[INFO] updating cached repository https://github.com/46bit/seequence
[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] f9177702944337f1156b84fe63a129a4374648dc
[INFO] testing 46bit/seequence against beta-2019-09-28 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2F46bit%2Fseequence" "work/builds/worker-11/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-11/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/46bit/seequence 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/46bit/seequence
[INFO] finished tweaking git repo https://github.com/46bit/seequence
[INFO] tweaked toml for git repo https://github.com/46bit/seequence written to work/builds/worker-11/source/Cargo.toml
[INFO] crate git repo https://github.com/46bit/seequence 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-11/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-11/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] 39c9c2c63cf843565a7946372f28a9dc2bdcf51e338b61d9199622903b9d60b4
[INFO] running `"docker" "start" "-a" "39c9c2c63cf843565a7946372f28a9dc2bdcf51e338b61d9199622903b9d60b4"`
[INFO] [stderr]    Compiling tokio-service v0.1.0
[INFO] [stderr]    Compiling serde_json v0.9.6
[INFO] [stderr]    Compiling uuid v0.3.1
[INFO] [stderr]    Compiling mio v0.6.4
[INFO] [stderr]    Compiling serde_codegen_internals v0.13.0
[INFO] [stderr]    Compiling tokio-core v0.1.4
[INFO] [stderr]    Compiling serde_derive v0.9.7
[INFO] [stderr]    Compiling tokio-proto v0.1.0
[INFO] [stderr]    Compiling seequence v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(custom_attribute)]
[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 `seequence`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "39c9c2c63cf843565a7946372f28a9dc2bdcf51e338b61d9199622903b9d60b4"`
[INFO] running `"docker" "rm" "-f" "39c9c2c63cf843565a7946372f28a9dc2bdcf51e338b61d9199622903b9d60b4"`
[INFO] [stdout] 39c9c2c63cf843565a7946372f28a9dc2bdcf51e338b61d9199622903b9d60b4