[INFO] cloning repository https://github.com/mdrokz/rounds_mod_downloader
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mdrokz/rounds_mod_downloader" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmdrokz%2Frounds_mod_downloader", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmdrokz%2Frounds_mod_downloader'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 908bccd4ff8e6860d670689ac961e41d3e1b52cc
[INFO] documenting mdrokz/rounds_mod_downloader against 1.61.0 for beta-1.62-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmdrokz%2Frounds_mod_downloader" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mdrokz/rounds_mod_downloader on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mdrokz/rounds_mod_downloader
[INFO] finished tweaking git repo https://github.com/mdrokz/rounds_mod_downloader
[INFO] tweaked toml for git repo https://github.com/mdrokz/rounds_mod_downloader written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/mdrokz/rounds_mod_downloader already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating git repository `https://github.com/mdrokz/unzip-rs`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded password-hash v0.3.2
[INFO] [stderr]   Downloaded pbkdf2 v0.10.1
[INFO] [stderr]   Downloaded base64ct v1.0.1
[INFO] [stderr]   Downloaded attohttpc v0.19.1
[INFO] [stderr]   Downloaded resolve-path v0.1.0
[INFO] [stderr]   Downloaded wildmatch v2.1.0
[INFO] [stderr]   Downloaded zstd v0.10.2+zstd.1.5.2
[INFO] [stderr]   Downloaded zstd-safe v4.1.6+zstd.1.5.2
[INFO] [stderr]   Downloaded zip v0.6.2
[INFO] [stderr]   Downloaded sha1 v0.10.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a0e0699218e04c8730570aa06203a7c963ea8a76b6ac33431e407b2464286097
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "a0e0699218e04c8730570aa06203a7c963ea8a76b6ac33431e407b2464286097", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a0e0699218e04c8730570aa06203a7c963ea8a76b6ac33431e407b2464286097", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a0e0699218e04c8730570aa06203a7c963ea8a76b6ac33431e407b2464286097", kill_on_drop: false }`
[INFO] [stdout] a0e0699218e04c8730570aa06203a7c963ea8a76b6ac33431e407b2464286097
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 6973ad87c0f6a8e9f0cad840f6c770d60282f1eb1cf32d9fa9d7c63a0399a26a
[INFO] running `Command { std: "docker" "start" "-a" "6973ad87c0f6a8e9f0cad840f6c770d60282f1eb1cf32d9fa9d7c63a0399a26a", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.93
[INFO] [stderr]    Compiling zstd-safe v4.1.6+zstd.1.5.2
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking base64ct v1.0.1
[INFO] [stderr]    Compiling heck v0.4.0
[INFO] [stderr]     Checking textwrap v0.15.0
[INFO] [stderr]     Checking flate2 v1.0.23
[INFO] [stderr]     Checking time v0.3.9
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]     Checking cipher v0.3.0
[INFO] [stderr]     Checking dirs v4.0.0
[INFO] [stderr]     Checking indexmap v1.8.1
[INFO] [stderr]    Compiling openssl-sys v0.9.73
[INFO] [stderr]     Checking digest v0.10.3
[INFO] [stderr]    Compiling bzip2-sys v0.1.11+1.0.8
[INFO] [stderr]     Checking aes v0.7.5
[INFO] [stderr]     Checking resolve-path v0.1.0
[INFO] [stderr]     Checking password-hash v0.3.2
[INFO] [stderr]     Checking sha2 v0.10.2
[INFO] [stderr]     Checking hmac v0.12.1
[INFO] [stderr]     Checking sha1 v0.10.1
[INFO] [stderr]     Checking pbkdf2 v0.10.1
[INFO] [stderr]     Checking zstd v0.10.2+zstd.1.5.2
[INFO] [stderr]     Checking bzip2 v0.4.3
[INFO] [stderr]    Compiling openssl v0.10.40
[INFO] [stderr]    Compiling native-tls v0.2.10
[INFO] [stderr]     Checking zip v0.6.2
[INFO] [stderr]     Checking unzip v1.0.1 (https://github.com/mdrokz/unzip-rs#13e0977d)
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling openssl-macros v0.1.0
[INFO] [stderr]    Compiling serde_derive v1.0.137
[INFO] [stderr]    Compiling clap_derive v3.1.18
[INFO] [stderr]     Checking clap v3.1.18
[INFO] [stderr]     Checking serde v1.0.137
[INFO] [stderr]     Checking attohttpc v0.19.1
[INFO] [stderr]     Checking serde_json v1.0.81
[INFO] [stderr]  Documenting rounds_mod_downloader v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(drain_filter)]
[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 `rounds_mod_downloader`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2021 --crate-type bin --crate-name rounds_mod_downloader src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=6d4ac9b3691b5dff -L dependency=/opt/rustwide/target/debug/deps --extern attohttpc=/opt/rustwide/target/debug/deps/libattohttpc-d12f855e27a30a30.rmeta --extern clap=/opt/rustwide/target/debug/deps/libclap-9bda844440e31dc0.rmeta --extern resolve_path=/opt/rustwide/target/debug/deps/libresolve_path-7d0e4b1c34759081.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-c524f42b9039c6c4.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-44f39dad6f17511e.rmeta --extern unzip=/opt/rustwide/target/debug/deps/libunzip-6a58822f94c3c646.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "6973ad87c0f6a8e9f0cad840f6c770d60282f1eb1cf32d9fa9d7c63a0399a26a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6973ad87c0f6a8e9f0cad840f6c770d60282f1eb1cf32d9fa9d7c63a0399a26a", kill_on_drop: false }`
[INFO] [stdout] 6973ad87c0f6a8e9f0cad840f6c770d60282f1eb1cf32d9fa9d7c63a0399a26a