[INFO] fetching crate petpet 2.1.1...
[INFO] testing petpet-2.1.1 against 1.59.0 for beta-1.60-1
[INFO] extracting crate petpet 2.1.1 into /workspace/builds/worker-92/source
[INFO] validating manifest of crates.io crate petpet 2.1.1 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 petpet 2.1.1
[INFO] finished tweaking crates.io crate petpet 2.1.1
[INFO] tweaked toml for crates.io crate petpet 2.1.1 written to /workspace/builds/worker-92/source/Cargo.toml
[INFO] crate crates.io crate petpet 2.1.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-92/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-92/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] 476cf678b6720f46792e68aa621617bfaf24ce947b26796f788e041408c74d7c
[INFO] running `Command { std: "docker" "start" "-a" "476cf678b6720f46792e68aa621617bfaf24ce947b26796f788e041408c74d7c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "476cf678b6720f46792e68aa621617bfaf24ce947b26796f788e041408c74d7c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "476cf678b6720f46792e68aa621617bfaf24ce947b26796f788e041408c74d7c", kill_on_drop: false }`
[INFO] [stdout] 476cf678b6720f46792e68aa621617bfaf24ce947b26796f788e041408c74d7c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-92/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-92/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] 04253af00b969dba82c544471f3e240dd66ca8b432e31ef0ba959e7a281de725
[INFO] running `Command { std: "docker" "start" "-a" "04253af00b969dba82c544471f3e240dd66ca8b432e31ef0ba959e7a281de725", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.98
[INFO] [stderr]    Compiling scopeguard v1.1.0
[INFO] [stderr]    Compiling crossbeam-utils v0.8.5
[INFO] [stderr]    Compiling proc-macro2 v1.0.28
[INFO] [stderr]    Compiling encoding_index_tests v0.1.4
[INFO] [stderr]    Compiling syn v1.0.74
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.5
[INFO] [stderr]    Compiling rayon-core v1.9.1
[INFO] [stderr]    Compiling crc32fast v1.2.1
[INFO] [stderr]    Compiling futures-core v0.3.16
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling futures-sink v0.3.16
[INFO] [stderr]    Compiling half v1.8.2
[INFO] [stderr]    Compiling lebe v0.5.1
[INFO] [stderr]    Compiling smallvec v1.8.0
[INFO] [stderr]    Compiling bit_field v0.10.1
[INFO] [stderr]    Compiling bytemuck v1.7.2
[INFO] [stderr]    Compiling memoffset v0.6.4
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]    Compiling num-rational v0.4.0
[INFO] [stderr]    Compiling inflate v0.4.5
[INFO] [stderr]    Compiling deflate v0.9.1
[INFO] [stderr]    Compiling deflate v1.0.0
[INFO] [stderr]    Compiling gif v0.11.2
[INFO] [stderr]    Compiling lock_api v0.4.4
[INFO] [stderr]    Compiling encoding-index-singlebyte v1.20141219.5
[INFO] [stderr]    Compiling encoding-index-simpchinese v1.20141219.5
[INFO] [stderr]    Compiling encoding-index-korean v1.20141219.5
[INFO] [stderr]    Compiling encoding-index-japanese v1.20141219.5
[INFO] [stderr]    Compiling encoding-index-tradchinese v1.20141219.5
[INFO] [stderr]    Compiling spin v0.9.2
[INFO] [stderr]    Compiling encoding v0.2.33
[INFO] [stderr]    Compiling crossbeam-channel v0.5.1
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling png v0.17.2
[INFO] [stderr]    Compiling crossbeam-deque v0.8.1
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling getrandom v0.2.3
[INFO] [stderr]    Compiling flate2 v1.0.22
[INFO] [stderr]    Compiling nanorand v0.6.1
[INFO] [stderr]    Compiling threadpool v1.8.1
[INFO] [stderr]    Compiling tiff v0.7.1
[INFO] [stderr]    Compiling jpeg-decoder v0.2.1
[INFO] [stderr]    Compiling pin-project-internal v1.0.8
[INFO] [stderr]    Compiling pin-project v1.0.8
[INFO] [stderr]    Compiling flume v0.10.10
[INFO] [stderr]    Compiling exr v1.4.1
[INFO] [stderr]    Compiling image v0.24.0
[INFO] [stderr]    Compiling petpet v2.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(once_cell)]
[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 `petpet` 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" "04253af00b969dba82c544471f3e240dd66ca8b432e31ef0ba959e7a281de725", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "04253af00b969dba82c544471f3e240dd66ca8b432e31ef0ba959e7a281de725", kill_on_drop: false }`
[INFO] [stdout] 04253af00b969dba82c544471f3e240dd66ca8b432e31ef0ba959e7a281de725