[INFO] cloning repository https://github.com/JoeyEamigh/apcupsd-mqtt-exporter
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/JoeyEamigh/apcupsd-mqtt-exporter" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJoeyEamigh%2Fapcupsd-mqtt-exporter", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJoeyEamigh%2Fapcupsd-mqtt-exporter'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d2f4899333bbe04839a50c64c83569d73897aa75
[INFO] documenting JoeyEamigh/apcupsd-mqtt-exporter against 1.76.0 for beta-1.77-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJoeyEamigh%2Fapcupsd-mqtt-exporter" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/JoeyEamigh/apcupsd-mqtt-exporter 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] removed /workspace/builds/worker-5-tc1/source/rust-toolchain.toml
[INFO] started tweaking git repo https://github.com/JoeyEamigh/apcupsd-mqtt-exporter
[INFO] finished tweaking git repo https://github.com/JoeyEamigh/apcupsd-mqtt-exporter
[INFO] tweaked toml for git repo https://github.com/JoeyEamigh/apcupsd-mqtt-exporter written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/JoeyEamigh/apcupsd-mqtt-exporter 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 serde_derive v1.0.188
[INFO] [stderr]   Downloaded base64 v0.21.3
[INFO] [stderr]   Downloaded rumqttc v0.22.0
[INFO] [stderr]   Downloaded object v0.32.0
[INFO] [stderr]   Downloaded rustls-webpki v0.100.2
[INFO] [stderr]   Downloaded serde v1.0.188
[INFO] [stderr]   Downloaded apcaccess v0.1.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] e3be293002285bc3ed1994149b38f05805978c82283f58f542bba7969d26623a
[INFO] running `Command { std: "docker" "start" "-a" "e3be293002285bc3ed1994149b38f05805978c82283f58f542bba7969d26623a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e3be293002285bc3ed1994149b38f05805978c82283f58f542bba7969d26623a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e3be293002285bc3ed1994149b38f05805978c82283f58f542bba7969d26623a", kill_on_drop: false }`
[INFO] [stdout] e3be293002285bc3ed1994149b38f05805978c82283f58f542bba7969d26623a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 5b439eeb5daea49e8289aa0368a7ef93691ed6b39d79b2ce2b12bea2f04781ed
[INFO] running `Command { std: "docker" "start" "-a" "5b439eeb5daea49e8289aa0368a7ef93691ed6b39d79b2ce2b12bea2f04781ed", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.66
[INFO] [stderr]    Compiling libc v0.2.147
[INFO] [stderr]    Compiling unicode-ident v1.0.11
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]     Checking once_cell v1.18.0
[INFO] [stderr]     Checking pin-project-lite v0.2.13
[INFO] [stderr]    Compiling futures-core v0.3.28
[INFO] [stderr]     Checking spin v0.5.2
[INFO] [stderr]     Checking scopeguard v1.2.0
[INFO] [stderr]     Checking untrusted v0.7.1
[INFO] [stderr]     Checking futures-sink v0.3.28
[INFO] [stderr]     Checking smallvec v1.11.0
[INFO] [stderr]    Compiling futures-channel v0.3.28
[INFO] [stderr]    Compiling parking_lot_core v0.9.8
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling futures-task v0.3.28
[INFO] [stderr]    Compiling lock_api v0.4.10
[INFO] [stderr]    Compiling slab v0.4.9
[INFO] [stderr]    Compiling futures-util v0.3.28
[INFO] [stderr]     Checking log v0.4.20
[INFO] [stderr]    Compiling quote v1.0.33
[INFO] [stderr]    Compiling rustls v0.21.6
[INFO] [stderr]     Checking futures-io v0.3.28
