[INFO] fetching crate casperlabs-contract 0.6.1...
[INFO] testing casperlabs-contract-0.6.1 against beta-2021-01-01 for beta-1.50-1
[INFO] extracting crate casperlabs-contract 0.6.1 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate casperlabs-contract 0.6.1 on toolchain beta-2021-01-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate casperlabs-contract 0.6.1
[INFO] finished tweaking crates.io crate casperlabs-contract 0.6.1
[INFO] tweaked toml for crates.io crate casperlabs-contract 0.6.1 written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 23d9f72b6c4dd0568e881135ee3797c3982ab44f21aa5abb0ecd0c2960c5a395
[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" "23d9f72b6c4dd0568e881135ee3797c3982ab44f21aa5abb0ecd0c2960c5a395", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "23d9f72b6c4dd0568e881135ee3797c3982ab44f21aa5abb0ecd0c2960c5a395", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "23d9f72b6c4dd0568e881135ee3797c3982ab44f21aa5abb0ecd0c2960c5a395", kill_on_drop: false }`
[INFO] [stdout] 23d9f72b6c4dd0568e881135ee3797c3982ab44f21aa5abb0ecd0c2960c5a395
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "RUSTFLAGS=--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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 057b863f307c54bb45d9325e7091c8ed5f507cfb697aeec8deb3204072c9fcb2
[INFO] running `Command { std: "docker" "start" "-a" "057b863f307c54bb45d9325e7091c8ed5f507cfb697aeec8deb3204072c9fcb2", kill_on_drop: false }`
[INFO] [stderr]    Compiling base16 v0.2.1
[INFO] [stderr]    Compiling uint v0.8.5
[INFO] [stderr]    Compiling digest v0.8.1
[INFO] [stderr]    Compiling crypto-mac v0.7.0
[INFO] [stderr]    Compiling wee_alloc v0.4.5
[INFO] [stderr]    Compiling failure v0.1.8
[INFO] [stderr]    Compiling blake2 v0.8.1
[INFO] [stderr]    Compiling casperlabs-types v0.6.1
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/casperlabs-types-0.6.1/src/lib.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     feature(min_specialization, try_reserve)
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[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 `casperlabs-types`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "057b863f307c54bb45d9325e7091c8ed5f507cfb697aeec8deb3204072c9fcb2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "057b863f307c54bb45d9325e7091c8ed5f507cfb697aeec8deb3204072c9fcb2", kill_on_drop: false }`
[INFO] [stdout] 057b863f307c54bb45d9325e7091c8ed5f507cfb697aeec8deb3204072c9fcb2