[INFO] fetching crate nightfall 0.1.8...
[INFO] documenting nightfall-0.1.8 against 1.76.0 for beta-1.77-rustdoc-1
[INFO] extracting crate nightfall 0.1.8 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate nightfall 0.1.8 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 nightfall 0.1.8
[INFO] finished tweaking crates.io crate nightfall 0.1.8
[INFO] tweaked toml for crates.io crate nightfall 0.1.8 written to /workspace/builds/worker-6-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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded unescape v0.1.0
[INFO] [stderr]   Downloaded mach2 v0.4.2
[INFO] [stderr]   Downloaded err-derive v0.3.1
[INFO] [stderr]   Downloaded psutil v3.3.0
[INFO] [stderr]   Downloaded barrage v0.2.3
[INFO] [stderr]   Downloaded platforms v2.0.0
[INFO] [stderr]   Downloaded darwin-libproc v0.1.2
[INFO] [stderr]   Downloaded darwin-libproc-sys v0.1.2
[INFO] [stderr]   Downloaded xtra_proc v0.1.0
[INFO] [stderr]   Downloaded catty v0.1.5
[INFO] [stderr]   Downloaded xtra v0.5.2
[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" "+1.76.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c5c1c9866beeaf690bd814246b15ecd69e7bbb05c1bb0a499adf6be5de8a4342
[INFO] running `Command { std: "docker" "start" "-a" "c5c1c9866beeaf690bd814246b15ecd69e7bbb05c1bb0a499adf6be5de8a4342", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c5c1c9866beeaf690bd814246b15ecd69e7bbb05c1bb0a499adf6be5de8a4342", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c5c1c9866beeaf690bd814246b15ecd69e7bbb05c1bb0a499adf6be5de8a4342", kill_on_drop: false }`
[INFO] [stdout] c5c1c9866beeaf690bd814246b15ecd69e7bbb05c1bb0a499adf6be5de8a4342
[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" "+1.76.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2577fc64ffa707cfbf5a36799f853ce5943d51d30a769e1301386921c088ce99
[INFO] running `Command { std: "docker" "start" "-a" "2577fc64ffa707cfbf5a36799f853ce5943d51d30a769e1301386921c088ce99", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.78
[INFO] [stderr]    Compiling unicode-ident v1.0.12
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling libc v0.2.153
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling version_check v0.9.4
[INFO] [stderr]     Checking scopeguard v1.2.0
[INFO] [stderr]    Compiling rustversion v1.0.14
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking pin-project-lite v0.2.13
[INFO] [stderr]     Checking futures-core v0.3.30
[INFO] [stderr]     Checking cache-padded v1.3.0
[INFO] [stderr]    Compiling async-trait v0.1.77
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling lock_api v0.4.11
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]     Checking futures-sink v0.3.30
[INFO] [stderr]    Compiling platforms v2.0.0
[INFO] [stderr]    Compiling serde v1.0.196
[INFO] [stderr]    Compiling thiserror v1.0.57
[INFO] [stderr]    Compiling quote v1.0.35
[INFO] [stderr]     Checking spin v0.9.8
[INFO] [stderr]     Checking concurrent-queue v1.2.4
[INFO] [stderr]     Checking futures-task v0.3.30
[INFO] [stderr]    Compiling unicode-xid v0.2.4
[INFO] [stderr]    Compiling syn v2.0.48
[INFO] [stderr]     Checking event-listener v2.5.3
[INFO] [stderr]    Compiling slog v2.7.0
[INFO] [stderr]     Checking bytes v1.5.0
[INFO] [stderr]    Compiling serde_json v1.0.113
[INFO] [stderr]    Compiling err-derive v0.3.1
[INFO] [stderr]     Checking pin-utils v0.1.0
[INFO] [stderr]     Checking futures-util v0.3.30
[INFO] [stderr]     Checking barrage v0.2.3
[INFO] [stderr]     Checking catty v0.1.5
[INFO] [stderr]     Checking itoa v1.0.10
[INFO] [stderr]     Checking futures-timer v3.0.2
[INFO] [stderr]     Checking pollster v0.2.5
[INFO] [stderr]     Checking ryu v1.0.16
