[INFO] fetching crate shadiertoy 0.1.0...
[INFO] documenting shadiertoy-0.1.0 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate shadiertoy 0.1.0 into /workspace/builds/worker-13/source
[INFO] validating manifest of crates.io crate shadiertoy 0.1.0 on toolchain beta-2020-08-29
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate shadiertoy 0.1.0
[INFO] finished tweaking crates.io crate shadiertoy 0.1.0
[INFO] tweaked toml for crates.io crate shadiertoy 0.1.0 written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "+beta-2020-08-29" "metadata" "--no-deps" "--format-version=1", 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] 5fefc09b7cebd4c79c93c5f43bfd4005812c7499137413e0ca24c3207dbd94d9
[INFO] running `Command { std: "docker" "start" "-a" "5fefc09b7cebd4c79c93c5f43bfd4005812c7499137413e0ca24c3207dbd94d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5fefc09b7cebd4c79c93c5f43bfd4005812c7499137413e0ca24c3207dbd94d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5fefc09b7cebd4c79c93c5f43bfd4005812c7499137413e0ca24c3207dbd94d9", kill_on_drop: false }`
[INFO] [stdout] 5fefc09b7cebd4c79c93c5f43bfd4005812c7499137413e0ca24c3207dbd94d9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "+beta-2020-08-29" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] aee1e5358a3b24aeaf8e6ffdc3b85cf55c35ee92487e2b32d80e6587d7d46ec6
[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" "aee1e5358a3b24aeaf8e6ffdc3b85cf55c35ee92487e2b32d80e6587d7d46ec6", kill_on_drop: false }`
[INFO] [stderr]     Checking draw_state v0.8.0
[INFO] [stderr]    Compiling gfx_gl v0.5.0
[INFO] [stderr]    Compiling glutin v0.16.0
[INFO] [stderr]    Compiling num-derive v0.2.5
[INFO] [stderr]     Checking parking_lot v0.5.5
[INFO] [stderr]     Checking png v0.12.0
[INFO] [stderr]     Checking winit v0.15.1
[INFO] [stderr]     Checking gfx_core v0.8.3
[INFO] [stderr]     Checking gfx v0.17.1
[INFO] [stderr]     Checking image v0.19.0
[INFO] [stderr]     Checking gfx_device_gl v0.15.5
[INFO] [stderr]     Checking gfx_window_glutin v0.24.0
[INFO] [stderr]  Documenting shadiertoy v0.1.0 (/opt/rustwide/workdir)
[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(use_extern_macros)]
[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 `shadiertoy`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name shadiertoy 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 gfx=/opt/rustwide/target/debug/deps/libgfx-ea1f49af00f7d2de.rmeta --extern gfx_device_gl=/opt/rustwide/target/debug/deps/libgfx_device_gl-8bd080aa944493a4.rmeta --extern gfx_window_glutin=/opt/rustwide/target/debug/deps/libgfx_window_glutin-e4f334d19e3d75ae.rmeta --extern glutin=/opt/rustwide/target/debug/deps/libglutin-ae7557efb14ade79.rmeta --extern image=/opt/rustwide/target/debug/deps/libimage-d1e90b8af31e81c1.rmeta --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "aee1e5358a3b24aeaf8e6ffdc3b85cf55c35ee92487e2b32d80e6587d7d46ec6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aee1e5358a3b24aeaf8e6ffdc3b85cf55c35ee92487e2b32d80e6587d7d46ec6", kill_on_drop: false }`
[INFO] [stdout] aee1e5358a3b24aeaf8e6ffdc3b85cf55c35ee92487e2b32d80e6587d7d46ec6