[INFO] updating cached repository kvinwang/astate
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/kvinwang/astate
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/kvinwang/astate" "work/ex/beta-1.38-1/sources/1.37.0/gh/kvinwang/astate"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/kvinwang/astate'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/kvinwang/astate" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/kvinwang/astate"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/kvinwang/astate'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 0b04c300dc321bb82a4ff8cbf2fe85a0adac019e
[INFO] sha for GitHub repo kvinwang/astate: 0b04c300dc321bb82a4ff8cbf2fe85a0adac019e
[INFO] validating manifest of kvinwang/astate 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 kvinwang/astate 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 kvinwang/astate
[INFO] finished frobbing kvinwang/astate
[INFO] frobbed toml for kvinwang/astate written to work/ex/beta-1.38-1/sources/1.37.0/gh/kvinwang/astate/Cargo.toml
[INFO] started frobbing kvinwang/astate
[INFO] finished frobbing kvinwang/astate
[INFO] frobbed toml for kvinwang/astate written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/kvinwang/astate/Cargo.toml
[INFO] crate kvinwang/astate 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 kvinwang/astate 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-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/kvinwang/astate:/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] 79908460793efa08644df9c50e79691b71cccd219b1f977001b817de65e17eeb
[INFO] running `"docker" "start" "-a" "79908460793efa08644df9c50e79691b71cccd219b1f977001b817de65e17eeb"`
[INFO] [stderr]    Compiling futures v0.1.27
[INFO] [stderr]    Compiling bytes v0.4.12
[INFO] [stderr]    Compiling tokio-io v0.2.0 (https://github.com/tokio-rs/tokio#d4adeeef)
[INFO] [stderr]    Compiling tokio-sync v0.1.6
[INFO] [stderr]    Compiling tokio-executor v0.2.0 (https://github.com/tokio-rs/tokio#d4adeeef)
[INFO] [stderr]    Compiling tokio-sync v0.2.0 (https://github.com/tokio-rs/tokio#d4adeeef)
[INFO] [stderr]    Compiling tokio-io v0.1.12
[INFO] [stderr]    Compiling tokio-executor v0.1.7
[INFO] [stderr]    Compiling tokio-threadpool v0.2.0 (https://github.com/tokio-rs/tokio#d4adeeef)
[INFO] [stderr]    Compiling tokio-timer v0.3.0 (https://github.com/tokio-rs/tokio#d4adeeef)
[INFO] [stderr]    Compiling tokio-current-thread v0.2.0 (https://github.com/tokio-rs/tokio#d4adeeef)
[INFO] [stderr]    Compiling tokio-codec v0.2.0 (https://github.com/tokio-rs/tokio#d4adeeef)
[INFO] [stderr]    Compiling tokio-futures v0.2.0 (https://github.com/tokio-rs/tokio#d4adeeef)
[INFO] [stderr]    Compiling tokio-codec v0.1.1
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> /opt/crater/cargo-home/git/checkouts/tokio-377c595163f99a10/d4adeee/tokio-futures/src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(async_await, await_macro)]
[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 `tokio-futures`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "79908460793efa08644df9c50e79691b71cccd219b1f977001b817de65e17eeb"`
[INFO] running `"docker" "rm" "-f" "79908460793efa08644df9c50e79691b71cccd219b1f977001b817de65e17eeb"`
[INFO] [stdout] 79908460793efa08644df9c50e79691b71cccd219b1f977001b817de65e17eeb