[INFO] fetching crate register 0.5.1...
[INFO] checking register-0.5.1 against beta for pr-78714
[INFO] extracting crate register 0.5.1 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate register 0.5.1 on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate register 0.5.1
[INFO] finished tweaking crates.io crate register 0.5.1
[INFO] tweaked toml for crates.io crate register 0.5.1 written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate crates.io crate register 0.5.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", 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] c113db7c7f4ff9f90ea3d218f410d2f6641fba1abee7908b2e41c83425d264fa
[INFO] running `Command { std: "docker" "start" "-a" "c113db7c7f4ff9f90ea3d218f410d2f6641fba1abee7908b2e41c83425d264fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c113db7c7f4ff9f90ea3d218f410d2f6641fba1abee7908b2e41c83425d264fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c113db7c7f4ff9f90ea3d218f410d2f6641fba1abee7908b2e41c83425d264fa", kill_on_drop: false }`
[INFO] [stdout] c113db7c7f4ff9f90ea3d218f410d2f6641fba1abee7908b2e41c83425d264fa
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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=forbid" "-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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7864527db3e9b52da665b08421bcf71775cea950d00619dad30aa167138fc483
[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" "7864527db3e9b52da665b08421bcf71775cea950d00619dad30aa167138fc483", kill_on_drop: false }`
[INFO] [stderr]     Checking tock-registers v0.5.0
[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/tock-registers-0.5.0/src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![feature(const_fn)]
[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 `tock-registers`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "7864527db3e9b52da665b08421bcf71775cea950d00619dad30aa167138fc483", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7864527db3e9b52da665b08421bcf71775cea950d00619dad30aa167138fc483", kill_on_drop: false }`
[INFO] [stdout] 7864527db3e9b52da665b08421bcf71775cea950d00619dad30aa167138fc483