[INFO] updating cached repository jail-maker/check_ip
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/jail-maker/check_ip
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/jail-maker/check_ip" "work/ex/beta-1.38-1/sources/1.37.0/gh/jail-maker/check_ip"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/jail-maker/check_ip'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/jail-maker/check_ip" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jail-maker/check_ip"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jail-maker/check_ip'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 93449c8958bd8e4bf5330d9b9a8c8e2ee24d17f1
[INFO] sha for GitHub repo jail-maker/check_ip: 93449c8958bd8e4bf5330d9b9a8c8e2ee24d17f1
[INFO] validating manifest of jail-maker/check_ip 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 jail-maker/check_ip 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 jail-maker/check_ip
[INFO] finished frobbing jail-maker/check_ip
[INFO] frobbed toml for jail-maker/check_ip written to work/ex/beta-1.38-1/sources/1.37.0/gh/jail-maker/check_ip/Cargo.toml
[INFO] started frobbing jail-maker/check_ip
[INFO] finished frobbing jail-maker/check_ip
[INFO] frobbed toml for jail-maker/check_ip written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jail-maker/check_ip/Cargo.toml
[INFO] crate jail-maker/check_ip 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 jail-maker/check_ip 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-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/jail-maker/check_ip:/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] 1a27b8469b8ce2f6e6af70cd7f64db2ebe42feddae2034e9bf59e926d6323a27
[INFO] running `"docker" "start" "-a" "1a27b8469b8ce2f6e6af70cd7f64db2ebe42feddae2034e9bf59e926d6323a27"`
[INFO] [stderr]    Compiling ipnetwork v0.12.6
[INFO] [stderr]    Compiling term_size v0.3.0
[INFO] [stderr]    Compiling atty v0.2.2
[INFO] [stderr]    Compiling serde_json v1.0.2
[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/ipnetwork-0.12.6/src/lib.rs:6:40
[INFO] [stderr]   |
[INFO] [stderr] 6 | #![cfg_attr(feature = "ipv6-iterator", feature(i128_type))]
[INFO] [stderr]   |                                        ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[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/ipnetwork-0.12.6/src/lib.rs:7:39
[INFO] [stderr]   |
[INFO] [stderr] 7 | #![cfg_attr(feature = "ipv6-methods", feature(i128_type))]
[INFO] [stderr]   |                                       ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]    Compiling textwrap v0.6.0
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `ipnetwork`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "1a27b8469b8ce2f6e6af70cd7f64db2ebe42feddae2034e9bf59e926d6323a27"`
[INFO] running `"docker" "rm" "-f" "1a27b8469b8ce2f6e6af70cd7f64db2ebe42feddae2034e9bf59e926d6323a27"`
[INFO] [stdout] 1a27b8469b8ce2f6e6af70cd7f64db2ebe42feddae2034e9bf59e926d6323a27