[INFO] updating cached repository iseurie/parcandidates
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/iseurie/parcandidates
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/iseurie/parcandidates" "work/ex/beta-1.38-1/sources/1.37.0/gh/iseurie/parcandidates"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/iseurie/parcandidates'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/iseurie/parcandidates" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/iseurie/parcandidates"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/iseurie/parcandidates'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] efb06f622c4445a2086fadca72e2cf079ccb0703
[INFO] sha for GitHub repo iseurie/parcandidates: efb06f622c4445a2086fadca72e2cf079ccb0703
[INFO] validating manifest of iseurie/parcandidates 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 iseurie/parcandidates 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 iseurie/parcandidates
[INFO] finished frobbing iseurie/parcandidates
[INFO] frobbed toml for iseurie/parcandidates written to work/ex/beta-1.38-1/sources/1.37.0/gh/iseurie/parcandidates/Cargo.toml
[INFO] started frobbing iseurie/parcandidates
[INFO] finished frobbing iseurie/parcandidates
[INFO] frobbed toml for iseurie/parcandidates written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/iseurie/parcandidates/Cargo.toml
[INFO] crate iseurie/parcandidates already has a lockfile, it will not be regenerated
[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 iseurie/parcandidates 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-6/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/iseurie/parcandidates:/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] 73c9239fdc069a1588dcc0b29924ffd800f9cb6bca80dd80cf6e7896bf97d60d
[INFO] running `"docker" "start" "-a" "73c9239fdc069a1588dcc0b29924ffd800f9cb6bca80dd80cf6e7896bf97d60d"`
[INFO] [stderr]    Compiling libc v0.2.38
[INFO] [stderr]    Compiling num-traits v0.2.1
[INFO] [stderr]    Compiling openssl-sys v0.9.27
[INFO] [stderr]    Compiling tendril v0.3.1
[INFO] [stderr]    Compiling openssl v0.9.24
[INFO] [stderr]    Compiling serde_json v1.0.10
[INFO] [stderr]    Compiling rand v0.4.2
[INFO] [stderr]    Compiling iovec v0.1.2
[INFO] [stderr]    Compiling net2 v0.2.32
[INFO] [stderr]    Compiling num_cpus v1.8.0
[INFO] [stderr]    Compiling time v0.1.39
[INFO] [stderr]    Compiling memchr v2.0.1
[INFO] [stderr]    Compiling bytes v0.4.6
[INFO] [stderr]    Compiling futures-cpupool v0.1.8
[INFO] [stderr]    Compiling aho-corasick v0.6.4
[INFO] [stderr]    Compiling mio v0.6.13
[INFO] [stderr]    Compiling regex v0.2.6
[INFO] [stderr]    Compiling tokio-io v0.1.5
[INFO] [stderr]    Compiling rand v0.3.22
[INFO] [stderr]    Compiling phf_generator v0.7.21
[INFO] [stderr]    Compiling uuid v0.5.1
[INFO] [stderr]    Compiling string_cache_codegen v0.4.0
[INFO] [stderr]    Compiling phf_codegen v0.7.21
[INFO] [stderr]    Compiling tokio-core v0.1.12
[INFO] [stderr]    Compiling mime_guess v2.0.0-alpha.4
[INFO] [stderr]    Compiling string_cache v0.6.2
[INFO] [stderr]    Compiling markup5ever v0.3.2
[INFO] [stderr]    Compiling tokio-proto v0.1.1
[INFO] [stderr]    Compiling native-tls v0.1.5
[INFO] [stderr]    Compiling tokio-tls v0.1.4
[INFO] [stderr]    Compiling hyper v0.11.21
[INFO] [stderr]    Compiling html5ever v0.18.0
[INFO] [stderr]    Compiling select v0.4.2
[INFO] [stderr]    Compiling hyper-tls v0.1.2
[INFO] [stderr]    Compiling reqwest v0.8.5
[INFO] [stderr]    Compiling parcandidates v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(conservative_impl_trait, universal_impl_trait)]
[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 `parcandidates`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "73c9239fdc069a1588dcc0b29924ffd800f9cb6bca80dd80cf6e7896bf97d60d"`
[INFO] running `"docker" "rm" "-f" "73c9239fdc069a1588dcc0b29924ffd800f9cb6bca80dd80cf6e7896bf97d60d"`
[INFO] [stdout] 73c9239fdc069a1588dcc0b29924ffd800f9cb6bca80dd80cf6e7896bf97d60d