[INFO] fetching crate mcproto-rs 0.2.0...
[INFO] documenting mcproto-rs-0.2.0 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate mcproto-rs 0.2.0 into /workspace/builds/worker-27/source
[INFO] validating manifest of crates.io crate mcproto-rs 0.2.0 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "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-27/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 04aefe8a3da716ae9eaef7d9ab0d7ffd7cdf41a6d684691a61714b4b31096920
[INFO] running `Command { std: "docker" "start" "-a" "04aefe8a3da716ae9eaef7d9ab0d7ffd7cdf41a6d684691a61714b4b31096920", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "04aefe8a3da716ae9eaef7d9ab0d7ffd7cdf41a6d684691a61714b4b31096920", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "04aefe8a3da716ae9eaef7d9ab0d7ffd7cdf41a6d684691a61714b4b31096920", kill_on_drop: false }`
[INFO] [stdout] 04aefe8a3da716ae9eaef7d9ab0d7ffd7cdf41a6d684691a61714b4b31096920
[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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] aed15685defef5223f48a88cc69b02c5a43381f48793befae1a202cf7290ca5e
[INFO] running `Command { std: "docker" "start" "-a" "aed15685defef5223f48a88cc69b02c5a43381f48793befae1a202cf7290ca5e", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]    Compiling serde v1.0.127
[INFO] [stderr]    Compiling serde_json v1.0.66
[INFO] [stderr]     Checking base64 v0.12.3
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[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:1:32
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![cfg_attr(feature = "bench", feature(test))]
[INFO] [stdout]   |                                ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[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: `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 --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern base64=/opt/rustwide/target/debug/deps/libbase64-01045cdf78b15d60.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-439732ba5f207e6a.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-3353d47a6f1a1a64.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-425577273edab9b0.rmeta --cap-lints=warn --crate-version 0.2.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "aed15685defef5223f48a88cc69b02c5a43381f48793befae1a202cf7290ca5e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aed15685defef5223f48a88cc69b02c5a43381f48793befae1a202cf7290ca5e", kill_on_drop: false }`
[INFO] [stdout] aed15685defef5223f48a88cc69b02c5a43381f48793befae1a202cf7290ca5e
