[INFO] fetching crate lpc177x_8x-hal 0.4.0...
[INFO] testing lpc177x_8x-hal-0.4.0 against beta-2021-01-01 for beta-1.50-1
[INFO] extracting crate lpc177x_8x-hal 0.4.0 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate lpc177x_8x-hal 0.4.0 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] removed /workspace/builds/worker-3/source/.cargo/config
[INFO] started tweaking crates.io crate lpc177x_8x-hal 0.4.0
[INFO] finished tweaking crates.io crate lpc177x_8x-hal 0.4.0
[INFO] tweaked toml for crates.io crate lpc177x_8x-hal 0.4.0 written to /workspace/builds/worker-3/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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded lpc177x_8x v0.13.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 13ebd6770a95517c5c52e32c895e9b845c4e0467dcd2c2478ad56f265da50c0f
[INFO] running `Command { std: "docker" "start" "-a" "13ebd6770a95517c5c52e32c895e9b845c4e0467dcd2c2478ad56f265da50c0f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "13ebd6770a95517c5c52e32c895e9b845c4e0467dcd2c2478ad56f265da50c0f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "13ebd6770a95517c5c52e32c895e9b845c4e0467dcd2c2478ad56f265da50c0f", kill_on_drop: false }`
[INFO] [stdout] 13ebd6770a95517c5c52e32c895e9b845c4e0467dcd2c2478ad56f265da50c0f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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] [stdout] 482ea30c32185ff74a6e2643071c62b6249df2d4a6b29ceee87028bb137c3d67
[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" "482ea30c32185ff74a6e2643071c62b6249df2d4a6b29ceee87028bb137c3d67", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.57
[INFO] [stderr]    Compiling cortex-m v0.5.10
[INFO] [stderr]    Compiling cortex-m-rt v0.6.13
[INFO] [stderr]    Compiling aligned v0.2.0
[INFO] [stderr]    Compiling r0 v0.2.2
[INFO] [stderr]    Compiling lpc177x_8x v0.13.5
[INFO] [stderr]    Compiling nb v0.1.3
[INFO] [stderr]    Compiling embedded-hal v0.2.4
[INFO] [stderr]    Compiling cortex-m-rt-macros v0.1.8
[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/lpc177x_8x-0.13.5/src/lib.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![feature(untagged_unions)]
[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 `lpc177x_8x`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "482ea30c32185ff74a6e2643071c62b6249df2d4a6b29ceee87028bb137c3d67", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "482ea30c32185ff74a6e2643071c62b6249df2d4a6b29ceee87028bb137c3d67", kill_on_drop: false }`
[INFO] [stdout] 482ea30c32185ff74a6e2643071c62b6249df2d4a6b29ceee87028bb137c3d67