[INFO] fetching crate petpet-gui 1.0.0...
[INFO] documenting petpet-gui-1.0.0 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate petpet-gui 1.0.0 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate petpet-gui 1.0.0 on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate petpet-gui 1.0.0
[INFO] finished tweaking crates.io crate petpet-gui 1.0.0
[INFO] tweaked toml for crates.io crate petpet-gui 1.0.0 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate crates.io crate petpet-gui 1.0.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded petpet v2.1.1
[INFO] [stderr]   Downloaded image v0.24.0
[INFO] [stderr]   Downloaded nfd2 v0.3.0
[INFO] [stderr]   Downloaded flume v0.10.10
[INFO] [stderr]   Downloaded jpeg-decoder v0.2.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 41cf56775b8cbd656bf0f0319a43b339fdce08206ef09ca9fe8afd52482404b8
[INFO] running `Command { std: "docker" "start" "-a" "41cf56775b8cbd656bf0f0319a43b339fdce08206ef09ca9fe8afd52482404b8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "41cf56775b8cbd656bf0f0319a43b339fdce08206ef09ca9fe8afd52482404b8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "41cf56775b8cbd656bf0f0319a43b339fdce08206ef09ca9fe8afd52482404b8", kill_on_drop: false }`
[INFO] [stdout] 41cf56775b8cbd656bf0f0319a43b339fdce08206ef09ca9fe8afd52482404b8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "RUSTDOCFLAGS=--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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4d3810dff78dafcfac08bcea59f6c2316273f4ed8a08fdeebc1f117933e9abd5
[INFO] running `Command { std: "docker" "start" "-a" "4d3810dff78dafcfac08bcea59f6c2316273f4ed8a08fdeebc1f117933e9abd5", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling libc v0.2.112
[INFO] [stderr]    Compiling crossbeam-utils v0.8.6
[INFO] [stderr]    Compiling proc-macro2 v1.0.36
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]     Checking encoding_index_tests v0.1.4
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]    Compiling syn v1.0.85
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.6
[INFO] [stderr]     Checking adler32 v1.2.0
[INFO] [stderr]    Compiling crc32fast v1.3.0
[INFO] [stderr]    Compiling rayon-core v1.9.1
[INFO] [stderr]     Checking adler v1.0.2
[INFO] [stderr]    Compiling futures-core v0.3.19
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]     Checking futures-sink v0.3.19
[INFO] [stderr]     Checking weezl v0.1.5
[INFO] [stderr]     Checking jpeg-decoder v0.1.22
[INFO] [stderr]     Checking bitflags v1.3.2
[INFO] [stderr]     Checking color_quant v1.1.0
[INFO] [stderr]     Checking bit_field v0.10.1
[INFO] [stderr]     Checking lebe v0.5.1
[INFO] [stderr]     Checking smallvec v1.7.0
[INFO] [stderr]    Compiling cc v1.0.72
[INFO] [stderr]     Checking half v1.8.2
[INFO] [stderr]     Checking bytemuck v1.7.3
[INFO] [stderr]     Checking scoped_threadpool v0.1.9
[INFO] [stderr]     Checking lock_api v0.4.5
[INFO] [stderr]     Checking encoding-index-tradchinese v1.20141219.5
[INFO] [stderr]     Checking encoding-index-simpchinese v1.20141219.5
[INFO] [stderr]     Checking encoding-index-singlebyte v1.20141219.5
[INFO] [stderr]     Checking encoding-index-korean v1.20141219.5
[INFO] [stderr]     Checking encoding-index-japanese v1.20141219.5
[INFO] [stderr]     Checking deflate v0.9.1
[INFO] [stderr]     Checking inflate v0.4.5
[INFO] [stderr]     Checking deflate v1.0.0
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling miniz_oxide v0.4.4
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]    Compiling num-rational v0.4.0
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]     Checking gif v0.11.3
[INFO] [stderr]     Checking spin v0.9.2
[INFO] [stderr]    Compiling nfd2 v0.3.0
[INFO] [stderr]     Checking encoding v0.2.33
[INFO] [stderr]     Checking crossbeam-channel v0.5.2
[INFO] [stderr]    Compiling quote v1.0.14
[INFO] [stderr]     Checking png v0.17.2
[INFO] [stderr]     Checking num_cpus v1.13.1
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking flate2 v1.0.22
[INFO] [stderr]     Checking crossbeam-deque v0.8.1
[INFO] [stderr]     Checking nanorand v0.6.1
[INFO] [stderr]     Checking threadpool v1.8.1
[INFO] [stderr]     Checking tiff v0.7.1
[INFO] [stderr]     Checking jpeg-decoder v0.2.1
[INFO] [stderr]    Compiling pin-project-internal v1.0.10
[INFO] [stderr]     Checking pin-project v1.0.10
[INFO] [stderr]     Checking flume v0.10.10
[INFO] [stderr]     Checking exr v1.4.1
[INFO] [stderr]     Checking image v0.24.0
[INFO] [stderr]     Checking petpet v2.1.1
[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/petpet-2.1.1/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] running `Command { std: "docker" "inspect" "4d3810dff78dafcfac08bcea59f6c2316273f4ed8a08fdeebc1f117933e9abd5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4d3810dff78dafcfac08bcea59f6c2316273f4ed8a08fdeebc1f117933e9abd5", kill_on_drop: false }`
[INFO] [stdout] 4d3810dff78dafcfac08bcea59f6c2316273f4ed8a08fdeebc1f117933e9abd5