[INFO] fetching crate mcproto-rs 0.2.0...
[INFO] documenting mcproto-rs-0.2.0 against 1.75.0 for beta-1.76-rustdoc-1
[INFO] extracting crate mcproto-rs 0.2.0 into /workspace/builds/worker-0-tc1/source
[INFO] validating manifest of crates.io crate mcproto-rs 0.2.0 on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mcproto-rs 0.2.0
[INFO] finished tweaking crates.io crate mcproto-rs 0.2.0
[INFO] tweaked toml for crates.io crate mcproto-rs 0.2.0 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1bf3b9e7c02036dc7367fc893d6d3900062d7a1bdbf29875947a96d6c2a7072a
[INFO] running `Command { std: "docker" "start" "-a" "1bf3b9e7c02036dc7367fc893d6d3900062d7a1bdbf29875947a96d6c2a7072a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1bf3b9e7c02036dc7367fc893d6d3900062d7a1bdbf29875947a96d6c2a7072a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1bf3b9e7c02036dc7367fc893d6d3900062d7a1bdbf29875947a96d6c2a7072a", kill_on_drop: false }`
[INFO] [stdout] 1bf3b9e7c02036dc7367fc893d6d3900062d7a1bdbf29875947a96d6c2a7072a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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" "RUSTFLAGS=--cap-lints=warn" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 53a1b39ee4349a2702e94cb57e805db923c36f2e4f84c2f413d6fed246da5bbc
[INFO] running `Command { std: "docker" "start" "-a" "53a1b39ee4349a2702e94cb57e805db923c36f2e4f84c2f413d6fed246da5bbc", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.76
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]    Compiling serde v1.0.195
[INFO] [stderr]    Compiling serde_json v1.0.111
[INFO] [stderr]     Checking base64 v0.12.3
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]    Compiling quote v1.0.35
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]    Compiling syn v2.0.48
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]    Compiling serde_derive v1.0.195
[INFO] [stderr]  Documenting mcproto-rs v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:40
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![cfg_attr(feature = "bench", 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 `mcproto-rs`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/1.75.0-x86_64-unknown-linux-gnu/bin/rustdoc --edition=2018 --crate-type lib --crate-name mcproto_rs src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="bench"' --cfg 'feature="default"' --cfg 'feature="rand"' --cfg 'feature="std"' --cfg 'feature="v1_15_2"' --cfg 'feature="v1_16_3"' --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=7feaeb64851f1463 -L dependency=/opt/rustwide/target/debug/deps --extern base64=/opt/rustwide/target/debug/deps/libbase64-59cda2cd483a5832.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-d661172a997380c8.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-989a63877cedd464.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-9f11c5d0e8c1f543.rmeta --cap-lints=warn --crate-version 0.2.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "53a1b39ee4349a2702e94cb57e805db923c36f2e4f84c2f413d6fed246da5bbc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "53a1b39ee4349a2702e94cb57e805db923c36f2e4f84c2f413d6fed246da5bbc", kill_on_drop: false }`
[INFO] [stdout] 53a1b39ee4349a2702e94cb57e805db923c36f2e4f84c2f413d6fed246da5bbc
