[INFO] fetching crate embedded-executor 0.6.1...
[INFO] documenting embedded-executor-0.6.1 against beta-2022-05-20 for beta-1.62-rustdoc-1
[INFO] extracting crate embedded-executor 0.6.1 into /workspace/builds/worker-107/source
[INFO] validating manifest of crates.io crate embedded-executor 0.6.1 on toolchain beta-2022-05-20
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-05-20" "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-107/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-05-20" "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-2022-05-20" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-107/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-107/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-05-20" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 91a3a54baa08dad3e08dca68c4e19e9f5e1fc7e59c9b869b7ef6f5a73b7bbf16
[INFO] running `Command { std: "docker" "start" "-a" "91a3a54baa08dad3e08dca68c4e19e9f5e1fc7e59c9b869b7ef6f5a73b7bbf16", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "91a3a54baa08dad3e08dca68c4e19e9f5e1fc7e59c9b869b7ef6f5a73b7bbf16", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "91a3a54baa08dad3e08dca68c4e19e9f5e1fc7e59c9b869b7ef6f5a73b7bbf16", kill_on_drop: false }`
[INFO] [stdout] 91a3a54baa08dad3e08dca68c4e19e9f5e1fc7e59c9b869b7ef6f5a73b7bbf16
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-107/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-107/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-05-20" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 66e8ef36a73b7d4e5f98f27b1118d5b9ff525e1540cd2473b999b7bd503a2128
[INFO] running `Command { std: "docker" "start" "-a" "66e8ef36a73b7d4e5f98f27b1118d5b9ff525e1540cd2473b999b7bd503a2128", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling futures-core v0.3.21
[INFO] [stderr]    Compiling futures-task v0.3.21
[INFO] [stderr]     Checking futures-sink v0.3.21
[INFO] [stderr]    Compiling futures-channel v0.3.21
[INFO] [stderr]    Compiling futures-util v0.3.21
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]     Checking pin-utils v0.1.0
[INFO] [stderr]     Checking pin-project-lite v0.2.9
[INFO] [stderr]     Checking futures-io v0.3.21
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]     Checking alloc-facade v0.5.0
[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:146:43
[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] running `Command { std: "docker" "inspect" "66e8ef36a73b7d4e5f98f27b1118d5b9ff525e1540cd2473b999b7bd503a2128", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "66e8ef36a73b7d4e5f98f27b1118d5b9ff525e1540cd2473b999b7bd503a2128", kill_on_drop: false }`
[INFO] [stdout] 66e8ef36a73b7d4e5f98f27b1118d5b9ff525e1540cd2473b999b7bd503a2128