[INFO] cloning repository https://github.com/gamgi/pregex
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/gamgi/pregex" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgamgi%2Fpregex", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgamgi%2Fpregex'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c07eedbcb8d9b81546006671308b2639064d86bc
[INFO] documenting gamgi/pregex 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%2Fgamgi%2Fpregex" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/gamgi/pregex 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/gamgi/pregex
[INFO] finished tweaking git repo https://github.com/gamgi/pregex
[INFO] tweaked toml for git repo https://github.com/gamgi/pregex written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/gamgi/pregex 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]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded clap v3.0.10
[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] 1ec2b39ce68ebc3eb32acb33826091df09539827844c0979bbe0a3a77ea76d68
[INFO] running `Command { std: "docker" "start" "-a" "1ec2b39ce68ebc3eb32acb33826091df09539827844c0979bbe0a3a77ea76d68", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1ec2b39ce68ebc3eb32acb33826091df09539827844c0979bbe0a3a77ea76d68", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1ec2b39ce68ebc3eb32acb33826091df09539827844c0979bbe0a3a77ea76d68", kill_on_drop: false }`
[INFO] [stdout] 1ec2b39ce68ebc3eb32acb33826091df09539827844c0979bbe0a3a77ea76d68
[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] 143c40ab1634b9bcfd357ea42d1ac058784580dce22dadacbd348317035b3fc0
[INFO] running `Command { std: "docker" "start" "-a" "143c40ab1634b9bcfd357ea42d1ac058784580dce22dadacbd348317035b3fc0", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling libc v0.2.106
[INFO] [stderr]    Compiling libm v0.2.1
[INFO] [stderr]    Compiling proc-macro2 v1.0.32
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.81
[INFO] [stderr]     Checking ppv-lite86 v0.2.15
[INFO] [stderr]    Compiling ucd-trie v0.1.3
[INFO] [stderr]    Compiling typenum v1.14.0
[INFO] [stderr]    Compiling paste v1.0.6
[INFO] [stderr]    Compiling maplit v1.0.2
[INFO] [stderr]     Checking rawpointer v0.2.1
[INFO] [stderr]     Checking regex-syntax v0.6.25
[INFO] [stderr]     Checking hashbrown v0.11.2
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]    Compiling pest v2.1.3
[INFO] [stderr]     Checking log v0.4.14
[INFO] [stderr]     Checking itertools v0.10.1
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-rational v0.4.0
[INFO] [stderr]    Compiling indexmap v1.8.0
[INFO] [stderr]     Checking matrixmultiply v0.3.1
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking regex v1.5.4
[INFO] [stderr]    Compiling pest_meta v2.1.3
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.4
[INFO] [stderr]     Checking approx v0.5.0
[INFO] [stderr]     Checking num-complex v0.4.0
[INFO] [stderr]     Checking clap v3.0.10
[INFO] [stderr]     Checking env_logger v0.8.4
[INFO] [stderr]     Checking simba v0.5.1
[INFO] [stderr]     Checking rand_distr v0.4.2
[INFO] [stderr]    Compiling pest_generator v2.1.3
[INFO] [stderr]    Compiling nalgebra-macros v0.1.0
[INFO] [stderr]    Compiling pest_derive v2.1.0
[INFO] [stderr]     Checking nalgebra v0.27.1
[INFO] [stderr]     Checking statrs v0.15.0
[INFO] [stderr]  Documenting pregex v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(hash_drain_filter)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unresolved link to `1968`
[INFO] [stdout]   --> src/nfa.rs:79:54
[INFO] [stdout]    |
[INFO] [stdout] 79 | /// represent partial NFA states following Thompson [1968].
[INFO] [stdout]    |                                                      ^^^^ no item named `1968` in scope
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(rustdoc::broken_intra_doc_links)]` on by default
[INFO] [stdout]    = help: to escape `[` and `]` characters, add '\' before them like `\[` or `\]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `pregex`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2021 --crate-type bin --crate-name pregex src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=bd5b1cf254e7ec38 -L dependency=/opt/rustwide/target/debug/deps --extern clap=/opt/rustwide/target/debug/deps/libclap-e3750327d73f9ee9.rmeta --extern env_logger=/opt/rustwide/target/debug/deps/libenv_logger-ad5ff3cd9f5b3b7b.rmeta --extern itertools=/opt/rustwide/target/debug/deps/libitertools-768244cffa2ddad5.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-1e3c371ab90a7930.rmeta --extern pest=/opt/rustwide/target/debug/deps/libpest-ad621116ccc3017c.rmeta --extern pest_derive=/opt/rustwide/target/debug/deps/libpest_derive-8e50fe98d655484a.so --extern statrs=/opt/rustwide/target/debug/deps/libstatrs-ee457194c581529b.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "143c40ab1634b9bcfd357ea42d1ac058784580dce22dadacbd348317035b3fc0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "143c40ab1634b9bcfd357ea42d1ac058784580dce22dadacbd348317035b3fc0", kill_on_drop: false }`
[INFO] [stdout] 143c40ab1634b9bcfd357ea42d1ac058784580dce22dadacbd348317035b3fc0