[INFO] fetching crate rust_icu_unumberformatter 1.0.0...
[INFO] testing rust_icu_unumberformatter-1.0.0 against 1.55.0 for beta-1.56-1
[INFO] extracting crate rust_icu_unumberformatter 1.0.0 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate rust_icu_unumberformatter 1.0.0 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate rust_icu_unumberformatter 1.0.0
[INFO] finished tweaking crates.io crate rust_icu_unumberformatter 1.0.0
[INFO] tweaked toml for crates.io crate rust_icu_unumberformatter 1.0.0 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "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" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a61a4152ec600daca839376178bc252f9fa78254ea2849b6db05355887eb0c7a
[INFO] running `Command { std: "docker" "start" "-a" "a61a4152ec600daca839376178bc252f9fa78254ea2849b6db05355887eb0c7a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a61a4152ec600daca839376178bc252f9fa78254ea2849b6db05355887eb0c7a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a61a4152ec600daca839376178bc252f9fa78254ea2849b6db05355887eb0c7a", kill_on_drop: false }`
[INFO] [stdout] a61a4152ec600daca839376178bc252f9fa78254ea2849b6db05355887eb0c7a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d7709bdb3f1b6df56c738342600aeadc49bbc52f517da4834ce8e784a9f65152
[INFO] running `Command { std: "docker" "start" "-a" "d7709bdb3f1b6df56c738342600aeadc49bbc52f517da4834ce8e784a9f65152", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling glob v0.3.0
[INFO] [stderr]    Compiling bindgen v0.53.3
[INFO] [stderr]    Compiling peeking_take_while v0.1.2
[INFO] [stderr]    Compiling lazycell v1.3.0
[INFO] [stderr]    Compiling shlex v0.1.1
[INFO] [stderr]    Compiling paste v1.0.5
[INFO] [stderr]    Compiling libloading v0.5.2
[INFO] [stderr]    Compiling nom v5.1.2
[INFO] [stderr]    Compiling which v3.1.1
[INFO] [stderr]    Compiling clap v2.33.3
[INFO] [stderr]    Compiling rust_icu_uloc v1.0.0
[INFO] [stderr]    Compiling thiserror-impl v1.0.29
[INFO] [stderr]    Compiling clang-sys v0.29.3
[INFO] [stderr]    Compiling aho-corasick v0.7.18
[INFO] [stderr]    Compiling regex v1.5.4
[INFO] [stderr]    Compiling env_logger v0.7.1
[INFO] [stderr]    Compiling thiserror v1.0.29
[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
[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/rust_icu_unum-1.0.0/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` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "d7709bdb3f1b6df56c738342600aeadc49bbc52f517da4834ce8e784a9f65152", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d7709bdb3f1b6df56c738342600aeadc49bbc52f517da4834ce8e784a9f65152", kill_on_drop: false }`
[INFO] [stdout] d7709bdb3f1b6df56c738342600aeadc49bbc52f517da4834ce8e784a9f65152