[INFO] updating cached repository https://github.com/redox-os/installer
[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] 3b0f59cbb00e70ef92c43a4541a7dbc754f5f983
[INFO] testing redox-os/installer against beta-2019-09-28 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fredox-os%2Finstaller" "work/builds/worker-4/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/redox-os/installer on toolchain beta-2019-09-28
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/redox-os/installer
[INFO] finished tweaking git repo https://github.com/redox-os/installer
[INFO] tweaked toml for git repo https://github.com/redox-os/installer written to work/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/redox-os/installer already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-4/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" "+beta-2019-09-28" "build" "--frozen"`
[INFO] [stdout] b6750d0d2352c8828582072ad4a2d7fc0147f55778c2bbacb0c6e2a92ba28fb0
[INFO] running `"docker" "start" "-a" "b6750d0d2352c8828582072ad4a2d7fc0147f55778c2bbacb0c6e2a92ba28fb0"`
[INFO] [stderr]    Compiling redox_pkgutils v0.1.3
[INFO] [stderr]    Compiling bytecount v0.1.7
[INFO] [stderr]    Compiling redox_syscall v0.1.56
[INFO] [stderr]    Compiling version-compare v0.0.4
[INFO] [stderr]    Compiling bidir-map v0.6.0
[INFO] [stderr]    Compiling arg_parser v0.1.0
[INFO] [stderr]    Compiling ring v0.13.5
[INFO] [stderr]    Compiling fuse v0.3.1
[INFO] [stderr]    Compiling blake2b_simd v0.5.8
[INFO] [stderr]    Compiling pbr v1.0.1
[INFO] [stderr]    Compiling tar v0.4.26
[INFO] [stderr]    Compiling uuid v0.5.1
[INFO] [stderr]    Compiling sha3 v0.8.2
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/redox_syscall-0.1.56/src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(asm)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/redox_syscall-0.1.56/src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(const_fn)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[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 `redox_syscall`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "b6750d0d2352c8828582072ad4a2d7fc0147f55778c2bbacb0c6e2a92ba28fb0"`
[INFO] running `"docker" "rm" "-f" "b6750d0d2352c8828582072ad4a2d7fc0147f55778c2bbacb0c6e2a92ba28fb0"`
[INFO] [stdout] b6750d0d2352c8828582072ad4a2d7fc0147f55778c2bbacb0c6e2a92ba28fb0