[INFO] fetching crate rust_icu_unum 1.0.0...
[INFO] testing rust_icu_unum-1.0.0 against 1.54.0 for beta-1.55-1
[INFO] extracting crate rust_icu_unum 1.0.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate rust_icu_unum 1.0.0 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 rust_icu_unum 1.0.0
[INFO] finished tweaking crates.io crate rust_icu_unum 1.0.0
[INFO] tweaked toml for crates.io crate rust_icu_unum 1.0.0 written to /workspace/builds/worker-4/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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] 0ca6ba0af40b7873e50dc4fc12bb309b413ad6fa0049f6c6dadeb653ba7350e5
[INFO] running `Command { std: "docker" "start" "-a" "0ca6ba0af40b7873e50dc4fc12bb309b413ad6fa0049f6c6dadeb653ba7350e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0ca6ba0af40b7873e50dc4fc12bb309b413ad6fa0049f6c6dadeb653ba7350e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0ca6ba0af40b7873e50dc4fc12bb309b413ad6fa0049f6c6dadeb653ba7350e5", kill_on_drop: false }`
[INFO] [stdout] 0ca6ba0af40b7873e50dc4fc12bb309b413ad6fa0049f6c6dadeb653ba7350e5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] [stdout] e35f5201a88efd1f0bcc4b032ce84d958eb9f0a4970b68341e9f345a2b870b24
[INFO] running `Command { std: "docker" "start" "-a" "e35f5201a88efd1f0bcc4b032ce84d958eb9f0a4970b68341e9f345a2b870b24", kill_on_drop: false }`
[INFO] [stderr]    Compiling bindgen v0.53.3
[INFO] [stderr]    Compiling nom v5.1.2
[INFO] [stderr]    Compiling clang-sys v0.29.3
[INFO] [stderr]    Compiling rust_icu_uloc v1.0.0
[INFO] [stderr]    Compiling env_logger v0.7.1
[INFO] [stderr]    Compiling cexpr v0.4.0
[INFO] [stderr]    Compiling rust_icu_sys v1.0.0
[INFO] [stderr]    Compiling rust_icu_common v1.0.0
[INFO] [stderr]    Compiling rust_icu_ustring v1.0.0
[INFO] [stderr]    Compiling rust_icu_uenum v1.0.0
[INFO] [stderr]    Compiling rust_icu_uformattable v1.0.0
[INFO] [stderr]    Compiling rust_icu_unum v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:14:1
[INFO] [stdout]    |
[INFO] [stdout] 14 | #![feature(proc_macro_hygiene)]
[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 `rust_icu_unum`
[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" "e35f5201a88efd1f0bcc4b032ce84d958eb9f0a4970b68341e9f345a2b870b24", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e35f5201a88efd1f0bcc4b032ce84d958eb9f0a4970b68341e9f345a2b870b24", kill_on_drop: false }`
[INFO] [stdout] e35f5201a88efd1f0bcc4b032ce84d958eb9f0a4970b68341e9f345a2b870b24
