[INFO] updating cached repository kokeshing/strict_weak_order_rust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/kokeshing/strict_weak_order_rust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/kokeshing/strict_weak_order_rust" "work/ex/beta-1.38-1/sources/1.37.0/gh/kokeshing/strict_weak_order_rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/kokeshing/strict_weak_order_rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/kokeshing/strict_weak_order_rust" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/kokeshing/strict_weak_order_rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/kokeshing/strict_weak_order_rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 2bab80461e56b061848445201754627943b2280a
[INFO] sha for GitHub repo kokeshing/strict_weak_order_rust: 2bab80461e56b061848445201754627943b2280a
[INFO] validating manifest of kokeshing/strict_weak_order_rust 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 kokeshing/strict_weak_order_rust 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 kokeshing/strict_weak_order_rust
[INFO] finished frobbing kokeshing/strict_weak_order_rust
[INFO] frobbed toml for kokeshing/strict_weak_order_rust written to work/ex/beta-1.38-1/sources/1.37.0/gh/kokeshing/strict_weak_order_rust/Cargo.toml
[INFO] started frobbing kokeshing/strict_weak_order_rust
[INFO] finished frobbing kokeshing/strict_weak_order_rust
[INFO] frobbed toml for kokeshing/strict_weak_order_rust written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/kokeshing/strict_weak_order_rust/Cargo.toml
[INFO] crate kokeshing/strict_weak_order_rust 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 kokeshing/strict_weak_order_rust 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-7/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/kokeshing/strict_weak_order_rust:/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] 663b7ff0f09e81e6d17326c72b9bb404c9ee57bab4876f0285d095ac48572aee
[INFO] running `"docker" "start" "-a" "663b7ff0f09e81e6d17326c72b9bb404c9ee57bab4876f0285d095ac48572aee"`
[INFO] [stderr]    Compiling is_sorted v0.1.0
[INFO] [stderr] error[E0658]: use of unstable library feature 'is_sorted': new API
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/is_sorted-0.1.0/src/lib.rs:119:31
[INFO] [stderr]     |
[INFO] [stderr] 119 |         self.map(|v| key(&v)).is_sorted()
[INFO] [stderr]     |                               ^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: for more information, see https://github.com/rust-lang/rust/issues/53485
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0658`.
[INFO] [stderr] error: Could not compile `is_sorted`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "663b7ff0f09e81e6d17326c72b9bb404c9ee57bab4876f0285d095ac48572aee"`
[INFO] running `"docker" "rm" "-f" "663b7ff0f09e81e6d17326c72b9bb404c9ee57bab4876f0285d095ac48572aee"`
[INFO] [stdout] 663b7ff0f09e81e6d17326c72b9bb404c9ee57bab4876f0285d095ac48572aee