[INFO] fetching crate kc 0.5.0...
[INFO] documenting kc-0.5.0 against 1.69.0 for beta-1.70-rustdoc-1
[INFO] extracting crate kc 0.5.0 into /workspace/builds/worker-1-tc1/source
[INFO] validating manifest of crates.io crate kc 0.5.0 on toolchain 1.69.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.69.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-1-tc1/source/.cargo/config.toml
[INFO] started tweaking crates.io crate kc 0.5.0
[INFO] finished tweaking crates.io crate kc 0.5.0
[INFO] tweaked toml for crates.io crate kc 0.5.0 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate crates.io crate kc 0.5.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.69.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded globset v0.4.9
[INFO] [stderr]   Downloaded terminal_size v0.2.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+1.69.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6e57c2f65e0acfdfd9002a13f6c398f18771c68c7b45f7fd973f6b91f8ab5dde
[INFO] running `Command { std: "docker" "start" "-a" "6e57c2f65e0acfdfd9002a13f6c398f18771c68c7b45f7fd973f6b91f8ab5dde", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6e57c2f65e0acfdfd9002a13f6c398f18771c68c7b45f7fd973f6b91f8ab5dde", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6e57c2f65e0acfdfd9002a13f6c398f18771c68c7b45f7fd973f6b91f8ab5dde", kill_on_drop: false }`
[INFO] [stdout] 6e57c2f65e0acfdfd9002a13f6c398f18771c68c7b45f7fd973f6b91f8ab5dde
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+1.69.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a3d2dc42c0d538cbea0d44821f0251ac3b4679164b5ee6a61581369d75070e37
[INFO] running `Command { std: "docker" "start" "-a" "a3d2dc42c0d538cbea0d44821f0251ac3b4679164b5ee6a61581369d75070e37", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.140
[INFO] [stderr]    Compiling io-lifetimes v1.0.9
[INFO] [stderr]    Compiling rustix v0.36.11
[INFO] [stderr]    Compiling crossbeam-utils v0.8.10
[INFO] [stderr]     Checking regex-syntax v0.6.27
[INFO] [stderr]     Checking fnv v1.0.7
[INFO] [stderr]     Checking linux-raw-sys v0.1.4
[INFO] [stderr]     Checking same-file v1.0.6
[INFO] [stderr]     Checking thread_local v1.1.4
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]     Checking bstr v0.2.17
[INFO] [stderr]     Checking walkdir v2.3.2
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking colored v2.0.0
[INFO] [stderr]     Checking regex v1.6.0
[INFO] [stderr]     Checking globset v0.4.9
[INFO] [stderr]     Checking terminal_size v0.2.5
[INFO] [stderr]     Checking ignore v0.4.18
[INFO] [stderr]  Documenting kc v0.5.0 (/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(io_error_more)]
[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 `kc`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2021 --crate-type bin --crate-name kc src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=888085761457affe -L dependency=/opt/rustwide/target/debug/deps --extern colored=/opt/rustwide/target/debug/deps/libcolored-bc4f1bf621c28eff.rmeta --extern ignore=/opt/rustwide/target/debug/deps/libignore-cd73cecdf77c0316.rmeta --extern terminal_size=/opt/rustwide/target/debug/deps/libterminal_size-916376c97923f274.rmeta --cap-lints=warn --crate-version 0.5.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "a3d2dc42c0d538cbea0d44821f0251ac3b4679164b5ee6a61581369d75070e37", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a3d2dc42c0d538cbea0d44821f0251ac3b4679164b5ee6a61581369d75070e37", kill_on_drop: false }`
[INFO] [stdout] a3d2dc42c0d538cbea0d44821f0251ac3b4679164b5ee6a61581369d75070e37
