[INFO] crate screenruster-saver-hacks 0.2.1 is already in cache
[INFO] testing screenruster-saver-hacks-0.2.1 against 1.44.0 for beta-1.45-1
[INFO] extracting crate screenruster-saver-hacks 0.2.1 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate screenruster-saver-hacks 0.2.1 on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[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-8/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 `"/workspace/cargo-home/bin/cargo" "+1.44.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] db893604918ecb2789fdd589829e989283becb5f17374d7cc8afb44039183f04
[INFO] running `"docker" "start" "-a" "db893604918ecb2789fdd589829e989283becb5f17374d7cc8afb44039183f04"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling exoquant v0.2.0
[INFO] [stderr]    Compiling termcolor v1.0.5
[INFO] [stderr]    Compiling json v0.12.0
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling miniz-sys v0.1.12
[INFO] [stderr]    Compiling x11 v2.18.1
[INFO] [stderr]    Compiling getrandom v0.1.13
[INFO] [stderr]    Compiling dirs-sys v0.3.4
[INFO] [stderr]    Compiling num-complex v0.1.43
[INFO] [stderr]    Compiling glium v0.25.1
[INFO] [stderr]    Compiling phf_generator v0.7.24
[INFO] [stderr]    Compiling crossbeam-queue v0.2.1
[INFO] [stderr]    Compiling phf_codegen v0.7.24
[INFO] [stderr]    Compiling rayon-core v1.7.0
[INFO] [stderr]    Compiling dirs v2.0.2
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling palette v0.2.1
[INFO] [stderr]    Compiling env_logger v0.7.1
[INFO] [stderr]    Compiling rand_chacha v0.2.1
[INFO] [stderr]    Compiling rand v0.7.2
[INFO] [stderr]    Compiling flate2 v0.2.20
[INFO] [stderr]    Compiling num-bigint v0.1.44
[INFO] [stderr]    Compiling num-iter v0.1.39
[INFO] [stderr]    Compiling rayon v1.3.0
[INFO] [stderr]    Compiling png v0.6.2
[INFO] [stderr]    Compiling imagefmt v4.0.0
[INFO] [stderr]    Compiling xyz v0.2.1
[INFO] [stderr]    Compiling num-rational v0.1.42
[INFO] [stderr]    Compiling num v0.1.42
[INFO] [stderr]    Compiling jpeg-decoder v0.1.18
[INFO] [stderr]    Compiling picto v0.4.3
[INFO] [stderr]    Compiling screenruster-saver v0.2.2
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/screenruster-saver-0.2.2/src/lib.rs:15:1
[INFO] [stderr]    |
[INFO] [stderr] 15 | #![feature(type_ascription)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[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 `"docker" "inspect" "db893604918ecb2789fdd589829e989283becb5f17374d7cc8afb44039183f04"`
[INFO] running `"docker" "rm" "-f" "db893604918ecb2789fdd589829e989283becb5f17374d7cc8afb44039183f04"`
[INFO] [stdout] db893604918ecb2789fdd589829e989283becb5f17374d7cc8afb44039183f04