[INFO] cloning repository https://github.com/stevebob/platform-game-experiment
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/stevebob/platform-game-experiment" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fstevebob%2Fplatform-game-experiment", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fstevebob%2Fplatform-game-experiment'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b182295c312d212b39a6e090c3221e6364a0145a
[INFO] documenting stevebob/platform-game-experiment 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%2Fstevebob%2Fplatform-game-experiment" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/stevebob/platform-game-experiment 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/stevebob/platform-game-experiment
[INFO] finished tweaking git repo https://github.com/stevebob/platform-game-experiment
[INFO] tweaked toml for git repo https://github.com/stevebob/platform-game-experiment written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/stevebob/platform-game-experiment 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]  Downloading crates ...
[INFO] [stderr]   Downloaded best v0.6.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] 6082e844858a975d12fb9907a2fee8dc4be2ad1d7dc91ae5780214aa13a97dc1
[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" "6082e844858a975d12fb9907a2fee8dc4be2ad1d7dc91ae5780214aa13a97dc1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6082e844858a975d12fb9907a2fee8dc4be2ad1d7dc91ae5780214aa13a97dc1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6082e844858a975d12fb9907a2fee8dc4be2ad1d7dc91ae5780214aa13a97dc1", kill_on_drop: false }`
[INFO] [stdout] 6082e844858a975d12fb9907a2fee8dc4be2ad1d7dc91ae5780214aa13a97dc1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] c5216ab9c034083c45de83622d20c8e962804b4b0e273b07d249ba64f6e86ee8
[INFO] running `Command { std: "docker" "start" "-a" "c5216ab9c034083c45de83622d20c8e962804b4b0e273b07d249ba64f6e86ee8", kill_on_drop: false }`
[INFO] [stderr]    Compiling bitflags v1.0.3
[INFO] [stderr]    Compiling cfg-if v0.1.3
[INFO] [stderr]    Compiling num-traits v0.2.5
[INFO] [stderr]     Checking token_store v0.1.2
[INFO] [stderr]    Compiling num-integer v0.1.39
[INFO] [stderr]    Compiling either v1.5.0
[INFO] [stderr]    Compiling quote v0.3.15
[INFO] [stderr]    Compiling unicode-xid v0.0.4
[INFO] [stderr]    Compiling num-bigint v0.2.0
[INFO] [stderr]    Compiling num-iter v0.1.37
[INFO] [stderr]    Compiling num-rational v0.2.1
[INFO] [stderr]    Compiling num-complex v0.2.0
[INFO] [stderr]     Checking custom_derive v0.1.7
[INFO] [stderr]    Compiling libloading v0.5.0
[INFO] [stderr]    Compiling x11-dl v2.18.0
[INFO] [stderr]     Checking memmap v0.6.2
[INFO] [stderr]     Checking log v0.4.2
[INFO] [stderr]     Checking draw_state v0.8.0
[INFO] [stderr]     Checking shared_library v0.1.8
[INFO] [stderr]    Compiling proc-macro2 v0.4.6
[INFO] [stderr]     Checking tempfile v3.0.2
[INFO] [stderr]    Compiling xml-rs v0.7.0
[INFO] [stderr]    Compiling itertools v0.5.10
[INFO] [stderr]    Compiling newtype_derive v0.1.6
[INFO] [stderr]    Compiling syn v0.10.8
[INFO] [stderr]     Checking osmesa-sys v0.1.2
[INFO] [stderr]    Compiling quote v0.6.3
[INFO] [stderr]    Compiling syn v0.14.2
[INFO] [stderr]     Checking dlib v0.4.1
[INFO] [stderr]    Compiling wayland-scanner v0.12.5
[INFO] [stderr]    Compiling gl_generator v0.9.0
[INFO] [stderr]     Checking wayland-sys v0.12.5
[INFO] [stderr]    Compiling wayland-client v0.12.5
[INFO] [stderr]    Compiling wayland-protocols v0.12.5
[INFO] [stderr]     Checking num-traits v0.1.43
[INFO] [stderr]     Checking cgmath v0.16.1
[INFO] [stderr]    Compiling gfx_gl v0.5.0
[INFO] [stderr]    Compiling glutin v0.15.0
[INFO] [stderr]    Compiling serde_derive v1.0.66
[INFO] [stderr]    Compiling derivative v1.0.0
[INFO] [stderr]     Checking num v0.2.0
[INFO] [stderr]     Checking wayland-kbd v0.13.1
[INFO] [stderr]     Checking wayland-window v0.13.3
[INFO] [stderr]     Checking winit v0.13.1
[INFO] [stderr]     Checking gfx_core v0.8.2
[INFO] [stderr]     Checking gfx_device_gl v0.15.3
[INFO] [stderr]     Checking gfx v0.17.1
[INFO] [stderr]     Checking gfx_window_glutin v0.23.0
[INFO] [stderr]     Checking best v0.6.0
[INFO] [stderr]  Documenting platform-game-experiment 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:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(nonzero)]
[INFO] [stdout]   |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `platform-game-experiment`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type bin --crate-name platform_game_experiment src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=54547cafcaea2328 -L dependency=/opt/rustwide/target/debug/deps --extern best=/opt/rustwide/target/debug/deps/libbest-16c4c86c0f1e6588.rmeta --extern cgmath=/opt/rustwide/target/debug/deps/libcgmath-60edbe009de2af74.rmeta --extern custom_derive=/opt/rustwide/target/debug/deps/libcustom_derive-70b6958c860d531e.rmeta --extern fnv=/opt/rustwide/target/debug/deps/libfnv-8d39421456a55906.rmeta --extern gfx=/opt/rustwide/target/debug/deps/libgfx-af6f9ddf5e48c1a4.rmeta --extern gfx_device_gl=/opt/rustwide/target/debug/deps/libgfx_device_gl-515dd46fab925948.rmeta --extern gfx_window_glutin=/opt/rustwide/target/debug/deps/libgfx_window_glutin-40804601aaa23d9e.rmeta --extern glutin=/opt/rustwide/target/debug/deps/libglutin-97143a8b204566f0.rmeta --extern newtype_derive=/opt/rustwide/target/debug/deps/libnewtype_derive-d35a6c0950866718.rmeta --extern num=/opt/rustwide/target/debug/deps/libnum-0f5638bbebc5551c.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "c5216ab9c034083c45de83622d20c8e962804b4b0e273b07d249ba64f6e86ee8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c5216ab9c034083c45de83622d20c8e962804b4b0e273b07d249ba64f6e86ee8", kill_on_drop: false }`
[INFO] [stdout] c5216ab9c034083c45de83622d20c8e962804b4b0e273b07d249ba64f6e86ee8