[INFO] cloning repository https://github.com/marco9999/chip8-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/marco9999/chip8-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmarco9999%2Fchip8-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmarco9999%2Fchip8-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b748cdbfd31515ed3a220dc44131a0ece0c7f008
[INFO] documenting marco9999/chip8-rs against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmarco9999%2Fchip8-rs" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/marco9999/chip8-rs 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 git repo https://github.com/marco9999/chip8-rs
[INFO] finished tweaking git repo https://github.com/marco9999/chip8-rs
[INFO] tweaked toml for git repo https://github.com/marco9999/chip8-rs written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/marco9999/chip8-rs already has a lockfile, it will not be regenerated
[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]  Downloading crates ...
[INFO] [stderr]   Downloaded itoa v0.3.2
[INFO] [stderr]   Downloaded serde_yaml v0.7.1
[INFO] [stderr]   Downloaded futures v0.1.15
[INFO] [stderr]   Downloaded gcc v0.3.53
[INFO] [stderr]   Downloaded smallvec v0.4.3
[INFO] [stderr]   Downloaded parking_lot_core v0.2.4
[INFO] [stderr]   Downloaded parking_lot v0.4.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] [stdout] 311a5c98c2acd0de3ec70f3492324c34502b22c2367beca70497275bdb97079f
[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" "311a5c98c2acd0de3ec70f3492324c34502b22c2367beca70497275bdb97079f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "311a5c98c2acd0de3ec70f3492324c34502b22c2367beca70497275bdb97079f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "311a5c98c2acd0de3ec70f3492324c34502b22c2367beca70497275bdb97079f", kill_on_drop: false }`
[INFO] [stdout] 311a5c98c2acd0de3ec70f3492324c34502b22c2367beca70497275bdb97079f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] e1cfa584caf9e506f70b56bea10766dd7712b0aab5109f0d84f06265faafdef6
[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" "e1cfa584caf9e506f70b56bea10766dd7712b0aab5109f0d84f06265faafdef6", kill_on_drop: false }`
[INFO] [stderr]    Compiling gcc v0.3.53
[INFO] [stderr]     Checking linked-hash-map v0.3.0
[INFO] [stderr]    Compiling sdl2-sys v0.30.0
[INFO] [stderr]     Checking itoa v0.3.2
[INFO] [stderr]     Checking smallvec v0.4.3
[INFO] [stderr]     Checking stable_deref_trait v1.0.0
[INFO] [stderr]     Checking linked-hash-map v0.4.2
[INFO] [stderr]     Checking quick-error v1.2.0
[INFO] [stderr]     Checking futures v0.1.15
[INFO] [stderr]     Checking log-mdc v0.1.0
[INFO] [stderr]     Checking crossbeam v0.2.10
[INFO] [stderr]    Compiling chip8_rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking time v0.1.38
[INFO] [stderr]     Checking num_cpus v1.6.2
[INFO] [stderr]     Checking num-complex v0.1.40
[INFO] [stderr]     Checking bincode v0.8.0
[INFO] [stderr]     Checking num-bigint v0.1.40
[INFO] [stderr]     Checking ordered-float v0.5.0
[INFO] [stderr]     Checking owning_ref v0.3.3
[INFO] [stderr]     Checking humantime v1.0.0
[INFO] [stderr]     Checking serde_json v1.0.2
[INFO] [stderr]     Checking parking_lot_core v0.2.4
[INFO] [stderr]     Checking yaml-rust v0.3.5
[INFO] [stderr]     Checking serde-value v0.5.1
[INFO] [stderr]     Checking parking_lot v0.4.5
[INFO] [stderr]     Checking serde_yaml v0.7.1
[INFO] [stderr]    Compiling miniz-sys v0.1.9
[INFO] [stderr]     Checking num-rational v0.1.39
[INFO] [stderr]     Checking num v0.1.40
[INFO] [stderr]     Checking chrono v0.3.0
[INFO] [stderr]     Checking sdl2 v0.30.0
[INFO] [stderr]     Checking futures-cpupool v0.1.5
[INFO] [stderr]     Checking flate2 v0.2.19
[INFO] [stderr]     Checking log4rs v0.7.0
[INFO] [stderr]  Documenting chip8_rs 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:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(const_fn)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[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(associated_type_defaults)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 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 `chip8_rs`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name chip8_rs 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 bincode=/opt/rustwide/target/debug/deps/libbincode-bb5c40c3746a3d67.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-1abf0c9637b271c0.rmeta --extern futures_cpupool=/opt/rustwide/target/debug/deps/libfutures_cpupool-9c6324f2dccb2c2c.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-e8073698be3683f7.rmeta --extern log4rs=/opt/rustwide/target/debug/deps/liblog4rs-2f9045518b46c343.rmeta --extern num=/opt/rustwide/target/debug/deps/libnum-cb8f5e964fa636ab.rmeta --extern parking_lot=/opt/rustwide/target/debug/deps/libparking_lot-54826eaaed0ba4e3.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-f630e2e0005e15c7.rmeta --extern sdl2=/opt/rustwide/target/debug/deps/libsdl2-37971ad15408ed44.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-03a2218f76e6f902.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-ee1d607f9c99a775.so --cap-lints=warn --crate-version 0.1.0 --cfg 'build="debug"'` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "e1cfa584caf9e506f70b56bea10766dd7712b0aab5109f0d84f06265faafdef6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e1cfa584caf9e506f70b56bea10766dd7712b0aab5109f0d84f06265faafdef6", kill_on_drop: false }`
[INFO] [stdout] e1cfa584caf9e506f70b56bea10766dd7712b0aab5109f0d84f06265faafdef6