[INFO] fetching crate alox-48 0.4.1...
[INFO] documenting alox-48-0.4.1 against 1.76.0 for beta-1.77-rustdoc-1
[INFO] extracting crate alox-48 0.4.1 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate alox-48 0.4.1 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 alox-48 0.4.1
[INFO] finished tweaking crates.io crate alox-48 0.4.1
[INFO] tweaked toml for crates.io crate alox-48 0.4.1 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate crates.io crate alox-48 0.4.1 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" "+1.76.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded thiserror v1.0.44
[INFO] [stderr]   Downloaded supports-hyperlinks v2.1.0
[INFO] [stderr]   Downloaded miette v5.10.0
[INFO] [stderr]   Downloaded pretty-hex v0.3.0
[INFO] [stderr]   Downloaded hermit-abi v0.3.2
[INFO] [stderr]   Downloaded supports-unicode v2.0.0
[INFO] [stderr]   Downloaded indenter v0.3.3
[INFO] [stderr]   Downloaded is_ci v1.1.1
[INFO] [stderr]   Downloaded thread_local v1.1.7
[INFO] [stderr]   Downloaded supports-color v2.0.0
[INFO] [stderr]   Downloaded is-terminal v0.4.9
[INFO] [stderr]   Downloaded unicode-linebreak v0.1.5
[INFO] [stderr]   Downloaded unicode-ident v1.0.11
[INFO] [stderr]   Downloaded quote v1.0.32
[INFO] [stderr]   Downloaded miniz_oxide v0.7.1
[INFO] [stderr]   Downloaded bytemuck v1.13.1
[INFO] [stderr]   Downloaded syn v2.0.27
[INFO] [stderr]   Downloaded linux-raw-sys v0.4.3
[INFO] [stderr]   Downloaded color-eyre v0.6.2
[INFO] [stderr]   Downloaded libc v0.2.147
[INFO] [stderr]   Downloaded tracing-subscriber v0.3.17
[INFO] [stderr]   Downloaded gimli v0.27.3
[INFO] [stderr]   Downloaded object v0.31.1
[INFO] [stderr]   Downloaded rustix v0.38.4
[INFO] [stderr]   Downloaded serde_derive v1.0.176
[INFO] [stderr]   Downloaded color-spantrace v0.2.0
[INFO] [stderr]   Downloaded hashbrown v0.14.0
[INFO] [stderr]   Downloaded indexmap v2.0.0
[INFO] [stderr]   Downloaded backtrace v0.3.68
[INFO] [stderr]   Downloaded miette-derive v5.10.0
[INFO] [stderr]   Downloaded owo-colors v3.5.0
[INFO] [stderr]   Downloaded tracing-error v0.2.0
[INFO] [stderr]   Downloaded textwrap v0.15.2
[INFO] [stderr]   Downloaded proc-macro2 v1.0.66
[INFO] [stderr]   Downloaded bitflags v2.3.3
[INFO] [stderr]   Downloaded paste v1.0.14
[INFO] [stderr]   Downloaded eyre v0.6.8
[INFO] [stderr]   Downloaded once_cell v1.18.0
[INFO] [stderr]   Downloaded unicode-width v0.1.10
[INFO] [stderr]   Downloaded enum-as-inner v0.6.0
[INFO] [stderr]   Downloaded pin-project-lite v0.2.10
[INFO] [stderr]   Downloaded smawk v0.3.1
[INFO] [stderr]   Downloaded backtrace-ext v0.2.1
[INFO] [stderr]   Downloaded windows-targets v0.48.1
[INFO] [stderr]   Downloaded addr2line v0.20.0
[INFO] [stderr]   Downloaded serde v1.0.176
[INFO] [stderr]   Downloaded thiserror-impl v1.0.44
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] fbf30ae1d5ba521f49e9d26e64c26200c443c1cfde08a237e37c12a42ff4a0de
[INFO] running `Command { std: "docker" "start" "-a" "fbf30ae1d5ba521f49e9d26e64c26200c443c1cfde08a237e37c12a42ff4a0de", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fbf30ae1d5ba521f49e9d26e64c26200c443c1cfde08a237e37c12a42ff4a0de", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fbf30ae1d5ba521f49e9d26e64c26200c443c1cfde08a237e37c12a42ff4a0de", kill_on_drop: false }`
[INFO] [stdout] fbf30ae1d5ba521f49e9d26e64c26200c443c1cfde08a237e37c12a42ff4a0de
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 873002c7e84e996899f11eacb4adc8e83391592ba41071437f84130ccd258e20
[INFO] running `Command { std: "docker" "start" "-a" "873002c7e84e996899f11eacb4adc8e83391592ba41071437f84130ccd258e20", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.66
[INFO] [stderr]    Compiling unicode-ident v1.0.11
[INFO] [stderr]    Compiling thiserror v1.0.44
[INFO] [stderr]    Compiling serde v1.0.176
[INFO] [stderr]    Compiling serde_derive v1.0.176
[INFO] [stderr]    Compiling paste v1.0.14
[INFO] [stderr]     Checking unicode-width v0.1.10
[INFO] [stderr]    Compiling heck v0.4.1
[INFO] [stderr]     Checking hashbrown v0.14.0
[INFO] [stderr]     Checking once_cell v1.18.0
[INFO] [stderr]    Compiling quote v1.0.32
[INFO] [stderr]    Compiling syn v2.0.27
[INFO] [stderr]    Compiling thiserror-impl v1.0.44
[INFO] [stderr]    Compiling miette-derive v5.10.0
[INFO] [stderr]    Compiling enum-as-inner v0.6.0
[INFO] [stderr]     Checking indexmap v2.0.0
[INFO] [stderr]     Checking miette v5.10.0
[INFO] [stderr]  Documenting alox-48 v0.4.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:12:1
[INFO] [stdout]    |
[INFO] [stdout] 12 | #![feature(min_specialization)]
[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 `alox-48`
[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 alox_48 src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --cfg 'feature="warn-encoding"' --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=2793efec7a4503fe -L dependency=/opt/rustwide/target/debug/deps --extern enum_as_inner=/opt/rustwide/target/debug/deps/libenum_as_inner-23a377960cd82414.so --extern indexmap=/opt/rustwide/target/debug/deps/libindexmap-ffd194f412ec1971.rmeta --extern miette=/opt/rustwide/target/debug/deps/libmiette-ffe55ebd4bff2ece.rmeta --extern paste=/opt/rustwide/target/debug/deps/libpaste-05e44ee96a978324.so --extern serde=/opt/rustwide/target/debug/deps/libserde-3d9b6e76e31d4c77.rmeta --extern thiserror=/opt/rustwide/target/debug/deps/libthiserror-f8bc9adff5fa17e1.rmeta --cap-lints=warn --crate-version 0.4.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "873002c7e84e996899f11eacb4adc8e83391592ba41071437f84130ccd258e20", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "873002c7e84e996899f11eacb4adc8e83391592ba41071437f84130ccd258e20", kill_on_drop: false }`
[INFO] [stdout] 873002c7e84e996899f11eacb4adc8e83391592ba41071437f84130ccd258e20
