[INFO] cloning repository https://github.com/tritoke/riet
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/tritoke/riet" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftritoke%2Friet", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftritoke%2Friet'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 908192df201c90021e80e0de0e2f7c3aef41894d
[INFO] documenting tritoke/riet 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%2Ftritoke%2Friet" "/workspace/builds/worker-12/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/tritoke/riet 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/tritoke/riet
[INFO] finished tweaking git repo https://github.com/tritoke/riet
[INFO] tweaked toml for git repo https://github.com/tritoke/riet written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/tritoke/riet 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 7fcbe2607c7854182b5a573c44a5a2189e461c46daa2e145fd9a1da5552354d9
[INFO] running `Command { std: "docker" "start" "-a" "7fcbe2607c7854182b5a573c44a5a2189e461c46daa2e145fd9a1da5552354d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7fcbe2607c7854182b5a573c44a5a2189e461c46daa2e145fd9a1da5552354d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7fcbe2607c7854182b5a573c44a5a2189e461c46daa2e145fd9a1da5552354d9", kill_on_drop: false }`
[INFO] [stdout] 7fcbe2607c7854182b5a573c44a5a2189e461c46daa2e145fd9a1da5552354d9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] d95634e3343fbf09045ffb3278e6b342b225672db50a2149e85f6266d4e1c7b5
[INFO] running `Command { std: "docker" "start" "-a" "d95634e3343fbf09045ffb3278e6b342b225672db50a2149e85f6266d4e1c7b5", kill_on_drop: false }`
[INFO] [stderr]    Compiling anyhow v1.0.43
[INFO] [stderr]    Compiling memoffset v0.6.4
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]    Compiling miniz_oxide v0.4.4
[INFO] [stderr]    Compiling num-rational v0.3.2
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]    Compiling num-bigint v0.4.2
[INFO] [stderr]     Checking gif v0.11.2
[INFO] [stderr]     Checking crossbeam-utils v0.8.5
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking png v0.16.8
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]     Checking colored v1.9.3
[INFO] [stderr]     Checking crossbeam-channel v0.5.1
[INFO] [stderr]     Checking simple_logger v1.13.0
[INFO] [stderr]     Checking crossbeam-epoch v0.9.5
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]     Checking crossbeam-deque v0.8.1
[INFO] [stderr]    Compiling structopt-derive v0.4.16
[INFO] [stderr]     Checking rayon-core v1.9.1
[INFO] [stderr]     Checking structopt v0.3.23
[INFO] [stderr]     Checking jpeg-decoder v0.1.22
[INFO] [stderr]     Checking tiff v0.6.1
[INFO] [stderr]     Checking image v0.23.14
[INFO] [stderr]  Documenting riet 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:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | / #![feature(
[INFO] [stdout] 2 | |     derive_default_enum,
[INFO] [stdout] 3 | |     stmt_expr_attributes,
[INFO] [stdout] 4 | |     never_type,
[INFO] [stdout] 5 | |     array_windows,
[INFO] [stdout] 6 | | )]
[INFO] [stdout]   | |__^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `riet`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2021 --crate-type bin --crate-name riet src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=93a3b954b880d5fc -L dependency=/opt/rustwide/target/debug/deps --extern anyhow=/opt/rustwide/target/debug/deps/libanyhow-d285cee26cfc4d53.rmeta --extern image=/opt/rustwide/target/debug/deps/libimage-9c703a1ae2d62b4a.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-1e3c371ab90a7930.rmeta --extern num_bigint=/opt/rustwide/target/debug/deps/libnum_bigint-5f3d984e40853297.rmeta --extern num_traits=/opt/rustwide/target/debug/deps/libnum_traits-0332a0a98538df27.rmeta --extern simple_logger=/opt/rustwide/target/debug/deps/libsimple_logger-f892a7ac3c901ef4.rmeta --extern structopt=/opt/rustwide/target/debug/deps/libstructopt-cdf23d838df24c82.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "d95634e3343fbf09045ffb3278e6b342b225672db50a2149e85f6266d4e1c7b5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d95634e3343fbf09045ffb3278e6b342b225672db50a2149e85f6266d4e1c7b5", kill_on_drop: false }`
[INFO] [stdout] d95634e3343fbf09045ffb3278e6b342b225672db50a2149e85f6266d4e1c7b5