[INFO] cloning repository https://github.com/R4chel/art
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/R4chel/art" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FR4chel%2Fart", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FR4chel%2Fart'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9afcd6660e4f76df8f2df2000c46aa1240cbe1ea
[INFO] documenting R4chel/art 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%2FR4chel%2Fart" "/workspace/builds/worker-22/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-22/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/R4chel/art 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/R4chel/art
[INFO] finished tweaking git repo https://github.com/R4chel/art
[INFO] tweaked toml for git repo https://github.com/R4chel/art written to /workspace/builds/worker-22/source/Cargo.toml
[INFO] crate git repo https://github.com/R4chel/art 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]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded hsl v0.1.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/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] 81f9b8a33d8f889ab7c57543ff871f81e4346d87dc6ed31b7e15a5acef0b4d9d
[INFO] running `Command { std: "docker" "start" "-a" "81f9b8a33d8f889ab7c57543ff871f81e4346d87dc6ed31b7e15a5acef0b4d9d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "81f9b8a33d8f889ab7c57543ff871f81e4346d87dc6ed31b7e15a5acef0b4d9d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "81f9b8a33d8f889ab7c57543ff871f81e4346d87dc6ed31b7e15a5acef0b4d9d", kill_on_drop: false }`
[INFO] [stdout] 81f9b8a33d8f889ab7c57543ff871f81e4346d87dc6ed31b7e15a5acef0b4d9d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/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] [stdout] 3e55904b587763463b478649f8dca0bffabd94384ad66afba525ee71e4e37a83
[INFO] running `Command { std: "docker" "start" "-a" "3e55904b587763463b478649f8dca0bffabd94384ad66afba525ee71e4e37a83", kill_on_drop: false }`
[INFO] [stderr]    Compiling wasm-bindgen-shared v0.2.71
[INFO] [stderr]    Compiling syn v1.0.60
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling libc v0.2.87
[INFO] [stderr]    Compiling bumpalo v3.6.1
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]    Compiling wasm-bindgen v0.2.71
[INFO] [stderr]     Checking ppv-lite86 v0.2.10
[INFO] [stderr]     Checking hsl v0.1.1
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]    Compiling wasm-bindgen-backend v0.2.71
[INFO] [stderr]    Compiling wasm-bindgen-macro-support v0.2.71
[INFO] [stderr]    Compiling wasm-bindgen-macro v0.2.71
[INFO] [stderr]     Checking js-sys v0.3.48
[INFO] [stderr]     Checking web-sys v0.3.48
[INFO] [stderr]  Documenting art 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: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 `art`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type cdylib --crate-name art src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=6f64aa04828fd01f -L dependency=/opt/rustwide/target/debug/deps --extern hsl=/opt/rustwide/target/debug/deps/libhsl-b83cdad95d2eb5ff.rmeta --extern js_sys=/opt/rustwide/target/debug/deps/libjs_sys-eee4dca69a5a1a9d.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-0da3278ef32b2e06.rmeta --extern wasm_bindgen=/opt/rustwide/target/debug/deps/libwasm_bindgen-da37a832f1a7be1e.rmeta --extern web_sys=/opt/rustwide/target/debug/deps/libweb_sys-12bc6044dd8904f4.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "3e55904b587763463b478649f8dca0bffabd94384ad66afba525ee71e4e37a83", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3e55904b587763463b478649f8dca0bffabd94384ad66afba525ee71e4e37a83", kill_on_drop: false }`
[INFO] [stdout] 3e55904b587763463b478649f8dca0bffabd94384ad66afba525ee71e4e37a83