[INFO] crate smtpbis 0.1.1 is already in cache
[INFO] testing smtpbis-0.1.1 against beta-2019-09-28 for beta-1.39-1
[INFO] extracting crate smtpbis 0.1.1 into work/builds/worker-3/source
[INFO] validating manifest of crates.io crate smtpbis 0.1.1 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 crates.io crate smtpbis 0.1.1
[INFO] finished tweaking crates.io crate smtpbis 0.1.1
[INFO] tweaked toml for crates.io crate smtpbis 0.1.1 written to work/builds/worker-3/source/Cargo.toml
[INFO] crate crates.io crate smtpbis 0.1.1 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-3/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-3/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] 0cd9a9fcdd4efa37bc7c7335a4c04c2f243f6c35f80c0b400563c67a87836bca
[INFO] running `"docker" "start" "-a" "0cd9a9fcdd4efa37bc7c7335a4c04c2f243f6c35f80c0b400563c67a87836bca"`
[INFO] [stderr]    Compiling syn v1.0.5
[INFO] [stderr]    Compiling arc-swap v0.4.2
[INFO] [stderr]    Compiling static_assertions v0.3.4
[INFO] [stderr]    Compiling crossbeam-utils v0.6.6
[INFO] [stderr]    Compiling tracing-core v0.1.5
[INFO] [stderr]    Compiling ring v0.16.8
[INFO] [stderr]    Compiling nom v5.0.1
[INFO] [stderr]    Compiling stackvector v1.0.6
[INFO] [stderr]    Compiling lexical-core v0.4.3
[INFO] [stderr]    Compiling bytes v0.4.12
[INFO] [stderr]    Compiling tokio-sync v0.2.0-alpha.3
[INFO] [stderr]    Compiling mio v0.6.19
[INFO] [stderr]    Compiling signal-hook-registry v1.1.1
[INFO] [stderr]    Compiling crossbeam-epoch v0.7.2
[INFO] [stderr]    Compiling crossbeam-queue v0.1.2
[INFO] [stderr]    Compiling crossbeam-channel v0.3.9
[INFO] [stderr]    Compiling tokio-io v0.2.0-alpha.3
[INFO] [stderr]    Compiling crossbeam-deque v0.7.1
[INFO] [stderr]    Compiling mio-uds v0.6.7
[INFO] [stderr]    Compiling tokio-codec v0.2.0-alpha.3
[INFO] [stderr]    Compiling sct v0.6.0
[INFO] [stderr]    Compiling webpki v0.21.0
[INFO] [stderr]    Compiling rustls v0.16.0
[INFO] [stderr]    Compiling rustyknife v0.2.2
[INFO] [stderr]    Compiling tokio-rustls v0.12.0-alpha.1
[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/rustyknife-0.2.2/src/lib.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![feature(external_doc)]
[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 `rustyknife`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "0cd9a9fcdd4efa37bc7c7335a4c04c2f243f6c35f80c0b400563c67a87836bca"`
[INFO] running `"docker" "rm" "-f" "0cd9a9fcdd4efa37bc7c7335a4c04c2f243f6c35f80c0b400563c67a87836bca"`
[INFO] [stdout] 0cd9a9fcdd4efa37bc7c7335a4c04c2f243f6c35f80c0b400563c67a87836bca