[INFO] [stderr]    Compiling syn v2.0.29
[INFO] [stderr]     Checking pin-utils v0.1.0
[INFO] [stderr]     Checking tracing-core v0.1.31
[INFO] [stderr]    Compiling cc v1.0.83
[INFO] [stderr]    Compiling serde v1.0.188
[INFO] [stderr]     Checking base64 v0.21.3
[INFO] [stderr]     Checking regex-syntax v0.7.4
[INFO] [stderr]     Checking mio v0.8.8
[INFO] [stderr]     Checking socket2 v0.5.3
[INFO] [stderr]     Checking getrandom v0.2.10
[INFO] [stderr]     Checking parking_lot v0.12.1
[INFO] [stderr]     Checking num_cpus v1.16.0
[INFO] [stderr]     Checking signal-hook-registry v1.4.1
[INFO] [stderr]     Checking bytes v1.4.0
[INFO] [stderr]    Compiling thiserror v1.0.47
[INFO] [stderr]     Checking regex-syntax v0.6.29
[INFO] [stderr]     Checking nanorand v0.7.0
[INFO] [stderr]     Checking rustls-pemfile v1.0.3
[INFO] [stderr]     Checking spin v0.9.8
[INFO] [stderr]     Checking overload v0.1.1
[INFO] [stderr]    Compiling serde_json v1.0.105
[INFO] [stderr]     Checking openssl-probe v0.1.5
[INFO] [stderr]     Checking nu-ansi-term v0.46.0
[INFO] [stderr]     Checking rustls-native-certs v0.6.3
[INFO] [stderr]     Checking tracing-log v0.1.3
[INFO] [stderr]     Checking sharded-slab v0.1.4
[INFO] [stderr]     Checking thread_local v1.1.7
[INFO] [stderr]     Checking ryu v1.0.15
[INFO] [stderr]     Checking itoa v1.0.9
[INFO] [stderr]     Checking apcaccess v0.1.3
[INFO] [stderr]    Compiling ring v0.16.20
[INFO] [stderr]     Checking regex-automata v0.3.6
[INFO] [stderr]     Checking regex-automata v0.1.10
[INFO] [stderr]     Checking regex v1.9.3
[INFO] [stderr]     Checking matchers v0.1.0
[INFO] [stderr]    Compiling futures-macro v0.3.28
[INFO] [stderr]    Compiling tokio-macros v2.1.0
[INFO] [stderr]    Compiling pin-project-internal v1.1.3
[INFO] [stderr]    Compiling tracing-attributes v0.1.26
[INFO] [stderr]    Compiling thiserror-impl v1.0.47
[INFO] [stderr]     Checking rustls-webpki v0.101.4
[INFO] [stderr]     Checking sct v0.7.0
[INFO] [stderr]     Checking tokio v1.32.0
[INFO] [stderr]     Checking rustls-webpki v0.100.2
[INFO] [stderr]     Checking pin-project v1.1.3
[INFO] [stderr]     Checking tracing v0.1.37
[INFO] [stderr]     Checking flume v0.10.14
[INFO] [stderr]     Checking tracing-subscriber v0.3.17
[INFO] [stderr]     Checking futures-executor v0.3.28
[INFO] [stderr]     Checking futures v0.3.28
[INFO] [stderr]     Checking tokio-rustls v0.24.1
[INFO] [stderr]     Checking rumqttc v0.22.0
[INFO] [stderr]  Documenting apcupsd-mqtt-exporter v0.2.3 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(let_chains)]
[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 `apcupsd-mqtt-exporter`
[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 bin --crate-name apcupsd_mqtt_exporter src/main.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=01a6c8c9977abfbd -L dependency=/opt/rustwide/target/debug/deps --extern apcaccess=/opt/rustwide/target/debug/deps/libapcaccess-432c5cf8d1665167.rmeta --extern rumqttc=/opt/rustwide/target/debug/deps/librumqttc-902b3214ba188702.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-4e95dc64c0a5284f.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-6fe88e6f28b24903.rmeta --extern tracing=/opt/rustwide/target/debug/deps/libtracing-ff5db1c6d255c187.rmeta --extern tracing_subscriber=/opt/rustwide/target/debug/deps/libtracing_subscriber-e4fe373c67bf9f29.rmeta --cap-lints=warn --crate-version 0.2.3` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "5b439eeb5daea49e8289aa0368a7ef93691ed6b39d79b2ce2b12bea2f04781ed", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5b439eeb5daea49e8289aa0368a7ef93691ed6b39d79b2ce2b12bea2f04781ed", kill_on_drop: false }`