[INFO] [stderr]     Checking once_cell v1.19.0
[INFO] [stderr]     Checking unescape v0.1.0
[INFO] [stderr]     Checking glob v0.3.1
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking signal-hook-registry v1.4.1
[INFO] [stderr]     Checking mio v0.8.10
[INFO] [stderr]     Checking getrandom v0.2.12
[INFO] [stderr]     Checking nix v0.24.3
[INFO] [stderr]     Checking num_cpus v1.16.0
[INFO] [stderr]     Checking nix v0.20.2
[INFO] [stderr]     Checking uuid v0.8.2
[INFO] [stderr]    Compiling synstructure v0.12.6
[INFO] [stderr]    Compiling pin-project-internal v1.1.4
[INFO] [stderr]    Compiling serde_derive v1.0.196
[INFO] [stderr]    Compiling tokio-macros v2.2.0
[INFO] [stderr]    Compiling thiserror-impl v1.0.57
[INFO] [stderr]    Compiling derive_more v0.99.17
[INFO] [stderr]    Compiling xtra_proc v0.1.0
[INFO] [stderr]     Checking tokio v1.36.0
[INFO] [stderr]     Checking pin-project v1.1.4
[INFO] [stderr]     Checking flume v0.10.14
[INFO] [stderr]     Checking xtra v0.5.2
[INFO] [stderr]     Checking psutil v3.3.0
[INFO] [stderr]     Checking tokio-stream v0.1.14
[INFO] [stderr]  Documenting nightfall v0.1.8 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(assert_matches, result_flattening, hash_drain_filter)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:28
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(assert_matches, result_flattening, hash_drain_filter)]
[INFO] [stdout]   |                            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:47
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(assert_matches, result_flattening, hash_drain_filter)]
[INFO] [stdout]   |                                               ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0635]: unknown feature `hash_drain_filter`
[INFO] [stdout]  --> src/lib.rs:2:47
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(assert_matches, result_flattening, hash_drain_filter)]
[INFO] [stdout]   |                                               ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0635.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `nightfall`
[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=2018 --crate-type lib --crate-name nightfall src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=9c28706156c1a4b6 -L dependency=/opt/rustwide/target/debug/deps --extern async_trait=/opt/rustwide/target/debug/deps/libasync_trait-b4e796ab0fd396b0.so --extern cfg_if=/opt/rustwide/target/debug/deps/libcfg_if-b2566a54442c411f.rmeta --extern err_derive=/opt/rustwide/target/debug/deps/liberr_derive-1b70ab1643f1d408.so --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-900704033b235124.rmeta --extern nix=/opt/rustwide/target/debug/deps/libnix-efaf32d3b87f3b50.rmeta --extern psutil=/opt/rustwide/target/debug/deps/libpsutil-20368986e1c14b98.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-b5ec5a2d66b022c1.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-e41c5f9e6d365988.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-d94852ae35849936.rmeta --extern slog=/opt/rustwide/target/debug/deps/libslog-c8f18fc72194bbdf.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-f4d1a48f150f15a9.rmeta --extern tokio_stream=/opt/rustwide/target/debug/deps/libtokio_stream-cdf57ff331acf16e.rmeta --extern uuid=/opt/rustwide/target/debug/deps/libuuid-e819f0cbf624a399.rmeta --extern xtra=/opt/rustwide/target/debug/deps/libxtra-cb47e8a9133cc8ee.rmeta --extern xtra_proc=/opt/rustwide/target/debug/deps/libxtra_proc-77d7af29a3352f3e.so --cap-lints=warn --crate-version 0.1.8` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "2577fc64ffa707cfbf5a36799f853ce5943d51d30a769e1301386921c088ce99", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2577fc64ffa707cfbf5a36799f853ce5943d51d30a769e1301386921c088ce99", kill_on_drop: false }`
