[INFO] fetching crate iref-enum 2.0.0...
[INFO] testing iref-enum-2.0.0 against 1.60.0 for beta-1.61-1
[INFO] extracting crate iref-enum 2.0.0 into /workspace/builds/worker-14/source
[INFO] validating manifest of crates.io crate iref-enum 2.0.0 on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate iref-enum 2.0.0
[INFO] finished tweaking crates.io crate iref-enum 2.0.0
[INFO] tweaked toml for crates.io crate iref-enum 2.0.0 written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] crate crates.io crate iref-enum 2.0.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded pct-str v1.1.0
[INFO] [stderr]   Downloaded iref v2.1.1
[INFO] [stderr]   Downloaded static-iref v2.0.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 16d461fc546578db09999a6cf416c7ba7464fccb1756a75d951200e60971c63e
[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" "16d461fc546578db09999a6cf416c7ba7464fccb1756a75d951200e60971c63e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "16d461fc546578db09999a6cf416c7ba7464fccb1756a75d951200e60971c63e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "16d461fc546578db09999a6cf416c7ba7464fccb1756a75d951200e60971c63e", kill_on_drop: false }`
[INFO] [stdout] 16d461fc546578db09999a6cf416c7ba7464fccb1756a75d951200e60971c63e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "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] c455c69bd28173894157d0e0e6ed3e8e05b224a3186893ee2a6b47ba868af97a
[INFO] running `Command { std: "docker" "start" "-a" "c455c69bd28173894157d0e0e6ed3e8e05b224a3186893ee2a6b47ba868af97a", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.89
[INFO] [stderr]    Compiling pct-str v1.1.0
[INFO] [stderr]    Compiling quote v1.0.16
[INFO] [stderr]    Compiling iref v2.1.1
[INFO] [stderr]    Compiling iref-enum v2.0.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 12.28s
[INFO] running `Command { std: "docker" "inspect" "c455c69bd28173894157d0e0e6ed3e8e05b224a3186893ee2a6b47ba868af97a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c455c69bd28173894157d0e0e6ed3e8e05b224a3186893ee2a6b47ba868af97a", kill_on_drop: false }`
[INFO] [stdout] c455c69bd28173894157d0e0e6ed3e8e05b224a3186893ee2a6b47ba868af97a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen" "--no-run" "--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] fd4fc5677878248e6841eb70cec44963b2a8e38ae12cbb5a98a06a175060ce2a
[INFO] running `Command { std: "docker" "start" "-a" "fd4fc5677878248e6841eb70cec44963b2a8e38ae12cbb5a98a06a175060ce2a", kill_on_drop: false }`
[INFO] [stderr]    Compiling static-iref v2.0.0
[INFO] [stderr]    Compiling iref-enum v2.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> examples/simple.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![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 `iref-enum` 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" "fd4fc5677878248e6841eb70cec44963b2a8e38ae12cbb5a98a06a175060ce2a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fd4fc5677878248e6841eb70cec44963b2a8e38ae12cbb5a98a06a175060ce2a", kill_on_drop: false }`
[INFO] [stdout] fd4fc5677878248e6841eb70cec44963b2a8e38ae12cbb5a98a06a175060ce2a