[INFO] cloning repository https://github.com/ToucheSir/db_tutorial
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ToucheSir/db_tutorial" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FToucheSir%2Fdb_tutorial", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FToucheSir%2Fdb_tutorial'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ae57ceba3427ce2fc15e9270affc1017ba6a19b8
[INFO] documenting ToucheSir/db_tutorial 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%2FToucheSir%2Fdb_tutorial" "/workspace/builds/worker-36/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-36/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ToucheSir/db_tutorial 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/ToucheSir/db_tutorial
[INFO] finished tweaking git repo https://github.com/ToucheSir/db_tutorial
[INFO] tweaked toml for git repo https://github.com/ToucheSir/db_tutorial written to /workspace/builds/worker-36/source/Cargo.toml
[INFO] crate git repo https://github.com/ToucheSir/db_tutorial 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]  Downloading crates ...
[INFO] [stderr]   Downloaded serde_derive v1.0.21
[INFO] [stderr]   Downloaded serde v1.0.21
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/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] c3696743fd2eef189b21639ab71138e6a53b78d97e6e3480255ebef210cfb4fb
[INFO] running `Command { std: "docker" "start" "-a" "c3696743fd2eef189b21639ab71138e6a53b78d97e6e3480255ebef210cfb4fb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c3696743fd2eef189b21639ab71138e6a53b78d97e6e3480255ebef210cfb4fb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c3696743fd2eef189b21639ab71138e6a53b78d97e6e3480255ebef210cfb4fb", kill_on_drop: false }`
[INFO] [stdout] c3696743fd2eef189b21639ab71138e6a53b78d97e6e3480255ebef210cfb4fb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-36/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] ebc40183f25c4142666e854674b7fd8667c0cd4ae767ff1ee3cd72918e922437
[INFO] running `Command { std: "docker" "start" "-a" "ebc40183f25c4142666e854674b7fd8667c0cd4ae767ff1ee3cd72918e922437", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling unicode-xid v0.0.4
[INFO] [stderr]    Compiling quote v0.3.15
[INFO] [stderr]     Checking byteorder v1.1.0
[INFO] [stderr]     Checking serde v1.0.21
[INFO] [stderr]    Compiling synom v0.11.3
[INFO] [stderr]    Compiling syn v0.11.11
[INFO] [stderr]    Compiling serde_derive_internals v0.17.0
[INFO] [stderr]    Compiling serde_derive v1.0.21
[INFO] [stderr]     Checking bincode v0.9.2
[INFO] [stderr]  Documenting db_tutorial 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(const_size_of)]
[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 `db_tutorial`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type bin --crate-name db_tutorial src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=81920640e2a61980 -L dependency=/opt/rustwide/target/debug/deps --extern bincode=/opt/rustwide/target/debug/deps/libbincode-a6e8de74624da847.rmeta --extern byteorder=/opt/rustwide/target/debug/deps/libbyteorder-e0514089ee589b15.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-12c0e3a9dc0dcfc4.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-55ea041209b19a5e.so --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "ebc40183f25c4142666e854674b7fd8667c0cd4ae767ff1ee3cd72918e922437", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ebc40183f25c4142666e854674b7fd8667c0cd4ae767ff1ee3cd72918e922437", kill_on_drop: false }`
[INFO] [stdout] ebc40183f25c4142666e854674b7fd8667c0cd4ae767ff1ee3cd72918e922437