[INFO] fetching crate veccentric 0.3.1...
[INFO] documenting veccentric-0.3.1 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate veccentric 0.3.1 into /workspace/builds/worker-21/source
[INFO] validating manifest of crates.io crate veccentric 0.3.1 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 veccentric 0.3.1
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate veccentric 0.3.1
[INFO] tweaked toml for crates.io crate veccentric 0.3.1 written to /workspace/builds/worker-21/source/Cargo.toml
[INFO] crate crates.io crate veccentric 0.3.1 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]  Downloading crates ...
[INFO] [stderr]   Downloaded drm-fourcc v2.2.0
[INFO] [stderr]   Downloaded external-memory v0.0.1
[INFO] [stderr]   Downloaded gfx-renderdoc v0.1.0
[INFO] [stderr]   Downloaded wgpu-core v0.9.2
[INFO] [stderr]   Downloaded gfx-backend-empty v0.9.0
[INFO] [stderr]   Downloaded thunderdome v0.4.1
[INFO] [stderr]   Downloaded gfx-backend-dx11 v0.9.0
[INFO] [stderr]   Downloaded gfx-auxil v0.10.0
[INFO] [stderr]   Downloaded gpu-alloc v0.4.7
[INFO] [stderr]   Downloaded glow v0.9.0
[INFO] [stderr]   Downloaded winit_input_helper v0.10.0
[INFO] [stderr]   Downloaded ultraviolet v0.8.1
[INFO] [stderr]   Downloaded wide v0.6.5
[INFO] [stderr]   Downloaded gfx-backend-dx12 v0.9.1
[INFO] [stderr]   Downloaded wgpu v0.9.0
[INFO] [stderr]   Downloaded wgpu-types v0.9.0
[INFO] [stderr]   Downloaded gfx-backend-gl v0.9.0
[INFO] [stderr]   Downloaded ash v0.32.1
[INFO] [stderr]   Downloaded gfx-hal v0.9.0
[INFO] [stderr]   Downloaded naga v0.5.0
[INFO] [stderr]   Downloaded rose_tree v0.2.0
[INFO] [stderr]   Downloaded gfx-backend-metal v0.9.1
[INFO] [stderr]   Downloaded gfx-backend-vulkan v0.9.0
[INFO] [stderr]   Downloaded pixels v0.5.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/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] 929d3ef6e4c0ad4bf87ab3f81fdea0b97bef52df80257601f4e0c6bb9b0a5e52
[INFO] running `Command { std: "docker" "start" "-a" "929d3ef6e4c0ad4bf87ab3f81fdea0b97bef52df80257601f4e0c6bb9b0a5e52", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "929d3ef6e4c0ad4bf87ab3f81fdea0b97bef52df80257601f4e0c6bb9b0a5e52", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "929d3ef6e4c0ad4bf87ab3f81fdea0b97bef52df80257601f4e0c6bb9b0a5e52", kill_on_drop: false }`
[INFO] [stdout] 929d3ef6e4c0ad4bf87ab3f81fdea0b97bef52df80257601f4e0c6bb9b0a5e52
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/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] e245f7c41671176087e913539b409c594039817fcfc602a34fb183a076caa1c0
[INFO] running `Command { std: "docker" "start" "-a" "e245f7c41671176087e913539b409c594039817fcfc602a34fb183a076caa1c0", kill_on_drop: false }`
[INFO] [stderr]  Documenting veccentric v0.3.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(doc_cfg, auto_traits, negative_impls)]
[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 `veccentric`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name veccentric src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=f34b912a96f88d74 -L dependency=/opt/rustwide/target/debug/deps --cap-lints=warn --crate-version 0.3.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "e245f7c41671176087e913539b409c594039817fcfc602a34fb183a076caa1c0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e245f7c41671176087e913539b409c594039817fcfc602a34fb183a076caa1c0", kill_on_drop: false }`
[INFO] [stdout] e245f7c41671176087e913539b409c594039817fcfc602a34fb183a076caa1c0