[INFO] updating cached repository mit-pdos/distributary-mysql
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/mit-pdos/distributary-mysql
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/mit-pdos/distributary-mysql" "work/ex/beta-1.38-1/sources/1.37.0/gh/mit-pdos/distributary-mysql"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/mit-pdos/distributary-mysql'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/mit-pdos/distributary-mysql" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mit-pdos/distributary-mysql"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mit-pdos/distributary-mysql'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 4767a309feecb7195dcd3eef118efadd1f87a05b
[INFO] sha for GitHub repo mit-pdos/distributary-mysql: 4767a309feecb7195dcd3eef118efadd1f87a05b
[INFO] validating manifest of mit-pdos/distributary-mysql 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 mit-pdos/distributary-mysql 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 mit-pdos/distributary-mysql
[INFO] finished frobbing mit-pdos/distributary-mysql
[INFO] frobbed toml for mit-pdos/distributary-mysql written to work/ex/beta-1.38-1/sources/1.37.0/gh/mit-pdos/distributary-mysql/Cargo.toml
[INFO] started frobbing mit-pdos/distributary-mysql
[INFO] finished frobbing mit-pdos/distributary-mysql
[INFO] frobbed toml for mit-pdos/distributary-mysql written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mit-pdos/distributary-mysql/Cargo.toml
[INFO] crate mit-pdos/distributary-mysql 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing mit-pdos/distributary-mysql 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-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/mit-pdos/distributary-mysql:/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] 120b6d05adad5f2aee4ccacce598fc0c00b45c1f6bb9abf15918b351657bdcec
[INFO] running `"docker" "start" "-a" "120b6d05adad5f2aee4ccacce598fc0c00b45c1f6bb9abf15918b351657bdcec"`
[INFO] [stderr]    Compiling serde v1.0.92
[INFO] [stderr]    Compiling num-bigint v0.2.2
[INFO] [stderr]    Compiling bit-vec v0.5.1
[INFO] [stderr]    Compiling snowflake v1.3.0
[INFO] [stderr]    Compiling uuid v0.7.4
[INFO] [stderr]    Compiling num-traits v0.2.8
[INFO] [stderr]    Compiling backtrace v0.3.30
[INFO] [stderr]    Compiling tower-service v0.2.0
[INFO] [stderr]    Compiling crossbeam-channel v0.3.8
[INFO] [stderr]    Compiling stackvector v1.0.2
[INFO] [stderr]    Compiling tower-discover v0.1.0
[INFO] [stderr]    Compiling tower-layer v0.1.0
[INFO] [stderr]    Compiling nom v4.2.3
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]    Compiling block-buffer v0.7.3
[INFO] [stderr]    Compiling tokio-io v0.1.12
[INFO] [stderr]    Compiling mio-extras v2.0.5
[INFO] [stderr]    Compiling tokio-threadpool v0.1.14
[INFO] [stderr]    Compiling twox-hash v1.3.0
[INFO] [stderr]    Compiling tower-load-shed v0.1.0
[INFO] [stderr]    Compiling tower-limit v0.1.0
[INFO] [stderr]    Compiling tower-retry v0.1.0
[INFO] [stderr]    Compiling tower-buffer v0.1.0
[INFO] [stderr]    Compiling tower-timeout v0.1.0
[INFO] [stderr]    Compiling tower-load v0.1.0 (https://github.com/tower-rs/tower.git#03ec4aaf)
[INFO] [stderr]    Compiling rayon v1.1.0
[INFO] [stderr]    Compiling sha2 v0.8.0
[INFO] [stderr]    Compiling lexical-core v0.4.0
[INFO] [stderr]    Compiling crossbeam v0.7.1
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling tokio-codec v0.1.1
[INFO] [stderr]    Compiling tower-util v0.1.0
[INFO] [stderr]    Compiling h2 v0.1.24
[INFO] [stderr]    Compiling bufstream v0.1.4
[INFO] [stderr]    Compiling tokio-reactor v0.1.9
[INFO] [stderr]    Compiling tokio-tower v0.1.1 (https://github.com/tower-rs/tokio-tower.git#839b25c8)
[INFO] [stderr]    Compiling tower-balance v0.1.0 (https://github.com/tower-rs/tower.git#03ec4aaf)
[INFO] [stderr]    Compiling tower v0.1.0
[INFO] [stderr]    Compiling tokio-fs v0.1.6
[INFO] [stderr]    Compiling tokio-tcp v0.1.3
[INFO] [stderr]    Compiling tokio-uds v0.2.5
[INFO] [stderr]    Compiling tokio-udp v0.1.3
[INFO] [stderr]    Compiling tokio-signal v0.2.7
[INFO] [stderr]    Compiling cc v1.0.37
[INFO] [stderr]    Compiling tokio v0.1.21
[INFO] [stderr]    Compiling lexical v2.1.0
[INFO] [stderr]    Compiling zookeeper_derive v0.4.0
[INFO] [stderr]    Compiling hyper v0.12.30
[INFO] [stderr]    Compiling backtrace-sys v0.1.28
[INFO] [stderr]    Compiling zookeeper v0.5.6
[INFO] [stderr]    Compiling serde_json v1.0.39
[INFO] [stderr]    Compiling bincode v1.1.4
[INFO] [stderr]    Compiling chrono v0.4.6
[INFO] [stderr]    Compiling nom-sql v0.0.6
[INFO] [stderr]    Compiling vec_map v0.8.1
[INFO] [stderr]    Compiling arccstr v1.2.3
[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/arccstr-1.2.3/src/lib.rs:60:1
[INFO] [stderr]    |
[INFO] [stderr] 60 | #![feature(try_from)]
[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 `arccstr`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "120b6d05adad5f2aee4ccacce598fc0c00b45c1f6bb9abf15918b351657bdcec"`
[INFO] running `"docker" "rm" "-f" "120b6d05adad5f2aee4ccacce598fc0c00b45c1f6bb9abf15918b351657bdcec"`
[INFO] [stdout] 120b6d05adad5f2aee4ccacce598fc0c00b45c1f6bb9abf15918b351657bdcec