[INFO] updating cached repository jkcclemens/msyt
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/jkcclemens/msyt
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/jkcclemens/msyt" "work/ex/beta-1.38-1/sources/1.37.0/gh/jkcclemens/msyt"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/jkcclemens/msyt'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/jkcclemens/msyt" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jkcclemens/msyt"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jkcclemens/msyt'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 5789bc3c2f0747adc096afb6a2c716f87dbd7b4d
[INFO] sha for GitHub repo jkcclemens/msyt: 5789bc3c2f0747adc096afb6a2c716f87dbd7b4d
[INFO] validating manifest of jkcclemens/msyt 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 jkcclemens/msyt 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 jkcclemens/msyt
[INFO] finished frobbing jkcclemens/msyt
[INFO] frobbed toml for jkcclemens/msyt written to work/ex/beta-1.38-1/sources/1.37.0/gh/jkcclemens/msyt/Cargo.toml
[INFO] started frobbing jkcclemens/msyt
[INFO] finished frobbing jkcclemens/msyt
[INFO] frobbed toml for jkcclemens/msyt written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jkcclemens/msyt/Cargo.toml
[INFO] crate jkcclemens/msyt 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 jkcclemens/msyt 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-5/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/jkcclemens/msyt:/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] 93ccfc23e1dcd893246f814d25d577b188ef9dee1353f4d3f04ae1dc19aff838
[INFO] running `"docker" "start" "-a" "93ccfc23e1dcd893246f814d25d577b188ef9dee1353f4d3f04ae1dc19aff838"`
[INFO] [stderr]    Compiling cc v1.0.31
[INFO] [stderr]    Compiling crossbeam-utils v0.2.2
[INFO] [stderr]    Compiling backtrace v0.3.14
[INFO] [stderr]    Compiling num_cpus v1.10.0
[INFO] [stderr]    Compiling byteordered v0.4.0
[INFO] [stderr]    Compiling serde_yaml v0.8.8
[INFO] [stderr]    Compiling indexmap v1.0.2
[INFO] [stderr]    Compiling synstructure v0.10.1
[INFO] [stderr]    Compiling serde_derive v1.0.89
[INFO] [stderr]    Compiling crossbeam-epoch v0.3.1
[INFO] [stderr]    Compiling crossbeam-deque v0.2.0
[INFO] [stderr]    Compiling backtrace-sys v0.1.28
[INFO] [stderr]    Compiling rayon-core v1.4.1
[INFO] [stderr]    Compiling failure_derive v0.1.5
[INFO] [stderr]    Compiling rayon v1.0.3
[INFO] [stderr]    Compiling failure v0.1.5
[INFO] [stderr]    Compiling msbt v0.1.0 (https://github.com/jkcclemens/msbt-rs#7bdb5031)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> /opt/crater/cargo-home/git/checkouts/msbt-rs-388c79d8058cbe92/7bdb503/src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(vec_remove_item)]
[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 `msbt`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "93ccfc23e1dcd893246f814d25d577b188ef9dee1353f4d3f04ae1dc19aff838"`
[INFO] running `"docker" "rm" "-f" "93ccfc23e1dcd893246f814d25d577b188ef9dee1353f4d3f04ae1dc19aff838"`
[INFO] [stdout] 93ccfc23e1dcd893246f814d25d577b188ef9dee1353f4d3f04ae1dc19aff838