[INFO] [stdout] 2577fc64ffa707cfbf5a36799f853ce5943d51d30a769e1301386921c088ce99
[INFO] documenting nightfall-0.1.8 against beta-2024-02-10 for beta-1.77-rustdoc-1
[INFO] extracting crate nightfall 0.1.8 into /workspace/builds/worker-6-tc2/source
[INFO] validating manifest of crates.io crate nightfall 0.1.8 on toolchain beta-2024-02-10
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2024-02-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate nightfall 0.1.8
[INFO] finished tweaking crates.io crate nightfall 0.1.8
[INFO] tweaked toml for crates.io crate nightfall 0.1.8 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2024-02-10" "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" "+beta-2024-02-10" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2024-02-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 74463c77a81f90048a20e348b2841440c58b14fe880f99097f27febd02eb8d08
[INFO] running `Command { std: "docker" "start" "-a" "74463c77a81f90048a20e348b2841440c58b14fe880f99097f27febd02eb8d08", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "74463c77a81f90048a20e348b2841440c58b14fe880f99097f27febd02eb8d08", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "74463c77a81f90048a20e348b2841440c58b14fe880f99097f27febd02eb8d08", kill_on_drop: false }`
[INFO] [stdout] 74463c77a81f90048a20e348b2841440c58b14fe880f99097f27febd02eb8d08
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2024-02-10" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 317b2df4ca9a7522d9dd0373f2a00f5fc68424d9552fa7d1e1ba7c7486cc6aca
[INFO] running `Command { std: "docker" "start" "-a" "317b2df4ca9a7522d9dd0373f2a00f5fc68424d9552fa7d1e1ba7c7486cc6aca", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.78
[INFO] [stderr]    Compiling unicode-ident v1.0.12
[INFO] [stderr]    Compiling libc v0.2.153
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling version_check v0.9.4
[INFO] [stderr]     Checking scopeguard v1.2.0
[INFO] [stderr]    Compiling rustversion v1.0.14
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]     Checking pin-project-lite v0.2.13
[INFO] [stderr]     Checking futures-core v0.3.30
[INFO] [stderr]    Compiling platforms v2.0.0
[INFO] [stderr]    Compiling lock_api v0.4.11
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]     Checking cache-padded v1.3.0
[INFO] [stderr]    Compiling thiserror v1.0.57
[INFO] [stderr]    Compiling async-trait v0.1.77
[INFO] [stderr]    Compiling serde v1.0.196
[INFO] [stderr]     Checking futures-sink v0.3.30
[INFO] [stderr]    Compiling quote v1.0.35
[INFO] [stderr]     Checking spin v0.9.8
[INFO] [stderr]     Checking concurrent-queue v1.2.4
[INFO] [stderr]    Compiling slog v2.7.0
[INFO] [stderr]    Compiling serde_json v1.0.113
[INFO] [stderr]    Compiling unicode-xid v0.2.4
[INFO] [stderr]    Compiling syn v2.0.48
[INFO] [stderr]     Checking bytes v1.5.0
[INFO] [stderr]     Checking event-listener v2.5.3
[INFO] [stderr]     Checking futures-task v0.3.30
[INFO] [stderr]     Checking pin-utils v0.1.0
[INFO] [stderr]    Compiling err-derive v0.3.1
[INFO] [stderr]     Checking catty v0.1.5
[INFO] [stderr]     Checking futures-util v0.3.30
[INFO] [stderr]     Checking barrage v0.2.3
[INFO] [stderr]     Checking itoa v1.0.10
[INFO] [stderr]     Checking ryu v1.0.16
[INFO] [stderr]     Checking futures-timer v3.0.2
[INFO] [stderr]     Checking pollster v0.2.5
[INFO] [stderr]     Checking glob v0.3.1
[INFO] [stderr]     Checking once_cell v1.19.0
[INFO] [stderr]     Checking unescape v0.1.0
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking signal-hook-registry v1.4.1
[INFO] [stderr]     Checking mio v0.8.10
