[INFO] cloning repository https://github.com/moonshadow565/rman
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/moonshadow565/rman" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmoonshadow565%2Frman", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmoonshadow565%2Frman'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 174d29e2062608856f5b5990fa6ce03a32cdc1f5
[INFO] documenting moonshadow565/rman 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%2Fmoonshadow565%2Frman" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/moonshadow565/rman 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/moonshadow565/rman
[INFO] finished tweaking git repo https://github.com/moonshadow565/rman
[INFO] tweaked toml for git repo https://github.com/moonshadow565/rman written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/moonshadow565/rman 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] warning: version requirement `0.8.1+zstd.1.4.9` for dependency `zstd` includes semver metadata which will be ignored, removing the metadata is recommended to avoid confusion
[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 zstd-safe v4.1.0+zstd.1.5.0
[INFO] [stderr]   Downloaded jobserver v0.1.22
[INFO] [stderr]   Downloaded const_fn v0.4.7
[INFO] [stderr]   Downloaded ureq v2.1.1
[INFO] [stderr]   Downloaded cookie v0.15.0
[INFO] [stderr]   Downloaded zstd v0.8.1+zstd.1.5.0
[INFO] [stderr]   Downloaded publicsuffix v1.5.6
[INFO] [stderr]   Downloaded zstd-sys v1.6.0+zstd.1.5.0
[INFO] [stderr]   Downloaded cookie_store v0.13.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] 4148f7b7e06b55f15bba36276354eb697b214ccba87fcdf16c28baee98fcdc52
[INFO] running `Command { std: "docker" "start" "-a" "4148f7b7e06b55f15bba36276354eb697b214ccba87fcdf16c28baee98fcdc52", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4148f7b7e06b55f15bba36276354eb697b214ccba87fcdf16c28baee98fcdc52", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4148f7b7e06b55f15bba36276354eb697b214ccba87fcdf16c28baee98fcdc52", kill_on_drop: false }`
[INFO] [stdout] 4148f7b7e06b55f15bba36276354eb697b214ccba87fcdf16c28baee98fcdc52
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] a871c047557dbde6e393fcc2022c1ce6ada8a7bd9c209ce6a57e6597e454474f
[INFO] running `Command { std: "docker" "start" "-a" "a871c047557dbde6e393fcc2022c1ce6ada8a7bd9c209ce6a57e6597e454474f", kill_on_drop: false }`
[INFO] [stderr] warning: version requirement `0.8.1+zstd.1.4.9` for dependency `zstd` includes semver metadata which will be ignored, removing the metadata is recommended to avoid confusion
[INFO] [stderr]    Compiling libc v0.2.98
[INFO] [stderr]    Compiling proc-macro2 v1.0.26
[INFO] [stderr]    Compiling syn v1.0.72
[INFO] [stderr]    Compiling crossbeam-utils v0.8.5
[INFO] [stderr]    Compiling const_fn v0.4.7
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.5
[INFO] [stderr]    Compiling rayon-core v1.9.1
[INFO] [stderr]    Compiling zstd-safe v4.1.0+zstd.1.5.0
[INFO] [stderr]     Checking itoa v0.4.7
[INFO] [stderr]     Checking chunked_transfer v1.4.0
[INFO] [stderr]     Checking cpufeatures v0.1.5
[INFO] [stderr]    Compiling standback v0.2.17
[INFO] [stderr]    Compiling memoffset v0.6.4
[INFO] [stderr]    Compiling time v0.2.26
[INFO] [stderr]    Compiling typenum v1.13.0
[INFO] [stderr]    Compiling generic-array v0.14.4
[INFO] [stderr]    Compiling indexmap v1.6.2
[INFO] [stderr]     Checking form_urlencoded v1.0.1
[INFO] [stderr]    Compiling cookie v0.15.0
[INFO] [stderr]    Compiling serde_json v1.0.64
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]     Checking unicode-normalization v0.1.17
[INFO] [stderr]     Checking log v0.4.14
[INFO] [stderr]     Checking crossbeam-channel v0.5.1
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]     Checking idna v0.2.3
[INFO] [stderr]    Compiling jobserver v0.1.22
[INFO] [stderr]     Checking crossbeam-deque v0.8.0
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]    Compiling cc v1.0.67
[INFO] [stderr]     Checking url v2.2.2
[INFO] [stderr]     Checking block-buffer v0.9.0
[INFO] [stderr]     Checking digest v0.9.0
[INFO] [stderr]     Checking sha2 v0.9.5
[INFO] [stderr]     Checking publicsuffix v1.5.6
[INFO] [stderr]    Compiling ring v0.16.20
[INFO] [stderr]    Compiling zstd-sys v1.6.0+zstd.1.5.0
[INFO] [stderr]    Compiling time-macros-impl v0.1.1
[INFO] [stderr]    Compiling serde_derive v1.0.126
[INFO] [stderr]     Checking time-macros v0.1.1
[INFO] [stderr]     Checking serde v1.0.126
[INFO] [stderr]     Checking webpki v0.21.4
[INFO] [stderr]     Checking sct v0.6.1
[INFO] [stderr]     Checking rustls v0.19.1
[INFO] [stderr]     Checking webpki-roots v0.21.1
[INFO] [stderr]     Checking cookie_store v0.13.3
[INFO] [stderr]     Checking rustls-native-certs v0.5.0
[INFO] [stderr]     Checking ureq v2.1.1
[INFO] [stderr]     Checking zstd v0.8.1+zstd.1.5.0
[INFO] [stderr]  Documenting rman 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:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(map_first_last)]
[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 `rman`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name rman src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=a2b59f147b0aa3e1 -L dependency=/opt/rustwide/target/debug/deps --extern rayon=/opt/rustwide/target/debug/deps/librayon-852503d033f845cf.rmeta --extern sha2=/opt/rustwide/target/debug/deps/libsha2-bd4b18ab84906238.rmeta --extern ureq=/opt/rustwide/target/debug/deps/libureq-780f14a6502b69e0.rmeta --extern zstd=/opt/rustwide/target/debug/deps/libzstd-c94d24fd5b24a651.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "a871c047557dbde6e393fcc2022c1ce6ada8a7bd9c209ce6a57e6597e454474f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a871c047557dbde6e393fcc2022c1ce6ada8a7bd9c209ce6a57e6597e454474f", kill_on_drop: false }`
[INFO] [stdout] a871c047557dbde6e393fcc2022c1ce6ada8a7bd9c209ce6a57e6597e454474f