[INFO] fetching crate nightfall 0.1.8...
[INFO] documenting nightfall-0.1.8 against beta-2021-08-01 for beta-1.55-rustdoc-1
[INFO] extracting crate nightfall 0.1.8 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate nightfall 0.1.8 on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate nightfall 0.1.8
[INFO] finished tweaking crates.io crate nightfall 0.1.8
[INFO] tweaked toml for crates.io crate nightfall 0.1.8 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded catty v0.1.4
[INFO] [stderr]   Downloaded barrage v0.2.1
[INFO] [stderr]   Downloaded slog v2.7.0
[INFO] [stderr]   Downloaded spinny v0.2.2
[INFO] [stderr]   Downloaded spin v0.7.1
[INFO] [stderr]   Downloaded unescape v0.1.0
[INFO] [stderr]   Downloaded err-derive v0.3.0
[INFO] [stderr]   Downloaded darwin-libproc-sys v0.1.2
[INFO] [stderr]   Downloaded xtra_proc v0.1.0
[INFO] [stderr]   Downloaded darwin-libproc v0.1.2
[INFO] [stderr]   Downloaded psutil v3.2.1
[INFO] [stderr]   Downloaded tokio-stream v0.1.7
[INFO] [stderr]   Downloaded pollster v0.2.4
[INFO] [stderr]   Downloaded xtra v0.5.1
[INFO] [stderr]   Downloaded rustversion v1.0.5
[INFO] [stderr]   Downloaded flume v0.10.8
[INFO] [stderr]   Downloaded generator v0.6.25
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bd3da935580c0e96fad28ee22231af578d95511d1fe9fb97f074abd862662053
[INFO] running `Command { std: "docker" "start" "-a" "bd3da935580c0e96fad28ee22231af578d95511d1fe9fb97f074abd862662053", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bd3da935580c0e96fad28ee22231af578d95511d1fe9fb97f074abd862662053", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bd3da935580c0e96fad28ee22231af578d95511d1fe9fb97f074abd862662053", kill_on_drop: false }`
[INFO] [stdout] bd3da935580c0e96fad28ee22231af578d95511d1fe9fb97f074abd862662053
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 39bc4207b24250f4d7b5c96da60e72358cda9cb51647dc597abc2be794a66b93
[INFO] running `Command { std: "docker" "start" "-a" "39bc4207b24250f4d7b5c96da60e72358cda9cb51647dc597abc2be794a66b93", kill_on_drop: false }`
[INFO] [stderr]    Compiling rustversion v1.0.5
[INFO] [stderr]    Compiling nix v0.17.0
[INFO] [stderr]     Checking futures-sink v0.3.16
[INFO] [stderr]    Compiling slog v2.7.0
[INFO] [stderr]     Checking spin v0.7.1
[INFO] [stderr]     Checking unescape v0.1.0
[INFO] [stderr]     Checking pollster v0.2.4
[INFO] [stderr]     Checking platforms v0.2.1
[INFO] [stderr]    Compiling tokio v1.9.0
[INFO] [stderr]    Compiling futures-util v0.3.16
[INFO] [stderr]     Checking spinning_top v0.2.4
[INFO] [stderr]     Checking spinny v0.2.2
[INFO] [stderr]     Checking mio v0.7.13
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]    Compiling pin-project-internal v1.0.8
[INFO] [stderr]    Compiling futures-macro v0.3.16
[INFO] [stderr]    Compiling tokio-macros v1.3.0
[INFO] [stderr]    Compiling synstructure v0.12.5
[INFO] [stderr]    Compiling derive_more v0.99.16
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling async-trait v0.1.51
[INFO] [stderr]    Compiling xtra_proc v0.1.0
[INFO] [stderr]     Checking barrage v0.2.1
[INFO] [stderr]     Checking uuid v0.8.2
[INFO] [stderr]     Checking catty v0.1.4
[INFO] [stderr]    Compiling err-derive v0.3.0
[INFO] [stderr]     Checking pin-project v1.0.8
[INFO] [stderr]     Checking flume v0.10.8
[INFO] [stderr]     Checking psutil v3.2.1
[INFO] [stderr]     Checking xtra v0.5.1
[INFO] [stderr]     Checking tokio-stream v0.1.7
[INFO] [stderr]  Documenting nightfall v0.1.8 (/opt/rustwide/workdir)
[INFO] [stderr] error: could not document `nightfall`
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(assert_matches, result_flattening, hash_drain_filter)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] Caused by:
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name nightfall src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern async_trait=/opt/rustwide/target/debug/deps/libasync_trait-f2946c79c65a298b.so --extern cfg_if=/opt/rustwide/target/debug/deps/libcfg_if-86cb6b55248c00db.rmeta --extern err_derive=/opt/rustwide/target/debug/deps/liberr_derive-8df25c96705e2231.so --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-5e37eee3e84fafab.rmeta --extern nix=/opt/rustwide/target/debug/deps/libnix-f7064373e7ef742b.rmeta --extern psutil=/opt/rustwide/target/debug/deps/libpsutil-7c5129a763e8adca.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-253739828b8c95ea.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-5cc25ffc812d3406.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-ec38e93d68fa8a39.rmeta --extern slog=/opt/rustwide/target/debug/deps/libslog-dd5e3623c9db8a5a.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-ab1d7424dd436293.rmeta --extern tokio_stream=/opt/rustwide/target/debug/deps/libtokio_stream-01c083ec3a7616f3.rmeta --extern uuid=/opt/rustwide/target/debug/deps/libuuid-eb81b13424c87c43.rmeta --extern xtra=/opt/rustwide/target/debug/deps/libxtra-dfbb94b703428769.rmeta --extern xtra_proc=/opt/rustwide/target/debug/deps/libxtra_proc-16ae9092f155aecc.so --cap-lints=warn --crate-version 0.1.8` (exit status: 1)
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "39bc4207b24250f4d7b5c96da60e72358cda9cb51647dc597abc2be794a66b93", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "39bc4207b24250f4d7b5c96da60e72358cda9cb51647dc597abc2be794a66b93", kill_on_drop: false }`
[INFO] [stdout] 39bc4207b24250f4d7b5c96da60e72358cda9cb51647dc597abc2be794a66b93
