[INFO] fetching crate simple-uuid 0.5.1...
[INFO] documenting simple-uuid-0.5.1 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate simple-uuid 0.5.1 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate simple-uuid 0.5.1 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 simple-uuid 0.5.1
[INFO] finished tweaking crates.io crate simple-uuid 0.5.1
[INFO] tweaked toml for crates.io crate simple-uuid 0.5.1 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[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 md5 v0.7.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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] 9e2a5089dec4b36d109351781221576895863e925cb77bdb5189efb7293d83aa
[INFO] running `Command { std: "docker" "start" "-a" "9e2a5089dec4b36d109351781221576895863e925cb77bdb5189efb7293d83aa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9e2a5089dec4b36d109351781221576895863e925cb77bdb5189efb7293d83aa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9e2a5089dec4b36d109351781221576895863e925cb77bdb5189efb7293d83aa", kill_on_drop: false }`
[INFO] [stdout] 9e2a5089dec4b36d109351781221576895863e925cb77bdb5189efb7293d83aa
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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] 431a830f803686a4a9b7658c7f4cb4b5c987982b27726ee46accaaa586746cf7
[INFO] running `Command { std: "docker" "start" "-a" "431a830f803686a4a9b7658c7f4cb4b5c987982b27726ee46accaaa586746cf7", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking bitflags v1.3.2
[INFO] [stderr]     Checking sha1_smol v1.0.0
[INFO] [stderr]     Checking md5 v0.7.0
[INFO] [stderr]     Checking sha1 v0.6.1
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]     Checking getrandom v0.2.6
[INFO] [stderr]     Checking nix v0.23.1
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking mac_address v1.1.3
[INFO] [stderr]  Documenting simple-uuid v0.5.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:16:1
[INFO] [stdout]    |
[INFO] [stdout] 16 | #![feature(doc_cfg)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not document `simple-uuid`
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] Caused by:
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name simple_uuid src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --cfg 'feature="hash_md5"' --cfg 'feature="hash_sha1"' --cfg 'feature="mac_addr"' --cfg 'feature="mac_address"' --cfg 'feature="md5"' --cfg 'feature="rand_core"' --cfg 'feature="rand_num"' --cfg 'feature="sha1"' --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=1c7432ad08a1b418 -L dependency=/opt/rustwide/target/debug/deps --extern mac_address=/opt/rustwide/target/debug/deps/libmac_address-04e2238122812221.rmeta --extern md5=/opt/rustwide/target/debug/deps/libmd5-05cdc6da942a1386.rmeta --extern rand_core=/opt/rustwide/target/debug/deps/librand_core-5c8a75dbacb9959e.rmeta --extern sha1=/opt/rustwide/target/debug/deps/libsha1-030ea0a61df7b2cc.rmeta --cap-lints=warn --crate-version 0.5.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "431a830f803686a4a9b7658c7f4cb4b5c987982b27726ee46accaaa586746cf7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "431a830f803686a4a9b7658c7f4cb4b5c987982b27726ee46accaaa586746cf7", kill_on_drop: false }`
[INFO] [stdout] 431a830f803686a4a9b7658c7f4cb4b5c987982b27726ee46accaaa586746cf7