[INFO] [stderr]     Checking getrandom v0.2.12
[INFO] [stderr]     Checking nix v0.24.3
[INFO] [stderr]     Checking num_cpus v1.16.0
[INFO] [stderr]     Checking nix v0.20.2
[INFO] [stderr]     Checking uuid v0.8.2
[INFO] [stderr]    Compiling synstructure v0.12.6
[INFO] [stderr]    Compiling pin-project-internal v1.1.4
[INFO] [stderr]    Compiling thiserror-impl v1.0.57
[INFO] [stderr]    Compiling serde_derive v1.0.196
[INFO] [stderr]    Compiling tokio-macros v2.2.0
[INFO] [stderr]    Compiling derive_more v0.99.17
[INFO] [stderr]    Compiling xtra_proc v0.1.0
[INFO] [stderr]     Checking tokio v1.36.0
[INFO] [stderr]     Checking pin-project v1.1.4
[INFO] [stderr]     Checking flume v0.10.14
[INFO] [stderr]     Checking xtra v0.5.2
[INFO] [stderr]     Checking psutil v3.3.0
[INFO] [stderr]     Checking tokio-stream v0.1.14
[INFO] [stderr]  Documenting nightfall v0.1.8 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(assert_matches, result_flattening, hash_drain_filter)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:2:28
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(assert_matches, result_flattening, hash_drain_filter)]
[INFO] [stdout]   |                            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:2:47
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(assert_matches, result_flattening, hash_drain_filter)]
[INFO] [stdout]   |                                               ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0635]: unknown feature `hash_drain_filter`
[INFO] [stdout]  --> src/lib.rs:2:47
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(assert_matches, result_flattening, hash_drain_filter)]
[INFO] [stdout]   |                                               ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0635.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `nightfall`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/beta-2024-02-10-x86_64-unknown-linux-gnu/bin/rustdoc --edition=2018 --crate-type lib --crate-name nightfall src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=254ccfe51e63fd80 -L dependency=/opt/rustwide/target/debug/deps --extern async_trait=/opt/rustwide/target/debug/deps/libasync_trait-e441009572a100d8.so --extern cfg_if=/opt/rustwide/target/debug/deps/libcfg_if-102ae0f1eb56902b.rmeta --extern err_derive=/opt/rustwide/target/debug/deps/liberr_derive-ded4152585b452b5.so --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-cc91e7c9c894213a.rmeta --extern nix=/opt/rustwide/target/debug/deps/libnix-9f3754d40cbf6f6f.rmeta --extern psutil=/opt/rustwide/target/debug/deps/libpsutil-ff4de4d5302ae7d4.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-abda5c6c4da1da32.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-cb3349f85e8297b8.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-b525625356671ea7.rmeta --extern slog=/opt/rustwide/target/debug/deps/libslog-d4b3080b3ac2965b.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-51f03ff18045ece3.rmeta --extern tokio_stream=/opt/rustwide/target/debug/deps/libtokio_stream-3ea542bb810b5581.rmeta --extern uuid=/opt/rustwide/target/debug/deps/libuuid-386134cfd5a4673b.rmeta --extern xtra=/opt/rustwide/target/debug/deps/libxtra-af48a87f0773f323.rmeta --extern xtra_proc=/opt/rustwide/target/debug/deps/libxtra_proc-7d6fb8ebecd0cf3b.so --cap-lints=warn --crate-version 0.1.8` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "317b2df4ca9a7522d9dd0373f2a00f5fc68424d9552fa7d1e1ba7c7486cc6aca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "317b2df4ca9a7522d9dd0373f2a00f5fc68424d9552fa7d1e1ba7c7486cc6aca", kill_on_drop: false }`
[INFO] [stdout] 317b2df4ca9a7522d9dd0373f2a00f5fc68424d9552fa7d1e1ba7c7486cc6aca