[INFO] [stdout] 5b439eeb5daea49e8289aa0368a7ef93691ed6b39d79b2ce2b12bea2f04781ed
[INFO] documenting JoeyEamigh/apcupsd-mqtt-exporter against beta-2024-02-10 for beta-1.77-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJoeyEamigh%2Fapcupsd-mqtt-exporter" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/JoeyEamigh/apcupsd-mqtt-exporter 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] removed /workspace/builds/worker-5-tc2/source/rust-toolchain.toml
[INFO] started tweaking git repo https://github.com/JoeyEamigh/apcupsd-mqtt-exporter
[INFO] finished tweaking git repo https://github.com/JoeyEamigh/apcupsd-mqtt-exporter
[INFO] tweaked toml for git repo https://github.com/JoeyEamigh/apcupsd-mqtt-exporter written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/JoeyEamigh/apcupsd-mqtt-exporter 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" "+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-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 8a456cb6c6b35057b0ecfbbf3f105a317fc214a208d25d4e0d66e1a43aa8c72b
[INFO] running `Command { std: "docker" "start" "-a" "8a456cb6c6b35057b0ecfbbf3f105a317fc214a208d25d4e0d66e1a43aa8c72b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8a456cb6c6b35057b0ecfbbf3f105a317fc214a208d25d4e0d66e1a43aa8c72b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8a456cb6c6b35057b0ecfbbf3f105a317fc214a208d25d4e0d66e1a43aa8c72b", kill_on_drop: false }`
[INFO] [stdout] 8a456cb6c6b35057b0ecfbbf3f105a317fc214a208d25d4e0d66e1a43aa8c72b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 559854e544685f84e33425bacc7881818ecef7b14625f91f42f2c5972c3fc928
[INFO] running `Command { std: "docker" "start" "-a" "559854e544685f84e33425bacc7881818ecef7b14625f91f42f2c5972c3fc928", 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 autocfg v1.1.0
[INFO] [stderr]     Checking once_cell v1.18.0
[INFO] [stderr]    Compiling futures-core v0.3.28
[INFO] [stderr]     Checking pin-project-lite v0.2.13
[INFO] [stderr]     Checking spin v0.5.2
[INFO] [stderr]     Checking scopeguard v1.2.0
[INFO] [stderr]     Checking untrusted v0.7.1
[INFO] [stderr]     Checking futures-sink v0.3.28
[INFO] [stderr]    Compiling futures-task v0.3.28
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling parking_lot_core v0.9.8
[INFO] [stderr]    Compiling lock_api v0.4.10
[INFO] [stderr]    Compiling slab v0.4.9
[INFO] [stderr]    Compiling futures-channel v0.3.28
[INFO] [stderr]     Checking smallvec v1.11.0
[INFO] [stderr]     Checking log v0.4.20
[INFO] [stderr]    Compiling futures-util v0.3.28
[INFO] [stderr]    Compiling quote v1.0.33
[INFO] [stderr]    Compiling syn v2.0.29
[INFO] [stderr]     Checking futures-io v0.3.28
[INFO] [stderr]    Compiling rustls v0.21.6
[INFO] [stderr]     Checking pin-utils v0.1.0
[INFO] [stderr]     Checking tracing-core v0.1.31
[INFO] [stderr]     Checking mio v0.8.8
[INFO] [stderr]    Compiling cc v1.0.83
[INFO] [stderr]     Checking socket2 v0.5.3
[INFO] [stderr]     Checking getrandom v0.2.10
[INFO] [stderr]     Checking parking_lot v0.12.1
[INFO] [stderr]     Checking signal-hook-registry v1.4.1
