[INFO] fetching crate gemfra 0.1.0...
[INFO] documenting gemfra-0.1.0 against 1.75.0 for beta-1.76-rustdoc-1
[INFO] extracting crate gemfra 0.1.0 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate gemfra 0.1.0 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 gemfra 0.1.0
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate gemfra 0.1.0
[INFO] tweaked toml for crates.io crate gemfra 0.1.0 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate crates.io crate gemfra 0.1.0 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 tokio-stream v0.1.11
[INFO] [stderr]   Downloaded cxxbridge-macro v1.0.85
[INFO] [stderr]   Downloaded cxxbridge-flags v1.0.85
[INFO] [stderr]   Downloaded scratch v1.0.3
[INFO] [stderr]   Downloaded tokio-test v0.4.2
[INFO] [stderr]   Downloaded async-trait v0.1.60
[INFO] [stderr]   Downloaded route-recognizer v0.3.1
[INFO] [stderr]   Downloaded cxx-build v1.0.85
[INFO] [stderr]   Downloaded cxx v1.0.85
[INFO] [stderr]   Downloaded gemfra-codegen v0.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] c3f7510365fc532f1285f1f467006d46e200ce2b5d2eaed077029511781ec80a
[INFO] running `Command { std: "docker" "start" "-a" "c3f7510365fc532f1285f1f467006d46e200ce2b5d2eaed077029511781ec80a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c3f7510365fc532f1285f1f467006d46e200ce2b5d2eaed077029511781ec80a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c3f7510365fc532f1285f1f467006d46e200ce2b5d2eaed077029511781ec80a", kill_on_drop: false }`
[INFO] [stdout] c3f7510365fc532f1285f1f467006d46e200ce2b5d2eaed077029511781ec80a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 3aa48e05825a788c603304262e5d55923fedd229cac53bac6dc50af96ffebc0f
[INFO] running `Command { std: "docker" "start" "-a" "3aa48e05825a788c603304262e5d55923fedd229cac53bac6dc50af96ffebc0f", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.49
[INFO] [stderr]    Compiling libc v0.2.139
[INFO] [stderr]    Compiling unicode-ident v1.0.6
[INFO] [stderr]    Compiling quote v1.0.23
[INFO] [stderr]    Compiling syn v1.0.107
[INFO] [stderr]    Compiling tokio v1.23.0
[INFO] [stderr]    Compiling async-trait v0.1.60
[INFO] [stderr]     Checking bytes v1.3.0
[INFO] [stderr]     Checking time v0.1.45
[INFO] [stderr]     Checking chrono v0.4.23
[INFO] [stderr]  Documenting gemfra v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:29:18
[INFO] [stdout]    |
[INFO] [stdout] 29 | #![cfg_attr(doc, feature(doc_auto_cfg))]
[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 document `gemfra`
[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 gemfra src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="cgi"' --cfg 'feature="default"' --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=4f0114dca81aaeb0 -L dependency=/opt/rustwide/target/debug/deps --extern async_trait=/opt/rustwide/target/debug/deps/libasync_trait-212e580679335ee2.so --extern bytes=/opt/rustwide/target/debug/deps/libbytes-85a9e9f3fe0247d6.rmeta --extern chrono=/opt/rustwide/target/debug/deps/libchrono-c399f6550b6c2730.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-d67fdde0db96eb50.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "3aa48e05825a788c603304262e5d55923fedd229cac53bac6dc50af96ffebc0f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3aa48e05825a788c603304262e5d55923fedd229cac53bac6dc50af96ffebc0f", kill_on_drop: false }`
[INFO] [stdout] 3aa48e05825a788c603304262e5d55923fedd229cac53bac6dc50af96ffebc0f
