[INFO] updating cached repository zackmdavis/Leafline
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/zackmdavis/Leafline
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/zackmdavis/Leafline" "work/ex/beta-1.38-1/sources/1.37.0/gh/zackmdavis/Leafline"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/zackmdavis/Leafline'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/zackmdavis/Leafline" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/zackmdavis/Leafline"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/zackmdavis/Leafline'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] c863da062df1ad690de0b7a7df03a4f19ee36345
[INFO] sha for GitHub repo zackmdavis/Leafline: c863da062df1ad690de0b7a7df03a4f19ee36345
[INFO] validating manifest of zackmdavis/Leafline 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 zackmdavis/Leafline 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 zackmdavis/Leafline
[INFO] finished frobbing zackmdavis/Leafline
[INFO] frobbed toml for zackmdavis/Leafline written to work/ex/beta-1.38-1/sources/1.37.0/gh/zackmdavis/Leafline/Cargo.toml
[INFO] started frobbing zackmdavis/Leafline
[INFO] finished frobbing zackmdavis/Leafline
[INFO] frobbed toml for zackmdavis/Leafline written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/zackmdavis/Leafline/Cargo.toml
[INFO] crate zackmdavis/Leafline 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 zackmdavis/Leafline 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-0/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/zackmdavis/Leafline:/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] 1aa38e30db403a2d18501e0ed2a0a68d411f25ed49f116adc3579160f4546ff9
[INFO] running `"docker" "start" "-a" "1aa38e30db403a2d18501e0ed2a0a68d411f25ed49f116adc3579160f4546ff9"`
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling rand_core v0.3.0
[INFO] [stderr]    Compiling void v1.0.2
[INFO] [stderr]    Compiling libc v0.2.43
[INFO] [stderr]    Compiling stable_deref_trait v1.0.0
[INFO] [stderr]    Compiling scopeguard v0.3.3
[INFO] [stderr]    Compiling linked-hash-map v0.0.9
[INFO] [stderr]    Compiling log v0.3.8
[INFO] [stderr]    Compiling rustc-serialize v0.3.24
[INFO] [stderr]    Compiling argparse v0.2.1
[INFO] [stderr]    Compiling itertools v0.4.19
[INFO] [stderr]    Compiling ansi_term v0.6.3
[INFO] [stderr]    Compiling unreachable v1.0.0
[INFO] [stderr]    Compiling owning_ref v0.3.3
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling lru-cache v0.0.7
[INFO] [stderr]    Compiling rand_core v0.2.2
[INFO] [stderr]    Compiling smallvec v0.6.5
[INFO] [stderr]    Compiling rand v0.3.15
[INFO] [stderr]    Compiling time v0.1.37
[INFO] [stderr]    Compiling lock_api v0.1.4
[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/lock_api-0.1.4/src/lib.rs:88:34
[INFO] [stderr]    |
[INFO] [stderr] 88 | #![cfg_attr(feature = "nightly", feature(const_fn))]
[INFO] [stderr]    |                                  ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]    Compiling rustc_version v0.2.3
[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 `lock_api`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "1aa38e30db403a2d18501e0ed2a0a68d411f25ed49f116adc3579160f4546ff9"`
[INFO] running `"docker" "rm" "-f" "1aa38e30db403a2d18501e0ed2a0a68d411f25ed49f116adc3579160f4546ff9"`
[INFO] [stdout] 1aa38e30db403a2d18501e0ed2a0a68d411f25ed49f116adc3579160f4546ff9