[INFO] fetching crate simple-generators-util 0.1.1...
[INFO] documenting simple-generators-util-0.1.1 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate simple-generators-util 0.1.1 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate simple-generators-util 0.1.1 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 crates.io crate simple-generators-util 0.1.1
[INFO] finished tweaking crates.io crate simple-generators-util 0.1.1
[INFO] tweaked toml for crates.io crate simple-generators-util 0.1.1 written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[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] [stdout] b1604d41a8fc3c96d49ca2988cffdc4ccacddf81e27da92b92929c2394a0cba3
[INFO] running `Command { std: "docker" "start" "-a" "b1604d41a8fc3c96d49ca2988cffdc4ccacddf81e27da92b92929c2394a0cba3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b1604d41a8fc3c96d49ca2988cffdc4ccacddf81e27da92b92929c2394a0cba3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b1604d41a8fc3c96d49ca2988cffdc4ccacddf81e27da92b92929c2394a0cba3", kill_on_drop: false }`
[INFO] [stdout] b1604d41a8fc3c96d49ca2988cffdc4ccacddf81e27da92b92929c2394a0cba3
[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] [stdout] 963988e07b46fa87e16358c55fe6fa94375ce77391085b7f4cf33e60aba2c2d5
[INFO] running `Command { std: "docker" "start" "-a" "963988e07b46fa87e16358c55fe6fa94375ce77391085b7f4cf33e60aba2c2d5", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.39
[INFO] [stderr]    Compiling unicode-ident v1.0.0
[INFO] [stderr]    Compiling syn v1.0.95
[INFO] [stderr]    Compiling pin-project-internal v0.4.29
[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]     Checking pin-project v0.4.29
[INFO] [stderr]  Documenting simple-generators-util v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(generator_trait, never_type)]
[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 `simple-generators-util`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name simple_generators_util src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=ff305f253cbb5208 -L dependency=/opt/rustwide/target/debug/deps --extern pin_project=/opt/rustwide/target/debug/deps/libpin_project-4a29ff8a6093e393.rmeta --cap-lints=warn --crate-version 0.1.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "963988e07b46fa87e16358c55fe6fa94375ce77391085b7f4cf33e60aba2c2d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "963988e07b46fa87e16358c55fe6fa94375ce77391085b7f4cf33e60aba2c2d5", kill_on_drop: false }`
[INFO] [stdout] 963988e07b46fa87e16358c55fe6fa94375ce77391085b7f4cf33e60aba2c2d5