[INFO] fetching crate iref-enum 1.2.0...
[INFO] testing iref-enum-1.2.0 against 1.54.0 for beta-1.55-1
[INFO] extracting crate iref-enum 1.2.0 into /workspace/builds/worker-93/source
[INFO] validating manifest of crates.io crate iref-enum 1.2.0 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 iref-enum 1.2.0
[INFO] finished tweaking crates.io crate iref-enum 1.2.0
[INFO] tweaked toml for crates.io crate iref-enum 1.2.0 written to /workspace/builds/worker-93/source/Cargo.toml
[INFO] crate crates.io crate iref-enum 1.2.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "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-93/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-93/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] 9eefde4cb543b1d4825ed43b2481ce08d0d9feee3a7e49bb258e18c80dd35318
[INFO] running `Command { std: "docker" "start" "-a" "9eefde4cb543b1d4825ed43b2481ce08d0d9feee3a7e49bb258e18c80dd35318", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9eefde4cb543b1d4825ed43b2481ce08d0d9feee3a7e49bb258e18c80dd35318", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9eefde4cb543b1d4825ed43b2481ce08d0d9feee3a7e49bb258e18c80dd35318", kill_on_drop: false }`
[INFO] [stdout] 9eefde4cb543b1d4825ed43b2481ce08d0d9feee3a7e49bb258e18c80dd35318
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-93/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-93/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] 2ac59df48a22d7cc97d6e2211e6c078c0085b5f248ab4600aacf9083874fa4c4
[INFO] running `Command { std: "docker" "start" "-a" "2ac59df48a22d7cc97d6e2211e6c078c0085b5f248ab4600aacf9083874fa4c4", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling syn v1.0.44
[INFO] [stderr]    Compiling pct-str v1.1.0
[INFO] [stderr]    Compiling iref v1.4.0
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]    Compiling iref-enum v1.2.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 11.14s
[INFO] running `Command { std: "docker" "inspect" "2ac59df48a22d7cc97d6e2211e6c078c0085b5f248ab4600aacf9083874fa4c4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2ac59df48a22d7cc97d6e2211e6c078c0085b5f248ab4600aacf9083874fa4c4", kill_on_drop: false }`
[INFO] [stdout] 2ac59df48a22d7cc97d6e2211e6c078c0085b5f248ab4600aacf9083874fa4c4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-93/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-93/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" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2134e71e2b77516a22b27412f551ac9e599b50f5d2013108648bc57ace221f03
[INFO] running `Command { std: "docker" "start" "-a" "2134e71e2b77516a22b27412f551ac9e599b50f5d2013108648bc57ace221f03", kill_on_drop: false }`
[INFO] [stderr]    Compiling static-iref v1.0.0
[INFO] [stderr]    Compiling iref-enum v1.2.0 (/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`
[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" "2134e71e2b77516a22b27412f551ac9e599b50f5d2013108648bc57ace221f03", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2134e71e2b77516a22b27412f551ac9e599b50f5d2013108648bc57ace221f03", kill_on_drop: false }`
[INFO] [stdout] 2134e71e2b77516a22b27412f551ac9e599b50f5d2013108648bc57ace221f03
