[INFO] cloning repository https://github.com/nujz/bellperson-examples
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/nujz/bellperson-examples" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnujz%2Fbellperson-examples", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnujz%2Fbellperson-examples'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e1588efe78ec47a0fce7be1d794850fa3324b17a
[INFO] documenting nujz/bellperson-examples 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%2Fnujz%2Fbellperson-examples" "/workspace/builds/worker-20/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-20/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/nujz/bellperson-examples 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/nujz/bellperson-examples
[INFO] finished tweaking git repo https://github.com/nujz/bellperson-examples
[INFO] tweaked toml for git repo https://github.com/nujz/bellperson-examples written to /workspace/builds/worker-20/source/Cargo.toml
[INFO] crate git repo https://github.com/nujz/bellperson-examples 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 zeroize_derive v1.1.1
[INFO] [stderr]   Downloaded execute-command-tokens v0.1.4
[INFO] [stderr]   Downloaded execute-command-macro-impl v0.1.6
[INFO] [stderr]   Downloaded execute-command-macro v0.1.6
[INFO] [stderr]   Downloaded execute v0.2.9
[INFO] [stderr]   Downloaded blst v0.3.7
[INFO] [stderr]   Downloaded yastl v0.1.2
[INFO] [stderr]   Downloaded bellperson v0.18.2
[INFO] [stderr]   Downloaded blstrs v0.4.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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] 6d80a2c00ef6eaedb6eb8d53af632f2c997d11bcf2691815ab82a59a8e99afb4
[INFO] running `Command { std: "docker" "start" "-a" "6d80a2c00ef6eaedb6eb8d53af632f2c997d11bcf2691815ab82a59a8e99afb4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6d80a2c00ef6eaedb6eb8d53af632f2c997d11bcf2691815ab82a59a8e99afb4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6d80a2c00ef6eaedb6eb8d53af632f2c997d11bcf2691815ab82a59a8e99afb4", kill_on_drop: false }`
[INFO] [stdout] 6d80a2c00ef6eaedb6eb8d53af632f2c997d11bcf2691815ab82a59a8e99afb4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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] 277ae7973a576517ae46c857f6e6c462d5113068e60e469520130ab50b941d44
[INFO] running `Command { std: "docker" "start" "-a" "277ae7973a576517ae46c857f6e6c462d5113068e60e469520130ab50b941d44", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.117
[INFO] [stderr]    Compiling proc-macro2 v1.0.36
[INFO] [stderr]    Compiling syn v1.0.86
[INFO] [stderr]    Compiling radium v0.6.2
[INFO] [stderr]    Compiling typenum v1.15.0
[INFO] [stderr]    Compiling serde_derive v1.0.136
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling tap v1.0.1
[INFO] [stderr]     Checking scopeguard v1.1.0
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[INFO] [stderr]    Compiling serde v1.0.136
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[INFO] [stderr]    Compiling crossbeam-utils v0.8.7
[INFO] [stderr]    Compiling subtle v2.4.1
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]    Compiling execute-command-tokens v0.1.4
[INFO] [stderr]    Compiling byteorder v1.4.3
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.7
[INFO] [stderr]    Compiling rayon-core v1.9.1
[INFO] [stderr]    Compiling opaque-debug v0.3.0
[INFO] [stderr]    Compiling byte-slice-cast v1.2.0
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[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]     Checking arrayvec v0.5.2
[INFO] [stderr]     Checking constant_time_eq v0.1.5
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[INFO] [stderr]    Compiling wyz v0.4.0
[INFO] [stderr]    Compiling rand v0.8.4
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[INFO] [stderr]     Checking crossbeam-channel v0.5.2
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[INFO] [stderr]     Checking getrandom v0.2.4
[INFO] [stderr]    Compiling num_cpus v1.13.1
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[INFO] [stderr]    Compiling threadpool v1.8.1
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[INFO] [stderr]    Compiling digest v0.9.0
[INFO] [stderr]    Compiling synstructure v0.12.6
[INFO] [stderr]     Checking crossbeam-deque v0.8.1
[INFO] [stderr]    Compiling group v0.11.0
[INFO] [stderr]    Compiling sha2 v0.9.9
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]    Compiling pairing v0.21.0
[INFO] [stderr]    Compiling zeroize_derive v1.1.1
[INFO] [stderr]    Compiling execute-command-macro-impl v0.1.6
[INFO] [stderr]    Compiling thiserror-impl v1.0.30
[INFO] [stderr]    Compiling execute-command-macro v0.1.6
[INFO] [stderr]    Compiling zeroize v1.3.0
[INFO] [stderr]    Compiling execute v0.2.9
[INFO] [stderr]     Checking thiserror v1.0.30
[INFO] [stderr]     Checking blstrs v0.4.2
[INFO] [stderr]     Checking bincode v1.3.3
[INFO] [stderr]    Compiling bellperson v0.18.2
[INFO] [stderr]  Documenting bellperson-examples 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:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(option_zip)]
[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 `bellperson-examples`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2021 --crate-type bin --crate-name bellperson_examples src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=26b8d65ab420903b -L dependency=/opt/rustwide/target/debug/deps --extern bellperson=/opt/rustwide/target/debug/deps/libbellperson-cee747c1aca1345b.rmeta --extern blstrs=/opt/rustwide/target/debug/deps/libblstrs-f755f2fa076114be.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-6fed5c39b2a5fd53.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "277ae7973a576517ae46c857f6e6c462d5113068e60e469520130ab50b941d44", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "277ae7973a576517ae46c857f6e6c462d5113068e60e469520130ab50b941d44", kill_on_drop: false }`
[INFO] [stdout] 277ae7973a576517ae46c857f6e6c462d5113068e60e469520130ab50b941d44