[INFO] fetching crate enum-flags 0.3.0-preview2...
[INFO] testing enum-flags-0.3.0-preview2 against 1.59.0 for beta-1.60-1
[INFO] extracting crate enum-flags 0.3.0-preview2 into /workspace/builds/worker-33/source
[INFO] validating manifest of crates.io crate enum-flags 0.3.0-preview2 on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate enum-flags 0.3.0-preview2
[INFO] finished tweaking crates.io crate enum-flags 0.3.0-preview2
[INFO] tweaked toml for crates.io crate enum-flags 0.3.0-preview2 written to /workspace/builds/worker-33/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-33/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-33/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] aff4264439c00697bd63b72a37507fdb5f499a7fbf518e66db9cb0722668f12e
[INFO] running `Command { std: "docker" "start" "-a" "aff4264439c00697bd63b72a37507fdb5f499a7fbf518e66db9cb0722668f12e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "aff4264439c00697bd63b72a37507fdb5f499a7fbf518e66db9cb0722668f12e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aff4264439c00697bd63b72a37507fdb5f499a7fbf518e66db9cb0722668f12e", kill_on_drop: false }`
[INFO] [stdout] aff4264439c00697bd63b72a37507fdb5f499a7fbf518e66db9cb0722668f12e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-33/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-33/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1e864de943d58f84ab7a601f458c9484e1c39c60ef4cebcfd503f50fd29438f3
[INFO] running `Command { std: "docker" "start" "-a" "1e864de943d58f84ab7a601f458c9484e1c39c60ef4cebcfd503f50fd29438f3", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.36
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.86
[INFO] [stderr]    Compiling quote v1.0.15
[INFO] [stderr]    Compiling enum-flags v0.3.0-preview2 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.73s
[INFO] running `Command { std: "docker" "inspect" "1e864de943d58f84ab7a601f458c9484e1c39c60ef4cebcfd503f50fd29438f3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1e864de943d58f84ab7a601f458c9484e1c39c60ef4cebcfd503f50fd29438f3", kill_on_drop: false }`
[INFO] [stdout] 1e864de943d58f84ab7a601f458c9484e1c39c60ef4cebcfd503f50fd29438f3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-33/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-33/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3ec763b595d37dec7afa3a3b04747e922ed1c0afb80157f8bf131c63239d855f
[INFO] running `Command { std: "docker" "start" "-a" "3ec763b595d37dec7afa3a3b04747e922ed1c0afb80157f8bf131c63239d855f", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling enum-flags v0.3.0-preview2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> tests/test_flags.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(arbitrary_enum_discriminant)]
[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 `enum-flags` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "3ec763b595d37dec7afa3a3b04747e922ed1c0afb80157f8bf131c63239d855f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3ec763b595d37dec7afa3a3b04747e922ed1c0afb80157f8bf131c63239d855f", kill_on_drop: false }`
[INFO] [stdout] 3ec763b595d37dec7afa3a3b04747e922ed1c0afb80157f8bf131c63239d855f