[INFO] fetching crate screenruster-saver 0.2.2...
[INFO] documenting screenruster-saver-0.2.2 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate screenruster-saver 0.2.2 into /workspace/builds/worker-14/source
[INFO] validating manifest of crates.io crate screenruster-saver 0.2.2 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 screenruster-saver 0.2.2
[INFO] finished tweaking crates.io crate screenruster-saver 0.2.2
[INFO] tweaked toml for crates.io crate screenruster-saver 0.2.2 written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] crate crates.io crate screenruster-saver 0.2.2 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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] b5c7aa8b8d9b5e0392092ad6559058ff9a4faa35ac231142a0e0b074a612443a
[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" "b5c7aa8b8d9b5e0392092ad6559058ff9a4faa35ac231142a0e0b074a612443a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b5c7aa8b8d9b5e0392092ad6559058ff9a4faa35ac231142a0e0b074a612443a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b5c7aa8b8d9b5e0392092ad6559058ff9a4faa35ac231142a0e0b074a612443a", kill_on_drop: false }`
[INFO] [stdout] b5c7aa8b8d9b5e0392092ad6559058ff9a4faa35ac231142a0e0b074a612443a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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] e962e6774181ebf3920eff68872621a21925d9fda6c992e2cf82d1b89358330a
[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" "e962e6774181ebf3920eff68872621a21925d9fda6c992e2cf82d1b89358330a", kill_on_drop: false }`
[INFO] [stderr]    Compiling xml-rs v0.8.0
[INFO] [stderr]     Checking exoquant v0.2.0
[INFO] [stderr]     Checking takeable-option v0.4.0
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling miniz-sys v0.1.12
[INFO] [stderr]    Compiling backtrace-sys v0.1.32
[INFO] [stderr]    Compiling x11 v2.18.1
[INFO] [stderr]     Checking crossbeam-channel v0.4.0
[INFO] [stderr]     Checking num-complex v0.1.43
[INFO] [stderr]    Compiling phf_generator v0.7.24
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]     Checking rayon-core v1.7.0
[INFO] [stderr]    Compiling phf_codegen v0.7.24
[INFO] [stderr]    Compiling palette v0.2.1
[INFO] [stderr]     Checking rayon v1.3.0
[INFO] [stderr]    Compiling gl_generator v0.11.0
[INFO] [stderr]     Checking flate2 v0.2.20
[INFO] [stderr]     Checking num-bigint v0.1.44
[INFO] [stderr]     Checking num-iter v0.1.39
[INFO] [stderr]     Checking backtrace v0.3.40
[INFO] [stderr]     Checking png v0.6.2
[INFO] [stderr]     Checking xyz v0.2.1
[INFO] [stderr]     Checking imagefmt v4.0.0
[INFO] [stderr]     Checking num-rational v0.1.42
[INFO] [stderr]    Compiling glium v0.25.1
[INFO] [stderr]     Checking num v0.1.42
[INFO] [stderr]     Checking jpeg-decoder v0.1.18
[INFO] [stderr]     Checking picto v0.4.3
[INFO] [stderr]  Documenting screenruster-saver v0.2.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:15:1
[INFO] [stdout]    |
[INFO] [stdout] 15 | #![feature(type_ascription)]
[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 `screenruster-saver`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name screenruster_saver src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --cfg 'feature="gl"' --cfg 'feature="picto"' --cfg 'feature="renderer"' --cfg 'feature="x11"' --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern crossbeam_channel=/opt/rustwide/target/debug/deps/libcrossbeam_channel-ae9f92bb8a42952a.rmeta --extern env_logger=/opt/rustwide/target/debug/deps/libenv_logger-d3e8fcb323833d29.rmeta --extern gl=/opt/rustwide/target/debug/deps/libglium-66068c9ba504a5c4.rmeta --extern json=/opt/rustwide/target/debug/deps/libjson-d698077bbef149d4.rmeta --extern libc=/opt/rustwide/target/debug/deps/liblibc-f2d7bce8c9fa4b7a.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-69d9a7f018cb28c7.rmeta --extern picto=/opt/rustwide/target/debug/deps/libpicto-b7a15b51d1d1d4c5.rmeta --extern x11=/opt/rustwide/target/debug/deps/libx11-9313498420d3be06.rmeta --cap-lints=warn --crate-version 0.2.2` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "e962e6774181ebf3920eff68872621a21925d9fda6c992e2cf82d1b89358330a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e962e6774181ebf3920eff68872621a21925d9fda6c992e2cf82d1b89358330a", kill_on_drop: false }`
[INFO] [stdout] e962e6774181ebf3920eff68872621a21925d9fda6c992e2cf82d1b89358330a