [stderr]    Compiling backtrace v0.3.61
[INFO] [stderr]    Compiling futures-join-macro-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling futures-select-macro-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling failure v0.1.8
[INFO] [stderr]    Compiling warp v0.1.23
[INFO] [stderr]    Compiling futures-util-preview v0.3.0-alpha.18
[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/futures-util-preview-0.3.0-alpha.18/src/lib.rs:4:38
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![cfg_attr(feature = "async-await", feature(async_await))]
[INFO] [stdout]   |                                      ^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `async_await` has been stable since 1.39.0 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 `futures-util-preview` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "042914d416ecd392a863cfc510170dff924f12076c1a9c2ff6bc24adefa7daca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "042914d416ecd392a863cfc510170dff924f12076c1a9c2ff6bc24adefa7daca", kill_on_drop: false }`
[INFO] [stdout] 042914d416ecd392a863cfc510170dff924f12076c1a9c2ff6bc24adefa7daca