[INFO] fetching crate rust-mqtt 0.1.5...
[INFO] documenting rust-mqtt-0.1.5 against beta-2023-04-20 for beta-1.70-rustdoc-1
[INFO] extracting crate rust-mqtt 0.1.5 into /workspace/builds/worker-5-tc2/source
[INFO] validating manifest of crates.io crate rust-mqtt 0.1.5 on toolchain beta-2023-04-20
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2023-04-20" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-5-tc2/source/rust-toolchain.toml
[INFO] started tweaking crates.io crate rust-mqtt 0.1.5
[INFO] finished tweaking crates.io crate rust-mqtt 0.1.5
[INFO] tweaked toml for crates.io crate rust-mqtt 0.1.5 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] crate crates.io crate rust-mqtt 0.1.5 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2023-04-20" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded defmt-macros v0.3.3
[INFO] [stderr]   Downloaded embedded-io v0.4.0
[INFO] [stderr]   Downloaded serial_test v0.6.0
[INFO] [stderr]   Downloaded defmt-parser v0.3.1
[INFO] [stderr]   Downloaded serial_test_derive v0.6.0
[INFO] [stderr]   Downloaded defmt v0.3.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-04-20" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 56e153564c1552f318593eda44b6d51cab042b1694fa85a008d5b93b39f60e8f
[INFO] running `Command { std: "docker" "start" "-a" "56e153564c1552f318593eda44b6d51cab042b1694fa85a008d5b93b39f60e8f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "56e153564c1552f318593eda44b6d51cab042b1694fa85a008d5b93b39f60e8f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "56e153564c1552f318593eda44b6d51cab042b1694fa85a008d5b93b39f60e8f", kill_on_drop: false }`
[INFO] [stdout] 56e153564c1552f318593eda44b6d51cab042b1694fa85a008d5b93b39f60e8f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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" "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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-04-20" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5d1f1599f4e4cdc244f5fb91c50da4798a5cd486a0b8ef00e36cc88377653ca1
[INFO] running `Command { std: "docker" "start" "-a" "5d1f1599f4e4cdc244f5fb91c50da4798a5cd486a0b8ef00e36cc88377653ca1", kill_on_drop: false }`
[INFO] [stderr]     Checking stable_deref_trait v1.2.0
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking embedded-io v0.4.0
[INFO] [stderr]     Checking hash32 v0.2.1
[INFO] [stderr]    Compiling rustc_version v0.4.0
[INFO] [stderr]     Checking spin v0.9.4
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/embedded-io-0.4.0/src/lib.rs:2:32
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![cfg_attr(feature = "async", feature(async_fn_in_trait, impl_trait_projections))]
[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 `embedded-io` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "5d1f1599f4e4cdc244f5fb91c50da4798a5cd486a0b8ef00e36cc88377653ca1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5d1f1599f4e4cdc244f5fb91c50da4798a5cd486a0b8ef00e36cc88377653ca1", kill_on_drop: false }`
[INFO] [stdout] 5d1f1599f4e4cdc244f5fb91c50da4798a5cd486a0b8ef00e36cc88377653ca1
