[INFO] updating cached repository carbon-bond/carbonbond
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/carbon-bond/carbonbond
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/carbon-bond/carbonbond" "work/ex/beta-1.38-1/sources/1.37.0/gh/carbon-bond/carbonbond"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/carbon-bond/carbonbond'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/carbon-bond/carbonbond" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/carbon-bond/carbonbond"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/carbon-bond/carbonbond'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 5dd2a8408c138fa81026d78950768412b546c042
[INFO] sha for GitHub repo carbon-bond/carbonbond: 5dd2a8408c138fa81026d78950768412b546c042
[INFO] validating manifest of carbon-bond/carbonbond 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 carbon-bond/carbonbond 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 carbon-bond/carbonbond
[INFO] disabled cargo feature 'default-run' from carbon-bond/carbonbond
[INFO] finished frobbing carbon-bond/carbonbond
[INFO] frobbed toml for carbon-bond/carbonbond written to work/ex/beta-1.38-1/sources/1.37.0/gh/carbon-bond/carbonbond/Cargo.toml
[INFO] started frobbing carbon-bond/carbonbond
[INFO] disabled cargo feature 'default-run' from carbon-bond/carbonbond
[INFO] finished frobbing carbon-bond/carbonbond
[INFO] frobbed toml for carbon-bond/carbonbond written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/carbon-bond/carbonbond/Cargo.toml
[INFO] crate carbon-bond/carbonbond 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 carbon-bond/carbonbond against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/carbon-bond/carbonbond:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 296926bea7eb1f76bef0b80ddd5fe4cdf95d7b78bd3a767da52047853d640cdc
[INFO] running `"docker" "start" "-a" "296926bea7eb1f76bef0b80ddd5fe4cdf95d7b78bd3a767da52047853d640cdc"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling syn v0.15.40
[INFO] [stderr]    Compiling rand_chacha v0.2.0
[INFO] [stderr]    Compiling ring v0.14.6
[INFO] [stderr]    Compiling thread-id v3.3.0
[INFO] [stderr]    Compiling getrandom v0.1.6
[INFO] [stderr]    Compiling hostname v0.1.5
[INFO] [stderr]    Compiling socket2 v0.3.9
[INFO] [stderr]    Compiling signal-hook-registry v1.0.1
[INFO] [stderr]    Compiling rand v0.5.6
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling backtrace-sys v0.1.31
[INFO] [stderr]    Compiling miniz-sys v0.1.12
[INFO] [stderr]    Compiling crossbeam-channel v0.3.8
[INFO] [stderr]    Compiling brotli-sys v0.3.2
[INFO] [stderr]    Compiling bytes v0.4.12
[INFO] [stderr]    Compiling mio v0.6.19
[INFO] [stderr]    Compiling threadpool v1.7.1
[INFO] [stderr]    Compiling thread_local v0.3.3
[INFO] [stderr]    Compiling resolv-conf v0.6.2
[INFO] [stderr]    Compiling crossbeam-epoch v0.6.1
[INFO] [stderr]    Compiling blake2-rfc v0.2.18
[INFO] [stderr]    Compiling clap v2.33.0
[INFO] [stderr]    Compiling backtrace v0.3.33
[INFO] [stderr]    Compiling rand_core v0.5.0
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling flate2 v1.0.9
[INFO] [stderr]    Compiling brotli2 v0.3.2
[INFO] [stderr]    Compiling parking_lot_core v0.6.2
[INFO] [stderr]    Compiling signal-hook v0.1.10
[INFO] [stderr]    Compiling regex v1.0.2
[INFO] [stderr]    Compiling state v0.4.1
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/state-0.4.1/src/lib.rs:1:35
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![cfg_attr(feature = "const_fn", feature(const_fn))]
[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]    Compiling crossbeam-deque v0.6.3
[INFO] [stderr] error: Could not compile `state`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "296926bea7eb1f76bef0b80ddd5fe4cdf95d7b78bd3a767da52047853d640cdc"`
[INFO] running `"docker" "rm" "-f" "296926bea7eb1f76bef0b80ddd5fe4cdf95d7b78bd3a767da52047853d640cdc"`
[INFO] [stdout] 296926bea7eb1f76bef0b80ddd5fe4cdf95d7b78bd3a767da52047853d640cdc