[INFO] crate screenruster-saver-hacks 0.2.0 is already in cache
[INFO] extracting crate screenruster-saver-hacks 0.2.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/screenruster-saver-hacks/0.2.0
[INFO] extracting crate screenruster-saver-hacks 0.2.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/screenruster-saver-hacks/0.2.0
[INFO] validating manifest of screenruster-saver-hacks-0.2.0 on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of screenruster-saver-hacks-0.2.0 on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing screenruster-saver-hacks-0.2.0
[INFO] finished frobbing screenruster-saver-hacks-0.2.0
[INFO] frobbed toml for screenruster-saver-hacks-0.2.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/screenruster-saver-hacks/0.2.0/Cargo.toml
[INFO] started frobbing screenruster-saver-hacks-0.2.0
[INFO] finished frobbing screenruster-saver-hacks-0.2.0
[INFO] frobbed toml for screenruster-saver-hacks-0.2.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/screenruster-saver-hacks/0.2.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing screenruster-saver-hacks-0.2.0 against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/screenruster-saver-hacks/0.2.0:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] bf14688ae310ee12510354545383b200ed0fd5d704b356987122e3c9b324874d
[INFO] running `"docker" "start" "-a" "bf14688ae310ee12510354545383b200ed0fd5d704b356987122e3c9b324874d"`
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling rand_core v0.4.2
[INFO] [stderr]    Compiling arrayvec v0.4.11
[INFO] [stderr]    Compiling siphasher v0.2.3
[INFO] [stderr]    Compiling nodrop v0.1.13
[INFO] [stderr]    Compiling scopeguard v1.0.0
[INFO] [stderr]    Compiling khronos_api v3.1.0
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]    Compiling rustc-serialize v0.3.24
[INFO] [stderr]    Compiling rayon-core v1.5.0
[INFO] [stderr]    Compiling xml-rs v0.8.0
[INFO] [stderr]    Compiling either v1.5.2
[INFO] [stderr]    Compiling adler32 v1.0.3
[INFO] [stderr]    Compiling inflate v0.1.1
[INFO] [stderr]    Compiling bitflags v0.7.0
[INFO] [stderr]    Compiling color_quant v1.0.1
[INFO] [stderr]    Compiling lzw v0.10.0
[INFO] [stderr]    Compiling quick-error v1.2.2
[INFO] [stderr]    Compiling approx v0.1.1
[INFO] [stderr]    Compiling regex-syntax v0.6.11
[INFO] [stderr]    Compiling exoquant v0.2.0
[INFO] [stderr]    Compiling termcolor v1.0.5
[INFO] [stderr]    Compiling smallvec v0.6.10
[INFO] [stderr]    Compiling takeable-option v0.4.0
[INFO] [stderr]    Compiling json v0.11.15
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling num-traits v0.2.8
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling crossbeam-utils v0.6.6
[INFO] [stderr]    Compiling num-iter v0.1.39
[INFO] [stderr]    Compiling thread_local v0.3.6
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling phf_shared v0.7.24
[INFO] [stderr]    Compiling rand_core v0.3.1
[INFO] [stderr]    Compiling rand_jitter v0.1.4
[INFO] [stderr]    Compiling x11 v2.18.1
[INFO] [stderr]    Compiling humantime v1.2.0
[INFO] [stderr]    Compiling gif v0.9.2
[INFO] [stderr]    Compiling crossbeam-queue v0.1.2
[INFO] [stderr]    Compiling crossbeam-channel v0.3.9
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]    Compiling phf v0.7.24
[INFO] [stderr]    Compiling rand_isaac v0.1.1
[INFO] [stderr]    Compiling rand_xorshift v0.1.1
[INFO] [stderr]    Compiling rand_hc v0.1.0
[INFO] [stderr]    Compiling rand_os v0.1.3
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling num_cpus v1.10.1
[INFO] [stderr]    Compiling atty v0.2.13
[INFO] [stderr]    Compiling dirs-sys v0.3.4
[INFO] [stderr]    Compiling deflate v0.7.20
[INFO] [stderr]    Compiling gl_generator v0.11.0
[INFO] [stderr]    Compiling memoffset v0.5.1
[INFO] [stderr]    Compiling aho-corasick v0.7.6
[INFO] [stderr]    Compiling dirs v2.0.2
[INFO] [stderr]    Compiling flate2 v0.2.20
[INFO] [stderr]    Compiling xyz v0.2.1
[INFO] [stderr]    Compiling imagefmt v4.0.0
[INFO] [stderr]    Compiling num-complex v0.1.43
[INFO] [stderr]    Compiling regex v1.2.1
[INFO] [stderr]    Compiling num-bigint v0.1.44
[INFO] [stderr]    Compiling glium v0.25.1
[INFO] [stderr]    Compiling crossbeam-epoch v0.7.2
[INFO] [stderr]    Compiling png v0.6.2
[INFO] [stderr]    Compiling crossbeam-deque v0.6.3
[INFO] [stderr]    Compiling phf_generator v0.7.24
[INFO] [stderr]    Compiling num-rational v0.1.42
[INFO] [stderr]    Compiling phf_codegen v0.7.24
[INFO] [stderr]    Compiling palette v0.2.1
[INFO] [stderr]    Compiling num v0.1.42
[INFO] [stderr]    Compiling env_logger v0.6.2
[INFO] [stderr]    Compiling rayon v1.1.0
[INFO] [stderr]    Compiling jpeg-decoder v0.1.15
[INFO] [stderr]    Compiling picto v0.4.3
[INFO] [stderr]    Compiling screenruster-saver v0.2.1
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/screenruster-saver-0.2.1/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] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "bf14688ae310ee12510354545383b200ed0fd5d704b356987122e3c9b324874d"`
[INFO] running `"docker" "rm" "-f" "bf14688ae310ee12510354545383b200ed0fd5d704b356987122e3c9b324874d"`
[INFO] [stdout] bf14688ae310ee12510354545383b200ed0fd5d704b356987122e3c9b324874d