[INFO] fetching crate async-circe 0.2.3...
[INFO] documenting async-circe-0.2.3 against 1.76.0 for beta-1.77-rustdoc-1
[INFO] extracting crate async-circe 0.2.3 into /workspace/builds/worker-7-tc1/source
[INFO] validating manifest of crates.io crate async-circe 0.2.3 on toolchain 1.76.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.76.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate async-circe 0.2.3
[INFO] finished tweaking crates.io crate async-circe 0.2.3
[INFO] tweaked toml for crates.io crate async-circe 0.2.3 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.76.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.76.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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" "+1.76.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 77a55a6b687246d342765c03e498ae01b45865da3a057c3d4502b049d5338bde
[INFO] running `Command { std: "docker" "start" "-a" "77a55a6b687246d342765c03e498ae01b45865da3a057c3d4502b049d5338bde", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "77a55a6b687246d342765c03e498ae01b45865da3a057c3d4502b049d5338bde", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "77a55a6b687246d342765c03e498ae01b45865da3a057c3d4502b049d5338bde", kill_on_drop: false }`
[INFO] [stdout] 77a55a6b687246d342765c03e498ae01b45865da3a057c3d4502b049d5338bde
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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" "+1.76.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] be374eeab98673a4f910e55ff9b7df91bd2f74e86dd6c07e8d05cf878bc70998
[INFO] running `Command { std: "docker" "start" "-a" "be374eeab98673a4f910e55ff9b7df91bd2f74e86dd6c07e8d05cf878bc70998", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.153
[INFO] [stderr]    Compiling vcpkg v0.2.15
[INFO] [stderr]    Compiling openssl v0.10.63
[INFO] [stderr]    Compiling proc-macro2 v1.0.78
[INFO] [stderr]     Checking foreign-types-shared v0.1.1
[INFO] [stderr]    Compiling native-tls v0.2.11
[INFO] [stderr]     Checking bitflags v2.4.2
[INFO] [stderr]     Checking mio v0.8.10
[INFO] [stderr]     Checking foreign-types v0.3.2
[INFO] [stderr]     Checking socket2 v0.5.5
[INFO] [stderr]     Checking openssl-probe v0.1.5
[INFO] [stderr]     Checking tracing-core v0.1.32
[INFO] [stderr]    Compiling quote v1.0.35
[INFO] [stderr]     Checking tokio v1.36.0
[INFO] [stderr]    Compiling syn v2.0.48
[INFO] [stderr]    Compiling cc v1.0.83
[INFO] [stderr]    Compiling openssl-sys v0.9.99
[INFO] [stderr]    Compiling openssl-macros v0.1.1
[INFO] [stderr]    Compiling tracing-attributes v0.1.27
[INFO] [stderr]     Checking tracing v0.1.40
[INFO] [stderr]     Checking tokio-native-tls v0.3.1
[INFO] [stderr]  Documenting async-circe v0.2.3 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:28:1
[INFO] [stdout]    |
[INFO] [stdout] 28 | #![feature(doc_cfg)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 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 document `async-circe`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/1.76.0-x86_64-unknown-linux-gnu/bin/rustdoc --edition=2021 --crate-type lib --crate-name async_circe src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --cfg 'feature="native-tls"' --cfg 'feature="tls"' --cfg 'feature="tokio-native-tls"' --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=138e80df91e8da4c -L dependency=/opt/rustwide/target/debug/deps --extern native_tls=/opt/rustwide/target/debug/deps/libnative_tls-cf88f26ef85ab68c.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-9f0cb5dcbb4e37a6.rmeta --extern tokio_native_tls=/opt/rustwide/target/debug/deps/libtokio_native_tls-2bebe84a5bc9a61e.rmeta --extern tracing=/opt/rustwide/target/debug/deps/libtracing-ccebe927eb4b4677.rmeta --cap-lints=warn --crate-version 0.2.3` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "be374eeab98673a4f910e55ff9b7df91bd2f74e86dd6c07e8d05cf878bc70998", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "be374eeab98673a4f910e55ff9b7df91bd2f74e86dd6c07e8d05cf878bc70998", kill_on_drop: false }`
[INFO] [stdout] be374eeab98673a4f910e55ff9b7df91bd2f74e86dd6c07e8d05cf878bc70998
