[INFO] fetching crate pgc 0.3.0...
[INFO] documenting pgc-0.3.0 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate pgc 0.3.0 into /workspace/builds/worker-34/source
[INFO] validating manifest of crates.io crate pgc 0.3.0 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 pgc 0.3.0
[INFO] finished tweaking crates.io crate pgc 0.3.0
[INFO] tweaked toml for crates.io crate pgc 0.3.0 written to /workspace/builds/worker-34/source/Cargo.toml
[INFO] crate crates.io crate pgc 0.3.0 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 smallvec v0.6.10
[INFO] [stderr]   Downloaded c2-chacha v0.2.2
[INFO] [stderr]   Downloaded lock_api v0.3.1
[INFO] [stderr]   Downloaded crossbeam-deque v0.7.1
[INFO] [stderr]   Downloaded cc v1.0.45
[INFO] [stderr]   Downloaded cmake v0.1.42
[INFO] [stderr]   Downloaded ppv-lite86 v0.2.5
[INFO] [stderr]   Downloaded bitflags v1.2.0
[INFO] [stderr]   Downloaded getrandom v0.1.12
[INFO] [stderr]   Downloaded mimalloc v0.1.9
[INFO] [stderr]   Downloaded libmimalloc-sys v0.1.6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-34/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-34/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] d54c1fe8c6bb4725b5895055cedab8f45243417b45852666863a496ab2d9c243
[INFO] running `Command { std: "docker" "start" "-a" "d54c1fe8c6bb4725b5895055cedab8f45243417b45852666863a496ab2d9c243", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d54c1fe8c6bb4725b5895055cedab8f45243417b45852666863a496ab2d9c243", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d54c1fe8c6bb4725b5895055cedab8f45243417b45852666863a496ab2d9c243", kill_on_drop: false }`
[INFO] [stdout] d54c1fe8c6bb4725b5895055cedab8f45243417b45852666863a496ab2d9c243
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-34/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-34/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] 5f16bb7dbe853add4f1718cbc95ffb8c5196871c49a2cbaeb83cd0140a25aa7e
[INFO] running `Command { std: "docker" "start" "-a" "5f16bb7dbe853add4f1718cbc95ffb8c5196871c49a2cbaeb83cd0140a25aa7e", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.62
[INFO] [stderr]    Compiling cc v1.0.45
[INFO] [stderr]    Compiling getrandom v0.1.12
[INFO] [stderr]    Compiling arrayvec v0.4.11
[INFO] [stderr]     Checking scopeguard v1.0.0
[INFO] [stderr]     Checking nodrop v0.1.13
[INFO] [stderr]     Checking ppv-lite86 v0.2.5
[INFO] [stderr]     Checking smallvec v0.6.10
[INFO] [stderr]     Checking crossbeam-utils v0.6.6
[INFO] [stderr]    Compiling memoffset v0.5.1
[INFO] [stderr]     Checking lock_api v0.3.1
[INFO] [stderr]    Compiling cmake v0.1.42
[INFO] [stderr]     Checking c2-chacha v0.2.2
[INFO] [stderr]    Compiling libmimalloc-sys v0.1.6
[INFO] [stderr]     Checking crossbeam-epoch v0.7.2
[INFO] [stderr]     Checking num_cpus v1.10.1
[INFO] [stderr]     Checking parking_lot_core v0.6.2
[INFO] [stderr]     Checking time v0.1.42
[INFO] [stderr]     Checking threadpool v1.7.1
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking crossbeam-deque v0.7.1
[INFO] [stderr]     Checking parking_lot v0.9.0
[INFO] [stderr]     Checking rand_chacha v0.2.1
[INFO] [stderr]     Checking rand v0.7.2
[INFO] [stderr]     Checking mimalloc v0.1.9
[INFO] [stderr]  Documenting pgc v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 8 | #![feature(coerce_unsized)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:9:12
[INFO] [stdout]   |
[INFO] [stdout] 9 | #![feature(unsize)]
[INFO] [stdout]   |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `pgc`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name pgc src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=e6ad2fdd41f1aee8 -L dependency=/opt/rustwide/target/debug/deps --extern crossbeam_deque=/opt/rustwide/target/debug/deps/libcrossbeam_deque-958092514c3a704d.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-1479f2b7adeaa2b6.rmeta --extern libc=/opt/rustwide/target/debug/deps/liblibc-4450f767581a3e10.rmeta --extern mimalloc=/opt/rustwide/target/debug/deps/libmimalloc-8a2fc43fc46d88c3.rmeta --extern num_cpus=/opt/rustwide/target/debug/deps/libnum_cpus-092628e049a6cccf.rmeta --extern parking_lot=/opt/rustwide/target/debug/deps/libparking_lot-ebfb52ef4d57b781.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-e66a12b27cb6cd74.rmeta --extern scoped_threadpool=/opt/rustwide/target/debug/deps/libscoped_threadpool-93c6eec8524fa30c.rmeta --extern threadpool=/opt/rustwide/target/debug/deps/libthreadpool-e360bddd80156995.rmeta --extern time=/opt/rustwide/target/debug/deps/libtime-c5f614d943f73537.rmeta --cap-lints=warn --crate-version 0.3.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "5f16bb7dbe853add4f1718cbc95ffb8c5196871c49a2cbaeb83cd0140a25aa7e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5f16bb7dbe853add4f1718cbc95ffb8c5196871c49a2cbaeb83cd0140a25aa7e", kill_on_drop: false }`
[INFO] [stdout] 5f16bb7dbe853add4f1718cbc95ffb8c5196871c49a2cbaeb83cd0140a25aa7e