[INFO] updating cached repository https://github.com/Fantom-foundation/libconsensus-dag
[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] [stderr] From https://github.com/Fantom-foundation/libconsensus-dag
[INFO] [stderr]    d75ae2b..50f25d5  master     -> master
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 50f25d507b237387c5fda5eacf0a81018cb8587a
[INFO] testing Fantom-foundation/libconsensus-dag against beta-2019-09-28 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2FFantom-foundation%2Flibconsensus-dag" "work/builds/worker-9/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Fantom-foundation/libconsensus-dag 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/Fantom-foundation/libconsensus-dag
[INFO] finished tweaking git repo https://github.com/Fantom-foundation/libconsensus-dag
[INFO] tweaked toml for git repo https://github.com/Fantom-foundation/libconsensus-dag written to work/builds/worker-9/source/Cargo.toml
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Updating git repository `https://github.com/Fantom-foundation/libcommon-rs`
[INFO] [stderr]     Updating git repository `https://github.com/Fantom-foundation/libconsensus`
[INFO] [stderr]     Updating git repository `https://github.com/Fantom-foundation/libhash`
[INFO] [stderr]     Updating git repository `https://github.com/Fantom-foundation/libhash-sha3`
[INFO] [stderr]     Updating git repository `https://github.com/Fantom-foundation/libsignature`
[INFO] [stderr]     Updating git repository `https://github.com/Fantom-foundation/libtransport`
[INFO] [stderr]     Updating git repository `https://github.com/Fantom-foundation/libtransport-tcp`
[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-9/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-9/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] 2351c26072dbc2e5b5f8ee1184925ae35be0b9c11c4a5f2641f77a0647de2b77
[INFO] running `"docker" "start" "-a" "2351c26072dbc2e5b5f8ee1184925ae35be0b9c11c4a5f2641f77a0647de2b77"`
[INFO] [stderr]    Compiling proc-macro-nested v0.1.3
[INFO] [stderr]    Compiling nodrop v0.1.13
[INFO] [stderr]    Compiling fs_extra v1.1.0
[INFO] [stderr]    Compiling to_vec v0.1.0
[INFO] [stderr]    Compiling odds v0.2.26
[INFO] [stderr]    Compiling mac v0.0.2
[INFO] [stderr]    Compiling fs2 v0.4.3
[INFO] [stderr]    Compiling async-timer v0.6.0
[INFO] [stderr]    Compiling backtrace-sys v0.1.31
[INFO] [stderr]    Compiling serde_derive v1.0.101
[INFO] [stderr]    Compiling proc-macro-hack v0.5.10
[INFO] [stderr]    Compiling os_pipe v0.8.2
[INFO] [stderr]    Compiling parking_lot_core v0.6.2
[INFO] [stderr]    Compiling sha3 v0.8.2
[INFO] [stderr]    Compiling backtrace v0.3.38
[INFO] [stderr]    Compiling arrayvec v0.4.11
[INFO] [stderr]    Compiling arrayvec v0.3.25
[INFO] [stderr]    Compiling parking_lot v0.9.0
[INFO] [stderr]    Compiling jemalloc-sys v0.3.2
[INFO] [stderr]    Compiling failure v0.1.5
[INFO] [stderr]    Compiling buffer v0.1.8
[INFO] [stderr]    Compiling crossbeam-epoch v0.7.2
[INFO] [stderr]    Compiling futures-select-macro-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling futures-join-macro-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling futures-util-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling serde v1.0.101
[INFO] [stderr]    Compiling futures-executor-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling futures-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling bincode v1.2.0
[INFO] [stderr]    Compiling libcommon-rs v0.0.1 (https://github.com/Fantom-foundation/libcommon-rs#ec2acc2c)
[INFO] [stderr]    Compiling libhash v0.1.0 (https://github.com/Fantom-foundation/libhash#60474f1a)
[INFO] [stderr]    Compiling serde_bytes v0.11.2
[INFO] [stderr]    Compiling serde_json v1.0.41
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> /opt/rustwide/cargo-home/git/checkouts/libcommon-rs-5e8b24176ba4c817/ec2acc2/src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(try_trait)]
[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 `libcommon-rs`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "2351c26072dbc2e5b5f8ee1184925ae35be0b9c11c4a5f2641f77a0647de2b77"`
[INFO] running `"docker" "rm" "-f" "2351c26072dbc2e5b5f8ee1184925ae35be0b9c11c4a5f2641f77a0647de2b77"`
[INFO] [stdout] 2351c26072dbc2e5b5f8ee1184925ae35be0b9c11c4a5f2641f77a0647de2b77