[INFO] cloning repository https://github.com/Vawheter/SimpleZKCP
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Vawheter/SimpleZKCP" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FVawheter%2FSimpleZKCP", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FVawheter%2FSimpleZKCP'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 96aa4a1c2b0e1e7d432510a48ef6f6a635b70463
[INFO] documenting Vawheter/SimpleZKCP 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%2FVawheter%2FSimpleZKCP" "/workspace/builds/worker-27/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-27/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Vawheter/SimpleZKCP 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/Vawheter/SimpleZKCP
[INFO] finished tweaking git repo https://github.com/Vawheter/SimpleZKCP
[INFO] tweaked toml for git repo https://github.com/Vawheter/SimpleZKCP written to /workspace/builds/worker-27/source/Cargo.toml
[INFO] crate git repo https://github.com/Vawheter/SimpleZKCP 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 byteorder v0.3.13
[INFO] [stderr]   Downloaded fixedbitset v0.1.0
[INFO] [stderr]   Downloaded flate2 v0.2.11
[INFO] [stderr]   Downloaded encoding v0.2.32
[INFO] [stderr]   Downloaded hex v0.1.0
[INFO] [stderr]   Downloaded bincode v0.4.0
[INFO] [stderr]   Downloaded gcc v0.3.21
[INFO] [stderr]   Downloaded rust-crypto v0.2.34
[INFO] [stderr]   Downloaded serde v0.6.6
[INFO] [stderr]   Downloaded thread-scoped v1.0.1
[INFO] [stderr]   Downloaded bzip2 v0.2.3
[INFO] [stderr]   Downloaded whiteread v0.2.0
[INFO] [stderr]   Downloaded strason v0.3.3
[INFO] [stderr]   Downloaded bzip2-sys v0.1.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/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] 0bdca89cb47c110369689da91e64e0234873d775af08b950b2172390d9ce07a9
[INFO] running `Command { std: "docker" "start" "-a" "0bdca89cb47c110369689da91e64e0234873d775af08b950b2172390d9ce07a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0bdca89cb47c110369689da91e64e0234873d775af08b950b2172390d9ce07a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0bdca89cb47c110369689da91e64e0234873d775af08b950b2172390d9ce07a9", kill_on_drop: false }`
[INFO] [stdout] 0bdca89cb47c110369689da91e64e0234873d775af08b950b2172390d9ce07a9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/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] 83f716b143168983a22b18dc00905262f9f7734785602ba7380c9f9453402491
[INFO] running `Command { std: "docker" "start" "-a" "83f716b143168983a22b18dc00905262f9f7734785602ba7380c9f9453402491", 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]    Compiling libc v0.2.74
[INFO] [stderr]    Compiling gcc v0.3.21
[INFO] [stderr]     Checking winapi v0.2.5
[INFO] [stderr]     Checking rustc-serialize v0.3.24
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]     Checking libc v0.1.12
[INFO] [stderr]     Checking unicode-width v0.1.8
[INFO] [stderr]     Checking strsim v0.8.0
[INFO] [stderr]     Checking ansi_term v0.11.0
[INFO] [stderr]     Checking byteorder v0.3.13
[INFO] [stderr]     Checking vec_map v0.8.2
[INFO] [stderr]     Checking thread-scoped v1.0.1
[INFO] [stderr]     Checking hex v0.1.0
[INFO] [stderr]     Checking whiteread v0.2.0
[INFO] [stderr]     Checking fixedbitset v0.1.0
[INFO] [stderr]    Compiling advapi32-sys v0.1.2
[INFO] [stderr]    Compiling kernel32-sys v0.2.1
[INFO] [stderr]     Checking encoding v0.2.32
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]    Compiling bzip2-sys v0.1.3
[INFO] [stderr]    Compiling miniz-sys v0.1.7
[INFO] [stderr]    Compiling rust-crypto v0.2.34
[INFO] [stderr]     Checking rand v0.3.12
[INFO] [stderr]     Checking time v0.1.34
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]     Checking flate2 v0.2.11
[INFO] [stderr]     Checking num v0.1.28
[INFO] [stderr]     Checking bzip2 v0.2.3
[INFO] [stderr]     Checking serde v0.6.6
[INFO] [stderr]     Checking strason v0.3.3
[INFO] [stderr]     Checking bincode v0.4.0
[INFO] [stderr]  Documenting pay-to-sudoku v0.0.1 (/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(test)]
[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 `pay-to-sudoku`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type bin --crate-name pay_to_sudoku src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=c67d05f62dcdad03 -L dependency=/opt/rustwide/target/debug/deps --extern bincode=/opt/rustwide/target/debug/deps/libbincode-3ab78b41857b1357.rmeta --extern bzip2=/opt/rustwide/target/debug/deps/libbzip2-e1101e861cebb556.rmeta --extern clap=/opt/rustwide/target/debug/deps/libclap-f50c9a0770f771a6.rmeta --extern fixedbitset=/opt/rustwide/target/debug/deps/libfixedbitset-42ad403f82555fd3.rmeta --extern flate2=/opt/rustwide/target/debug/deps/libflate2-716d8cf827ee68bf.rmeta --extern hex=/opt/rustwide/target/debug/deps/libhex-ab09d730dc956d94.rmeta --extern libc=/opt/rustwide/target/debug/deps/liblibc-1d5365383565f530.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-c5eae1301f6dd753.rmeta --extern crypto=/opt/rustwide/target/debug/deps/libcrypto-63ec16dc0fc3479a.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-6258e4bb5858960b.rmeta --extern strason=/opt/rustwide/target/debug/deps/libstrason-4e33e73ef151a5da.rmeta --extern thread_scoped=/opt/rustwide/target/debug/deps/libthread_scoped-785c91fe4f14e149.rmeta --extern whiteread=/opt/rustwide/target/debug/deps/libwhiteread-60a6ee267b54a1cc.rmeta --cap-lints=warn --crate-version 0.0.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "83f716b143168983a22b18dc00905262f9f7734785602ba7380c9f9453402491", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "83f716b143168983a22b18dc00905262f9f7734785602ba7380c9f9453402491", kill_on_drop: false }`
[INFO] [stdout] 83f716b143168983a22b18dc00905262f9f7734785602ba7380c9f9453402491