[INFO] updating cached repository https://github.com/jail-maker/check_ip
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 93449c8958bd8e4bf5330d9b9a8c8e2ee24d17f1
[INFO] testing jail-maker/check_ip against 1.38.0 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjail-maker%2Fcheck_ip" "work/builds/worker-1/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jail-maker/check_ip on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/jail-maker/check_ip
[INFO] finished tweaking git repo https://github.com/jail-maker/check_ip
[INFO] tweaked toml for git repo https://github.com/jail-maker/check_ip written to work/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/jail-maker/check_ip already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-1/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] 7841a083af4af863ed7892d543197131336953c2d0379fc73d510da72af28f29
[INFO] running `"docker" "start" "-a" "7841a083af4af863ed7892d543197131336953c2d0379fc73d510da72af28f29"`
[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/rustwide/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/rustwide/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" "7841a083af4af863ed7892d543197131336953c2d0379fc73d510da72af28f29"`
[INFO] running `"docker" "rm" "-f" "7841a083af4af863ed7892d543197131336953c2d0379fc73d510da72af28f29"`
[INFO] [stdout] 7841a083af4af863ed7892d543197131336953c2d0379fc73d510da72af28f29