[INFO] fetching crate messagebus 0.15.0...
[INFO] documenting messagebus-0.15.0 against 1.75.0 for beta-1.76-rustdoc-1
[INFO] extracting crate messagebus 0.15.0 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate messagebus 0.15.0 on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate messagebus 0.15.0
[INFO] finished tweaking crates.io crate messagebus 0.15.0
[INFO] tweaked toml for crates.io crate messagebus 0.15.0 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate crates.io crate messagebus 0.15.0 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" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded windows-targets v0.48.2
[INFO] [stderr]   Downloaded kanal v0.1.0-pre8
[INFO] [stderr]   Downloaded windows_aarch64_gnullvm v0.48.2
[INFO] [stderr]   Downloaded windows_x86_64_gnu v0.48.2
[INFO] [stderr]   Downloaded windows_aarch64_msvc v0.48.2
[INFO] [stderr]   Downloaded windows_i686_msvc v0.48.2
[INFO] [stderr]   Downloaded windows_x86_64_msvc v0.48.2
[INFO] [stderr]   Downloaded windows_i686_gnu v0.48.2
[INFO] [stderr]   Downloaded windows_x86_64_gnullvm v0.48.2
[INFO] [stderr]   Downloaded boxcar v0.2.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c4f1fa71a3d0e392ca7bdd6fbc3e9f4f4bed1a291fe24e4520e19ed4de5d0da3
[INFO] running `Command { std: "docker" "start" "-a" "c4f1fa71a3d0e392ca7bdd6fbc3e9f4f4bed1a291fe24e4520e19ed4de5d0da3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c4f1fa71a3d0e392ca7bdd6fbc3e9f4f4bed1a291fe24e4520e19ed4de5d0da3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c4f1fa71a3d0e392ca7bdd6fbc3e9f4f4bed1a291fe24e4520e19ed4de5d0da3", kill_on_drop: false }`
[INFO] [stdout] c4f1fa71a3d0e392ca7bdd6fbc3e9f4f4bed1a291fe24e4520e19ed4de5d0da3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bc1120a08ebdf79a6344d72d69073713a86d1fef6ce5bada16384f7c5bfa43d4
[INFO] running `Command { std: "docker" "start" "-a" "bc1120a08ebdf79a6344d72d69073713a86d1fef6ce5bada16384f7c5bfa43d4", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.66
[INFO] [stderr]    Compiling unicode-ident v1.0.11
[INFO] [stderr]    Compiling libc v0.2.147
[INFO] [stderr]    Compiling futures-core v0.3.28
[INFO] [stderr]    Compiling slab v0.4.8
[INFO] [stderr]    Compiling futures-channel v0.3.28
[INFO] [stderr]    Compiling futures-task v0.3.28
[INFO] [stderr]    Compiling lock_api v0.4.10
[INFO] [stderr]    Compiling futures-util v0.3.28
[INFO] [stderr]     Checking futures-sink v0.3.28
[INFO] [stderr]    Compiling parking_lot_core v0.9.8
[INFO] [stderr]     Checking futures-io v0.3.28
[INFO] [stderr]    Compiling priority-queue v1.3.2
[INFO] [stderr]    Compiling anyhow v1.0.75
[INFO] [stderr]     Checking smallvec v1.11.0
[INFO] [stderr]     Checking once_cell v1.18.0
[INFO] [stderr]     Checking hashbrown v0.14.0
[INFO] [stderr]     Checking boxcar v0.2.3
[INFO] [stderr]     Checking kanal v0.1.0-pre8
[INFO] [stderr]    Compiling quote v1.0.33
[INFO] [stderr]     Checking getrandom v0.2.10
[INFO] [stderr]    Compiling syn v2.0.29
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking dashmap v5.5.0
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand_xorshift v0.3.0
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]    Compiling futures-macro v0.3.28
[INFO] [stderr]    Compiling tokio-macros v2.1.0
[INFO] [stderr]     Checking tokio v1.32.0
[INFO] [stderr]     Checking futures-executor v0.3.28
[INFO] [stderr]     Checking futures v0.3.28
[INFO] [stderr]  Documenting messagebus v0.15.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(return_position_impl_trait_in_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `return_position_impl_trait_in_trait` has been stable since `1.75.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(async_fn_in_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `async_fn_in_trait` has been stable since `1.75.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `messagebus`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/1.75.0-x86_64-unknown-linux-gnu/bin/rustdoc --edition=2021 --crate-type lib --crate-name messagebus src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=bcb6020c9f23042c -L dependency=/opt/rustwide/target/debug/deps --extern anyhow=/opt/rustwide/target/debug/deps/libanyhow-407784efe10f3351.rmeta --extern boxcar=/opt/rustwide/target/debug/deps/libboxcar-1ba0ae95db114538.rmeta --extern dashmap=/opt/rustwide/target/debug/deps/libdashmap-97d982d6c4705481.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-3519cf5ec5e63bb3.rmeta --extern kanal=/opt/rustwide/target/debug/deps/libkanal-9bffd5f23b9a69e2.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-91e42ebaf8a62e54.rmeta --extern pin_project_lite=/opt/rustwide/target/debug/deps/libpin_project_lite-a52591f63adb7509.rmeta --extern priority_queue=/opt/rustwide/target/debug/deps/libpriority_queue-6fbe9b3f171ca033.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-6ba726f4b290d8ae.rmeta --extern rand_xorshift=/opt/rustwide/target/debug/deps/librand_xorshift-77fa1725df7adb8b.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-33e3bb7da20eab79.rmeta --cap-lints=warn --crate-version 0.15.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "bc1120a08ebdf79a6344d72d69073713a86d1fef6ce5bada16384f7c5bfa43d4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bc1120a08ebdf79a6344d72d69073713a86d1fef6ce5bada16384f7c5bfa43d4", kill_on_drop: false }`
[INFO] [stdout] bc1120a08ebdf79a6344d72d69073713a86d1fef6ce5bada16384f7c5bfa43d4