[INFO] [stderr]     Checking num_cpus v1.16.0
[INFO] [stderr]     Checking bytes v1.4.0
[INFO] [stderr]     Checking regex-syntax v0.6.29
[INFO] [stderr]    Compiling serde v1.0.188
[INFO] [stderr]    Compiling thiserror v1.0.47
[INFO] [stderr]     Checking base64 v0.21.3
[INFO] [stderr]     Checking regex-syntax v0.7.4
[INFO] [stderr]     Checking rustls-pemfile v1.0.3
[INFO] [stderr]     Checking nanorand v0.7.0
[INFO] [stderr]     Checking spin v0.9.8
[INFO] [stderr]     Checking overload v0.1.1
[INFO] [stderr]    Compiling serde_json v1.0.105
[INFO] [stderr]     Checking openssl-probe v0.1.5
[INFO] [stderr]     Checking rustls-native-certs v0.6.3
[INFO] [stderr]     Checking nu-ansi-term v0.46.0
[INFO] [stderr]     Checking sharded-slab v0.1.4
[INFO] [stderr]     Checking tracing-log v0.1.3
[INFO] [stderr]     Checking thread_local v1.1.7
[INFO] [stderr]     Checking ryu v1.0.15
[INFO] [stderr]     Checking itoa v1.0.9
[INFO] [stderr]     Checking apcaccess v0.1.3
[INFO] [stderr]    Compiling ring v0.16.20
[INFO] [stderr]     Checking regex-automata v0.3.6
[INFO] [stderr]     Checking regex-automata v0.1.10
[INFO] [stderr]     Checking matchers v0.1.0
[INFO] [stderr]     Checking regex v1.9.3
[INFO] [stderr]    Compiling futures-macro v0.3.28
[INFO] [stderr]    Compiling pin-project-internal v1.1.3
[INFO] [stderr]    Compiling tokio-macros v2.1.0
[INFO] [stderr]    Compiling thiserror-impl v1.0.47
[INFO] [stderr]    Compiling tracing-attributes v0.1.26
[INFO] [stderr]     Checking tokio v1.32.0
[INFO] [stderr]     Checking rustls-webpki v0.101.4
[INFO] [stderr]     Checking sct v0.7.0
[INFO] [stderr]     Checking rustls-webpki v0.100.2
[INFO] [stderr]     Checking pin-project v1.1.3
[INFO] [stderr]     Checking flume v0.10.14
[INFO] [stderr]     Checking tracing v0.1.37
[INFO] [stderr]     Checking tracing-subscriber v0.3.17
[INFO] [stderr]     Checking futures-executor v0.3.28
[INFO] [stderr]     Checking futures v0.3.28
[INFO] [stderr]     Checking tokio-rustls v0.24.1
[INFO] [stderr]     Checking rumqttc v0.22.0
[INFO] [stderr]  Documenting apcupsd-mqtt-exporter v0.2.3 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(let_chains)]
[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 `apcupsd-mqtt-exporter`
[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=2021 --crate-type bin --crate-name apcupsd_mqtt_exporter src/main.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=12163cafd1064fd9 -L dependency=/opt/rustwide/target/debug/deps --extern apcaccess=/opt/rustwide/target/debug/deps/libapcaccess-55e5538897b3b186.rmeta --extern rumqttc=/opt/rustwide/target/debug/deps/librumqttc-8178c6c1b546be2d.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-f2f738f8925d8d33.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-1ae0e7045c417867.rmeta --extern tracing=/opt/rustwide/target/debug/deps/libtracing-924dc5c14d24f633.rmeta --extern tracing_subscriber=/opt/rustwide/target/debug/deps/libtracing_subscriber-4c172654b62394ce.rmeta --cap-lints=warn --crate-version 0.2.3` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "559854e544685f84e33425bacc7881818ecef7b14625f91f42f2c5972c3fc928", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "559854e544685f84e33425bacc7881818ecef7b14625f91f42f2c5972c3fc928", kill_on_drop: false }`
[INFO] [stdout] 559854e544685f84e33425bacc7881818ecef7b14625f91f42f2c5972c3fc928
