[INFO] fetching crate karabiner 0.1.0...
[INFO] testing karabiner-0.1.0 against 1.54.0 for beta-1.55-1
[INFO] extracting crate karabiner 0.1.0 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate karabiner 0.1.0 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate karabiner 0.1.0
[INFO] finished tweaking crates.io crate karabiner 0.1.0
[INFO] tweaked toml for crates.io crate karabiner 0.1.0 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded karabiner-thunk v0.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 852c2a280b39f00901c73fd9bc72ddcc6c3b3489f4a4eb8fb12b3976427876ac
[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" "852c2a280b39f00901c73fd9bc72ddcc6c3b3489f4a4eb8fb12b3976427876ac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "852c2a280b39f00901c73fd9bc72ddcc6c3b3489f4a4eb8fb12b3976427876ac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "852c2a280b39f00901c73fd9bc72ddcc6c3b3489f4a4eb8fb12b3976427876ac", kill_on_drop: false }`
[INFO] [stdout] 852c2a280b39f00901c73fd9bc72ddcc6c3b3489f4a4eb8fb12b3976427876ac
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "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] 822831d6b20ece0c04bfeeb68de2334ef0d0421098e79eacbab7b21ce36be924
[INFO] running `Command { std: "docker" "start" "-a" "822831d6b20ece0c04bfeeb68de2334ef0d0421098e79eacbab7b21ce36be924", kill_on_drop: false }`
[INFO] [stderr]    Compiling parking_lot v0.4.8
[INFO] [stderr]    Compiling karabiner-onetime v0.1.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/karabiner-onetime-0.1.0/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(integer_atomics)]
[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 `karabiner-onetime`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "822831d6b20ece0c04bfeeb68de2334ef0d0421098e79eacbab7b21ce36be924", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "822831d6b20ece0c04bfeeb68de2334ef0d0421098e79eacbab7b21ce36be924", kill_on_drop: false }`
[INFO] [stdout] 822831d6b20ece0c04bfeeb68de2334ef0d0421098e79eacbab7b21ce36be924
