[INFO] fetching crate screenruster-saver-laughing_man 0.2.1...
[INFO] documenting screenruster-saver-laughing_man-0.2.1 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate screenruster-saver-laughing_man 0.2.1 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate screenruster-saver-laughing_man 0.2.1 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-laughing_man 0.2.1
[INFO] finished tweaking crates.io crate screenruster-saver-laughing_man 0.2.1
[INFO] tweaked toml for crates.io crate screenruster-saver-laughing_man 0.2.1 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate crates.io crate screenruster-saver-laughing_man 0.2.1 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 exoquant v0.2.0
[INFO] [stderr]   Downloaded screenruster-saver v0.2.2
[INFO] [stderr]   Downloaded xyz v0.2.1
[INFO] [stderr]   Downloaded picto v0.4.3
[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" "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] 90818d8bd3f245aeaa4c215477cc34b8089022bbcd7228792a1409316fbc0873
[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" "90818d8bd3f245aeaa4c215477cc34b8089022bbcd7228792a1409316fbc0873", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "90818d8bd3f245aeaa4c215477cc34b8089022bbcd7228792a1409316fbc0873", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "90818d8bd3f245aeaa4c215477cc34b8089022bbcd7228792a1409316fbc0873", kill_on_drop: false }`
[INFO] [stdout] 90818d8bd3f245aeaa4c215477cc34b8089022bbcd7228792a1409316fbc0873
[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" "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] b8ad372b0501d12f3ba07eb931b544e4d37b0908908a915b995a654714c09972
[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" "b8ad372b0501d12f3ba07eb931b544e4d37b0908908a915b995a654714c09972", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking inflate v0.1.1
[INFO] [stderr]     Checking takeable-option v0.4.0
[INFO] [stderr]     Checking exoquant v0.2.0
[INFO] [stderr]     Checking json v0.12.0
[INFO] [stderr]    Compiling num-traits v0.2.10
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling x11 v2.18.1
[INFO] [stderr]    Compiling miniz-sys v0.1.12
[INFO] [stderr]    Compiling rand_os v0.1.3
[INFO] [stderr]     Checking getrandom v0.1.13
[INFO] [stderr]    Compiling gl_generator v0.11.0
[INFO] [stderr]     Checking crossbeam-queue v0.2.1
[INFO] [stderr]     Checking backtrace-sys v0.1.32
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]     Checking backtrace v0.3.40
[INFO] [stderr]     Checking rayon-core v1.7.0
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]     Checking rand_chacha v0.2.1
[INFO] [stderr]     Checking rand v0.7.2
[INFO] [stderr]     Checking flate2 v0.2.20
[INFO] [stderr]     Checking rayon v1.3.0
[INFO] [stderr]    Compiling glium v0.25.1
[INFO] [stderr]     Checking num-complex v0.1.43
[INFO] [stderr]     Checking approx v0.3.2
[INFO] [stderr]     Checking num-complex v0.2.3
[INFO] [stderr]     Checking xyz v0.2.1
[INFO] [stderr]     Checking imagefmt v4.0.0
[INFO] [stderr]    Compiling phf_generator v0.7.24
[INFO] [stderr]     Checking num-iter v0.1.39
[INFO] [stderr]     Checking num-bigint v0.1.44
[INFO] [stderr]     Checking num-rational v0.2.2
[INFO] [stderr]    Compiling phf_codegen v0.7.24
[INFO] [stderr]     Checking rand_distr v0.2.2
[INFO] [stderr]     Checking png v0.6.2
[INFO] [stderr]     Checking alga v0.9.2
[INFO] [stderr]    Compiling palette v0.2.1
[INFO] [stderr]     Checking num-rational v0.1.42
[INFO] [stderr]     Checking num v0.1.42
[INFO] [stderr]     Checking nalgebra v0.19.0
[INFO] [stderr]     Checking jpeg-decoder v0.1.18
[INFO] [stderr]     Checking picto v0.4.3
[INFO] [stderr]     Checking screenruster-saver v0.2.2
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/screenruster-saver-0.2.2/src/lib.rs:15:1
[INFO] [stdout]    |
[INFO] [stdout] 15 | #![feature(type_ascription)]
[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 compile `screenruster-saver`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "b8ad372b0501d12f3ba07eb931b544e4d37b0908908a915b995a654714c09972", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b8ad372b0501d12f3ba07eb931b544e4d37b0908908a915b995a654714c09972", kill_on_drop: false }`
[INFO] [stdout] b8ad372b0501d12f3ba07eb931b544e4d37b0908908a915b995a654714c09972