[INFO] cloning repository https://github.com/perspect3vism/local-perspective-diff-sync
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/perspect3vism/local-perspective-diff-sync" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fperspect3vism%2Flocal-perspective-diff-sync", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fperspect3vism%2Flocal-perspective-diff-sync'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 73edf050b57f04e1c411b017ec5f308ca3c6bca4
[INFO] documenting perspect3vism/local-perspective-diff-sync against 1.61.0 for beta-1.62-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fperspect3vism%2Flocal-perspective-diff-sync" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/perspect3vism/local-perspective-diff-sync 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 git repo https://github.com/perspect3vism/local-perspective-diff-sync
[INFO] finished tweaking git repo https://github.com/perspect3vism/local-perspective-diff-sync
[INFO] tweaked toml for git repo https://github.com/perspect3vism/local-perspective-diff-sync written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/perspect3vism/local-perspective-diff-sync 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 base64ct v1.5.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] e3afa4e3762faf0f9143fc67072a3e6bb02c3e41775a6cea205d20b3aaaf486e
[INFO] running `Command { std: "docker" "start" "-a" "e3afa4e3762faf0f9143fc67072a3e6bb02c3e41775a6cea205d20b3aaaf486e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e3afa4e3762faf0f9143fc67072a3e6bb02c3e41775a6cea205d20b3aaaf486e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e3afa4e3762faf0f9143fc67072a3e6bb02c3e41775a6cea205d20b3aaaf486e", kill_on_drop: false }`
[INFO] [stdout] e3afa4e3762faf0f9143fc67072a3e6bb02c3e41775a6cea205d20b3aaaf486e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 53ff6d55e1dfd5b37c33f97111711c46c10b0a031f852d06aa16901cb54e6581
[INFO] running `Command { std: "docker" "start" "-a" "53ff6d55e1dfd5b37c33f97111711c46c10b0a031f852d06aa16901cb54e6581", kill_on_drop: false }`
[INFO] [stderr]    Compiling typenum v1.15.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.37
[INFO] [stderr]    Compiling version_check v0.9.4
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.91
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling serde_derive v1.0.136
[INFO] [stderr]    Compiling serde v1.0.136
[INFO] [stderr]     Checking hashbrown v0.11.2
[INFO] [stderr]     Checking cpufeatures v0.2.2
[INFO] [stderr]     Checking fixedbitset v0.4.1
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking base64ct v1.5.0
[INFO] [stderr]    Compiling hex-literal v0.3.4
[INFO] [stderr]    Compiling indexmap v1.8.1
[INFO] [stderr]    Compiling generic-array v0.14.5
[INFO] [stderr]    Compiling quote v1.0.17
[INFO] [stderr]     Checking petgraph v0.6.0
[INFO] [stderr]     Checking block-buffer v0.10.2
[INFO] [stderr]     Checking crypto-common v0.1.3
[INFO] [stderr]     Checking digest v0.10.3
[INFO] [stderr]     Checking sha2 v0.10.2
[INFO] [stderr]     Checking bincode v1.3.3
[INFO] [stderr]  Documenting perspective_diff_sync v0.1.0 (/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(map_first_last)]
[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 document `perspective_diff_sync`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2021 --crate-type lib --crate-name perspective_diff_sync_lib src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=bb668e88a36349ab -L dependency=/opt/rustwide/target/debug/deps --extern base64ct=/opt/rustwide/target/debug/deps/libbase64ct-edd71552d88a3848.rmeta --extern bincode=/opt/rustwide/target/debug/deps/libbincode-ddf224633898f066.rmeta --extern hex_literal=/opt/rustwide/target/debug/deps/libhex_literal-20b5cde41b5dca88.so --extern indexmap=/opt/rustwide/target/debug/deps/libindexmap-153f4f690ef855a1.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-1479f2b7adeaa2b6.rmeta --extern petgraph=/opt/rustwide/target/debug/deps/libpetgraph-b29ea48ed98f1ff4.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-cf9fa5cce374d657.rmeta --extern sha2=/opt/rustwide/target/debug/deps/libsha2-9e0f5c8a51d23dc1.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "53ff6d55e1dfd5b37c33f97111711c46c10b0a031f852d06aa16901cb54e6581", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "53ff6d55e1dfd5b37c33f97111711c46c10b0a031f852d06aa16901cb54e6581", kill_on_drop: false }`
[INFO] [stdout] 53ff6d55e1dfd5b37c33f97111711c46c10b0a031f852d06aa16901cb54e6581