[INFO] fetching crate ratchet 1.2.0...
[INFO] checking ratchet-1.2.0 against beta for pr-78714
[INFO] extracting crate ratchet 1.2.0 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate ratchet 1.2.0 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 ratchet 1.2.0
[INFO] finished tweaking crates.io crate ratchet 1.2.0
[INFO] tweaked toml for crates.io crate ratchet 1.2.0 written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[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-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] [stdout] 1fe22ac57d7eedb0fba8508e034314d0b0836bcf4345cc89d3ea09d9dfe1cc5d
[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" "1fe22ac57d7eedb0fba8508e034314d0b0836bcf4345cc89d3ea09d9dfe1cc5d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1fe22ac57d7eedb0fba8508e034314d0b0836bcf4345cc89d3ea09d9dfe1cc5d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1fe22ac57d7eedb0fba8508e034314d0b0836bcf4345cc89d3ea09d9dfe1cc5d", kill_on_drop: false }`
[INFO] [stdout] 1fe22ac57d7eedb0fba8508e034314d0b0836bcf4345cc89d3ea09d9dfe1cc5d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] 49e59119ce45bcd266204a639a48fe55fe0ea6566e6e795a66d90892c96a9b0e
[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" "49e59119ce45bcd266204a639a48fe55fe0ea6566e6e795a66d90892c96a9b0e", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling clear_on_drop v0.2.4
[INFO] [stderr]     Checking serde_cbor v0.11.1
[INFO] [stderr]     Checking sha-1 v0.8.2
[INFO] [stderr]     Checking ratchet v1.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:23:1
[INFO] [stdout]    |
[INFO] [stdout] 23 | #![feature(trusted_len, generator_trait, never_type,)]
[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 `ratchet`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "49e59119ce45bcd266204a639a48fe55fe0ea6566e6e795a66d90892c96a9b0e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "49e59119ce45bcd266204a639a48fe55fe0ea6566e6e795a66d90892c96a9b0e", kill_on_drop: false }`
[INFO] [stdout] 49e59119ce45bcd266204a639a48fe55fe0ea6566e6e795a66d90892c96a9b0e