[INFO] fetching crate embedded-executor 0.6.1...
[INFO] documenting embedded-executor-0.6.1 against beta-2021-08-01 for beta-1.55-rustdoc-1
[INFO] extracting crate embedded-executor 0.6.1 into /workspace/builds/worker-54/source
[INFO] validating manifest of crates.io crate embedded-executor 0.6.1 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 embedded-executor 0.6.1
[INFO] finished tweaking crates.io crate embedded-executor 0.6.1
[INFO] tweaked toml for crates.io crate embedded-executor 0.6.1 written to /workspace/builds/worker-54/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] [stderr]     Blocking waiting for file lock on package cache
[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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/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] 99e5f27755dd0d1f4a3c5c9746def69247af043fd08ee2453bdc02e94a38dc88
[INFO] running `Command { std: "docker" "start" "-a" "99e5f27755dd0d1f4a3c5c9746def69247af043fd08ee2453bdc02e94a38dc88", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "99e5f27755dd0d1f4a3c5c9746def69247af043fd08ee2453bdc02e94a38dc88", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "99e5f27755dd0d1f4a3c5c9746def69247af043fd08ee2453bdc02e94a38dc88", kill_on_drop: false }`
[INFO] [stdout] 99e5f27755dd0d1f4a3c5c9746def69247af043fd08ee2453bdc02e94a38dc88
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/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" "RUSTDOCFLAGS=--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" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2e8cfb6e3bc576ca8aa3687a4f3b6645103d9a89203af6b31b7fafd7bfe1a162
[INFO] running `Command { std: "docker" "start" "-a" "2e8cfb6e3bc576ca8aa3687a4f3b6645103d9a89203af6b31b7fafd7bfe1a162", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling futures-core v0.3.16
[INFO] [stderr]    Compiling futures-channel v0.3.16
[INFO] [stderr]     Checking futures-sink v0.3.16
[INFO] [stderr]     Checking futures-io v0.3.16
[INFO] [stderr]     Checking alloc-facade v0.5.0
[INFO] [stderr]    Compiling futures-util v0.3.16
[INFO] [stderr]     Checking generational-arena v0.2.8
[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/generational-arena-0.2.8/src/lib.rs:146:35
[INFO] [stdout]     |
[INFO] [stdout] 146 | #![cfg_attr(not(feature = "std"), feature(alloc))]
[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 `generational-arena` 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" "2e8cfb6e3bc576ca8aa3687a4f3b6645103d9a89203af6b31b7fafd7bfe1a162", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2e8cfb6e3bc576ca8aa3687a4f3b6645103d9a89203af6b31b7fafd7bfe1a162", kill_on_drop: false }`
[INFO] [stdout] 2e8cfb6e3bc576ca8aa3687a4f3b6645103d9a89203af6b31b7fafd7bfe1a162
