[INFO] cloning repository https://github.com/Fantom-foundation/libconsensus-dag
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Fantom-foundation/libconsensus-dag" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FFantom-foundation%2Flibconsensus-dag", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FFantom-foundation%2Flibconsensus-dag'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1f9ec3570c70d51c060cfc5eba8d76f938890dcb
[INFO] documenting Fantom-foundation/libconsensus-dag against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FFantom-foundation%2Flibconsensus-dag" "/workspace/builds/worker-12/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Fantom-foundation/libconsensus-dag on toolchain beta-2020-08-29
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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 /workspace/builds/worker-12/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[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] [stderr]     Updating git repository `https://github.com/Fantom-foundation/libsignature-ed25519-dalek`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded os_pipe v0.9.2
[INFO] [stderr]   Downloaded ed25519 v1.0.1
[INFO] [stderr]   Downloaded cpuid-bool v0.1.2
[INFO] [stderr]   Downloaded sha2 v0.9.1
[INFO] [stderr]   Downloaded fs_extra v1.2.0
[INFO] [stderr]   Downloaded futures-io-preview v0.3.0-alpha.19
[INFO] [stderr]   Downloaded opaque-debug v0.3.0
[INFO] [stderr]   Downloaded syslog v4.0.1
[INFO] [stderr]   Downloaded futures-preview v0.3.0-alpha.19
[INFO] [stderr]   Downloaded os_pipe v0.8.2
[INFO] [stderr]   Downloaded signature v1.2.2
[INFO] [stderr]   Downloaded zeroize_derive v1.0.0
[INFO] [stderr]   Downloaded mac v0.0.2
[INFO] [stderr]   Downloaded block-buffer v0.9.0
[INFO] [stderr]   Downloaded ed25519-dalek v1.0.0
[INFO] [stderr]   Downloaded curve25519-dalek v3.0.0
[INFO] [stderr]   Downloaded buffer v0.1.8
[INFO] [stderr]   Downloaded futures-join-macro-preview v0.3.0-alpha.19
[INFO] [stderr]   Downloaded async-timer v0.6.3
[INFO] [stderr]   Downloaded to_vec v0.1.0
[INFO] [stderr]   Downloaded futures-executor-preview v0.3.0-alpha.19
[INFO] [stderr]   Downloaded futures-select-macro-preview v0.3.0-alpha.19
[INFO] [stderr]   Downloaded sled v0.29.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3fb26026c2ab87aa6b5d33a800524a28391ba88cf32fdc13968e163694d38235
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "3fb26026c2ab87aa6b5d33a800524a28391ba88cf32fdc13968e163694d38235", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3fb26026c2ab87aa6b5d33a800524a28391ba88cf32fdc13968e163694d38235", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3fb26026c2ab87aa6b5d33a800524a28391ba88cf32fdc13968e163694d38235", kill_on_drop: false }`
[INFO] [stdout] 3fb26026c2ab87aa6b5d33a800524a28391ba88cf32fdc13968e163694d38235
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0cd6f51ccc0bfc40d69c465407d25584bd20e8a3fa28915086be095a79591454
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "0cd6f51ccc0bfc40d69c465407d25584bd20e8a3fa28915086be095a79591454", kill_on_drop: false }`
[INFO] [stderr]     Checking to_vec v0.1.0
[INFO] [stderr]     Checking mac v0.0.2
[INFO] [stderr]    Compiling jemalloc-sys v0.3.2
[INFO] [stderr]     Checking arrayvec v0.4.12
[INFO] [stderr]     Checking backtrace v0.3.50
[INFO] [stderr]     Checking fs2 v0.4.3
[INFO] [stderr]     Checking async-timer v0.6.3
[INFO] [stderr]     Checking os_pipe v0.9.2
[INFO] [stderr]     Checking os_pipe v0.8.2
[INFO] [stderr]     Checking env_logger v0.7.1
[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]     Checking parking_lot_core v0.6.2
[INFO] [stderr]     Checking sha3 v0.8.2
[INFO] [stderr]     Checking bincode v1.3.1
[INFO] [stderr]     Checking serde_bytes v0.11.5
[INFO] [stderr]     Checking serde_json v1.0.57
[INFO] [stderr]     Checking buffer v0.1.8
[INFO] [stderr]     Checking parking_lot v0.9.0
[INFO] [stderr]     Checking crossbeam-epoch v0.7.2
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]     Checking error-chain v0.11.0
[INFO] [stderr]     Checking syslog v4.0.1
[INFO] [stderr]     Checking libcommon-rs v0.0.2 (https://github.com/Fantom-foundation/libcommon-rs#a5b2ac03)
[INFO] [stderr]     Checking libhash v0.1.1 (https://github.com/Fantom-foundation/libhash#f98ab42c)
[INFO] [stderr]     Checking sled v0.29.2
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/git/checkouts/libcommon-rs-5e8b24176ba4c817/a5b2ac0/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(try_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking libhash-sha3 v0.1.1 (https://github.com/Fantom-foundation/libhash-sha3#8fe424d5)
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `libcommon-rs`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "0cd6f51ccc0bfc40d69c465407d25584bd20e8a3fa28915086be095a79591454", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0cd6f51ccc0bfc40d69c465407d25584bd20e8a3fa28915086be095a79591454", kill_on_drop: false }`
[INFO] [stdout] 0cd6f51ccc0bfc40d69c465407d25584bd20e8a3fa28915086be095a79591454