[INFO] fetching crate screenruster-saver-hacks 0.2.1...
[INFO] documenting screenruster-saver-hacks-0.2.1 against beta-2021-08-01 for beta-1.55-rustdoc-1
[INFO] extracting crate screenruster-saver-hacks 0.2.1 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate screenruster-saver-hacks 0.2.1 on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate screenruster-saver-hacks 0.2.1
[INFO] finished tweaking crates.io crate screenruster-saver-hacks 0.2.1
[INFO] tweaked toml for crates.io crate screenruster-saver-hacks 0.2.1 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate crates.io crate screenruster-saver-hacks 0.2.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded picto v0.4.3
[INFO] [stderr]   Downloaded screenruster-saver v0.2.2
[INFO] [stderr]   Downloaded xyz v0.2.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0a6a7132f0adfe4c32f79121507e07ae05079bb6b675bab1a8cd68e619e778cb
[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" "0a6a7132f0adfe4c32f79121507e07ae05079bb6b675bab1a8cd68e619e778cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0a6a7132f0adfe4c32f79121507e07ae05079bb6b675bab1a8cd68e619e778cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0a6a7132f0adfe4c32f79121507e07ae05079bb6b675bab1a8cd68e619e778cb", kill_on_drop: false }`
[INFO] [stdout] 0a6a7132f0adfe4c32f79121507e07ae05079bb6b675bab1a8cd68e619e778cb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9da8c1a56c91f65831d99194b61fbd3e4e2186171a78281dd31df6fd30b5fef7
[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" "9da8c1a56c91f65831d99194b61fbd3e4e2186171a78281dd31df6fd30b5fef7", kill_on_drop: false }`
[INFO] [stderr]    Compiling cc v1.0.48
[INFO] [stderr]     Checking approx v0.1.1
[INFO] [stderr]     Checking regex-syntax v0.6.12
[INFO] [stderr]     Checking exoquant v0.2.0
[INFO] [stderr]     Checking takeable-option v0.4.0
[INFO] [stderr]     Checking termcolor v1.0.5
[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 num-iter v0.1.39
[INFO] [stderr]    Compiling x11 v2.18.1
[INFO] [stderr]    Compiling libc v0.2.66
[INFO] [stderr]     Checking getrandom v0.1.13
[INFO] [stderr]    Compiling gl_generator v0.11.0
[INFO] [stderr]     Checking rayon-core v1.7.0
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.1
[INFO] [stderr]     Checking rayon v1.3.0
[INFO] [stderr]    Compiling rand_os v0.1.3
[INFO] [stderr]     Checking rand v0.7.2
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling miniz-sys v0.1.12
[INFO] [stderr]    Compiling backtrace-sys v0.1.32
[INFO] [stderr]    Compiling glium v0.25.1
[INFO] [stderr]     Checking num-complex v0.1.43
[INFO] [stderr]     Checking flate2 v0.2.20
[INFO] [stderr]    Compiling phf_generator v0.7.24
[INFO] [stderr]     Checking num-bigint v0.1.44
[INFO] [stderr]     Checking regex v1.3.1
[INFO] [stderr]    Compiling phf_codegen v0.7.24
[INFO] [stderr]     Checking backtrace v0.3.40
[INFO] [stderr]     Checking imagefmt v4.0.0
[INFO] [stderr]     Checking xyz v0.2.1
[INFO] [stderr]     Checking png v0.6.2
[INFO] [stderr]     Checking jpeg-decoder v0.1.18
[INFO] [stderr]    Compiling palette v0.2.1
[INFO] [stderr]     Checking num-rational v0.1.42
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]     Checking num v0.1.42
[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` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "9da8c1a56c91f65831d99194b61fbd3e4e2186171a78281dd31df6fd30b5fef7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9da8c1a56c91f65831d99194b61fbd3e4e2186171a78281dd31df6fd30b5fef7", kill_on_drop: false }`
[INFO] [stdout] 9da8c1a56c91f65831d99194b61fbd3e4e2186171a78281dd31df6fd30b5fef7
