[INFO] cloning repository https://github.com/Brychlikov/rps_cell
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Brychlikov/rps_cell" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBrychlikov%2Frps_cell", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBrychlikov%2Frps_cell'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b1319aacd821006c3e2354161d20fae8288c1e1c
[INFO] documenting Brychlikov/rps_cell against 1.46.0 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBrychlikov%2Frps_cell" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Brychlikov/rps_cell on toolchain 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Brychlikov/rps_cell
[INFO] finished tweaking git repo https://github.com/Brychlikov/rps_cell
[INFO] tweaked toml for git repo https://github.com/Brychlikov/rps_cell written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/Brychlikov/rps_cell already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8fe3f8b19e78c7c1341f58b87aa4041e0eeca74ed229e46cb4374b9a4c5bc82d
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "8fe3f8b19e78c7c1341f58b87aa4041e0eeca74ed229e46cb4374b9a4c5bc82d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8fe3f8b19e78c7c1341f58b87aa4041e0eeca74ed229e46cb4374b9a4c5bc82d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8fe3f8b19e78c7c1341f58b87aa4041e0eeca74ed229e46cb4374b9a4c5bc82d", kill_on_drop: false }`
[INFO] [stdout] 8fe3f8b19e78c7c1341f58b87aa4041e0eeca74ed229e46cb4374b9a4c5bc82d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8b842e51f565de2d6cbc08ba9f28e7d306ebda31c6a1b5f313ab217fa17fdb41
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "8b842e51f565de2d6cbc08ba9f28e7d306ebda31c6a1b5f313ab217fa17fdb41", kill_on_drop: false }`
[INFO] [stderr]     Checking piston-texture v0.8.0
[INFO] [stderr]     Checking itertools v0.8.1
[INFO] [stderr]    Compiling gl_generator v0.10.0
[INFO] [stderr]     Checking memmap v0.7.0
[INFO] [stderr]     Checking raw-window-handle v0.3.1
[INFO] [stderr]     Checking shared_library v0.1.9
[INFO] [stderr]     Checking ordered-float v1.0.2
[INFO] [stderr]     Checking approx v0.3.2
[INFO] [stderr]     Checking line_drawing v0.7.0
[INFO] [stderr]     Checking crossbeam-queue v0.2.0
[INFO] [stderr]    Compiling serde_derive v1.0.102
[INFO] [stderr]     Checking x11-dl v2.18.4
[INFO] [stderr]     Checking num-rational v0.2.2
[INFO] [stderr]     Checking num-iter v0.1.39
[INFO] [stderr]     Checking tiff v0.3.1
[INFO] [stderr]     Checking wayland-commons v0.21.13
[INFO] [stderr]     Checking osmesa-sys v0.1.2
[INFO] [stderr]     Checking rayon-core v1.6.1
[INFO] [stderr]     Checking rusttype v0.8.1
[INFO] [stderr]     Checking wayland-client v0.21.13
[INFO] [stderr]     Checking rayon v1.2.1
[INFO] [stderr]     Checking rusttype v0.7.9
[INFO] [stderr]     Checking andrew v0.2.1
[INFO] [stderr]     Checking piston2d-graphics v0.35.0
[INFO] [stderr]     Checking ndarray v0.13.0
[INFO] [stderr]    Compiling gl v0.11.0
[INFO] [stderr]     Checking wayland-protocols v0.21.13
[INFO] [stderr]     Checking glutin_glx_sys v0.1.5
[INFO] [stderr]     Checking jpeg-decoder v0.1.16
[INFO] [stderr]     Checking image v0.22.3
[INFO] [stderr]     Checking smithay-client-toolkit v0.4.6
[INFO] [stderr]     Checking winit v0.19.5
[INFO] [stderr]     Checking pistoncore-input v0.28.0
[INFO] [stderr]     Checking piston2d-opengl_graphics v0.69.0
[INFO] [stderr]     Checking glutin v0.21.1
[INFO] [stderr]     Checking pistoncore-window v0.44.0
[INFO] [stderr]     Checking pistoncore-event_loop v0.49.0
[INFO] [stderr]     Checking pistoncore-glutin_window v0.63.0
[INFO] [stderr]     Checking piston v0.49.0
[INFO] [stderr]  Documenting rps_cell 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(generators, generator_trait)]
[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 `rps_cell`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name rps_cell src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern ndarray=/opt/rustwide/target/debug/deps/libndarray-a140a31434eda955.rmeta --extern num_traits=/opt/rustwide/target/debug/deps/libnum_traits-1d4e95c5a8748d93.rmeta --extern piston=/opt/rustwide/target/debug/deps/libpiston-dfda79801fe4439c.rmeta --extern graphics=/opt/rustwide/target/debug/deps/libgraphics-2d3195bc64a1509d.rmeta --extern opengl_graphics=/opt/rustwide/target/debug/deps/libopengl_graphics-cfc8a382d93835d1.rmeta --extern glutin_window=/opt/rustwide/target/debug/deps/libglutin_window-7701acd4d8d43f28.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-b54d34981a20a6ef.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "8b842e51f565de2d6cbc08ba9f28e7d306ebda31c6a1b5f313ab217fa17fdb41", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8b842e51f565de2d6cbc08ba9f28e7d306ebda31c6a1b5f313ab217fa17fdb41", kill_on_drop: false }`
[INFO] [stdout] 8b842e51f565de2d6cbc08ba9f28e7d306ebda31c6a1b5f313ab217fa17fdb41