[INFO] crate register 0.5.1 is already in cache
[INFO] testing register-0.5.1 against beta-2020-07-24 for beta-1.46-1
[INFO] extracting crate register 0.5.1 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate register 0.5.1 on toolchain beta-2020-07-24
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "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-10/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-2020-07-24" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 71ae30f48e2f0361ff3e221c600fa9b5f2f16f064be1d074854d7ad163873b9d
[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" "71ae30f48e2f0361ff3e221c600fa9b5f2f16f064be1d074854d7ad163873b9d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "71ae30f48e2f0361ff3e221c600fa9b5f2f16f064be1d074854d7ad163873b9d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "71ae30f48e2f0361ff3e221c600fa9b5f2f16f064be1d074854d7ad163873b9d", kill_on_drop: false }`
[INFO] [stdout] 71ae30f48e2f0361ff3e221c600fa9b5f2f16f064be1d074854d7ad163873b9d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "MAP_USER_ID=0" "-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@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8f0af0428a5950f771ab1a98c2b67769f571b90cf653b9909a60189fb9485f92
[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" "8f0af0428a5950f771ab1a98c2b67769f571b90cf653b9909a60189fb9485f92", kill_on_drop: false }`
[INFO] [stderr]    Compiling 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] [stderr] error: could not compile `tock-registers`.
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "8f0af0428a5950f771ab1a98c2b67769f571b90cf653b9909a60189fb9485f92", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8f0af0428a5950f771ab1a98c2b67769f571b90cf653b9909a60189fb9485f92", kill_on_drop: false }`
[INFO] [stdout] 8f0af0428a5950f771ab1a98c2b67769f571b90cf653b9909a60189fb9485f92