[INFO] crate polona-dl 0.1.0 is already in cache
[INFO] testing polona-dl-0.1.0 against 1.38.0 for beta-1.39-1
[INFO] extracting crate polona-dl 0.1.0 into work/builds/worker-6/source
[INFO] validating manifest of crates.io crate polona-dl 0.1.0 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 crates.io crate polona-dl 0.1.0
[INFO] finished tweaking crates.io crate polona-dl 0.1.0
[INFO] tweaked toml for crates.io crate polona-dl 0.1.0 written to work/builds/worker-6/source/Cargo.toml
[INFO] crate crates.io crate polona-dl 0.1.0 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-6/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-6/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] ae1eab0841c4a98640696d3b1a702b9e2c3c7ca6f15e8aea5da708b7bb67929d
[INFO] running `"docker" "start" "-a" "ae1eab0841c4a98640696d3b1a702b9e2c3c7ca6f15e8aea5da708b7bb67929d"`
[INFO] [stderr]    Compiling futures-core-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling spin v0.5.1
[INFO] [stderr]    Compiling futures-io-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling tokio-executor v0.2.0-alpha.1
[INFO] [stderr]    Compiling curl v0.4.22
[INFO] [stderr]    Compiling isahc v0.7.0
[INFO] [stderr]    Compiling strsim v0.9.2
[INFO] [stderr]    Compiling libnghttp2-sys v0.1.2
[INFO] [stderr]    Compiling openssl-sys v0.9.49
[INFO] [stderr]    Compiling libz-sys v1.0.25
[INFO] [stderr]    Compiling curl-sys v0.4.20
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]    Compiling socket2 v0.3.11
[INFO] [stderr]    Compiling bytes v0.4.12
[INFO] [stderr]    Compiling parking_lot_core v0.6.2
[INFO] [stderr]    Compiling backoff v0.1.5
[INFO] [stderr]    Compiling lazy_static v1.3.0
[INFO] [stderr]    Compiling futures-sink-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling mio v0.6.19
[INFO] [stderr]    Compiling chrono v0.4.7
[INFO] [stderr]    Compiling crossbeam-utils v0.6.6
[INFO] [stderr]    Compiling thread_local v0.3.6
[INFO] [stderr]    Compiling clicolors-control v1.0.0
[INFO] [stderr]    Compiling tracing-core v0.1.5
[INFO] [stderr]    Compiling parking_lot v0.9.0
[INFO] [stderr]    Compiling futures-channel-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling tokio-io v0.2.0-alpha.1
[INFO] [stderr]    Compiling http v0.1.18
[INFO] [stderr]    Compiling regex v1.2.1
[INFO] [stderr]    Compiling futures-util-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling sluice v0.4.1
[INFO] [stderr]    Compiling crossbeam-epoch v0.7.2
[INFO] [stderr]    Compiling crossbeam-queue v0.1.2
[INFO] [stderr]    Compiling tokio-executor v0.1.8
[INFO] [stderr]    Compiling crossbeam-channel v0.3.9
[INFO] [stderr]    Compiling tokio-codec v0.2.0-alpha.1
[INFO] [stderr]    Compiling tokio-timer v0.2.11
[INFO] [stderr]    Compiling mio-uds v0.6.7
[INFO] [stderr]    Compiling crossbeam-deque v0.7.1
[INFO] [stderr]    Compiling backoff-futures v0.1.1
[INFO] [stderr]    Compiling tokio-current-thread v0.2.0-alpha.1
[INFO] [stderr]    Compiling console v0.7.7
[INFO] [stderr]    Compiling docopt v1.1.0
[INFO] [stderr]    Compiling indicatif v0.11.0
[INFO] [stderr]    Compiling better-panic v0.1.2
[INFO] [stderr]    Compiling tokio-sync v0.2.0-alpha.1
[INFO] [stderr]    Compiling futures-executor-preview v0.3.0-alpha.17
[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/tokio-sync-0.2.0-alpha.1/src/lib.rs:10:1
[INFO] [stderr]    |
[INFO] [stderr] 10 | #![feature(async_await)]
[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 `tokio-sync`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "ae1eab0841c4a98640696d3b1a702b9e2c3c7ca6f15e8aea5da708b7bb67929d"`
[INFO] running `"docker" "rm" "-f" "ae1eab0841c4a98640696d3b1a702b9e2c3c7ca6f15e8aea5da708b7bb67929d"`
[INFO] [stdout] ae1eab0841c4a98640696d3b1a702b9e2c3c7ca6f15e8aea5da708b7bb67929d