[INFO] fetching crate airlang 0.0.3...
[INFO] documenting airlang-0.0.3 against 1.69.0 for beta-1.70-rustdoc-1
[INFO] extracting crate airlang 0.0.3 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate airlang 0.0.3 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] started tweaking crates.io crate airlang 0.0.3
[INFO] finished tweaking crates.io crate airlang 0.0.3
[INFO] tweaked toml for crates.io crate airlang 0.0.3 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" __CARGO_TEST_CHANNEL_OVERRIDE_DO_NOT_USE_THIS="nightly" "/workspace/cargo-home/bin/cargo" "+1.69.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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 az v1.2.1
[INFO] [stderr]   Downloaded rug v1.19.2
[INFO] [stderr]   Downloaded gmp-mpfr-sys v1.5.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 57711f41af7f9e05dd20f18e8b6680e312fa4595f719d4a2e527d7a590fb2466
[INFO] running `Command { std: "docker" "start" "-a" "57711f41af7f9e05dd20f18e8b6680e312fa4595f719d4a2e527d7a590fb2466", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "57711f41af7f9e05dd20f18e8b6680e312fa4595f719d4a2e527d7a590fb2466", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "57711f41af7f9e05dd20f18e8b6680e312fa4595f719d4a2e527d7a590fb2466", kill_on_drop: false }`
[INFO] [stdout] 57711f41af7f9e05dd20f18e8b6680e312fa4595f719d4a2e527d7a590fb2466
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 739539fbe62bd4f8791c59b1b609572bfad6bb9d4e616f7b1ec74aaf152239cf
[INFO] running `Command { std: "docker" "start" "-a" "739539fbe62bd4f8791c59b1b609572bfad6bb9d4e616f7b1ec74aaf152239cf", kill_on_drop: false }`
[INFO] [stderr]    Compiling gmp-mpfr-sys v1.5.2
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling az v1.2.1
[INFO] [stderr]    Compiling rug v1.19.2
[INFO] [stderr]     Checking minimal-lexical v0.2.1
[INFO] [stderr]     Checking rustc-hash v1.1.0
[INFO] [stderr]    Compiling smartstring v1.0.1
[INFO] [stderr]     Checking nom v7.1.3
[INFO] [stderr]  Documenting airlang v0.0.3 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:24:1
[INFO] [stdout]    |
[INFO] [stdout] 24 | / #![feature(
[INFO] [stdout] 25 | |     trait_upcasting,
[INFO] [stdout] 26 | |     trait_alias,
[INFO] [stdout] 27 | |     never_type,
[INFO] [stdout] ...  |
[INFO] [stdout] 36 | |     coerce_unsized
[INFO] [stdout] 37 | | )]
[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 `airlang`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2021 --crate-type lib --crate-name airlang src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=2badae686e4823e8 -L dependency=/opt/rustwide/target/debug/deps --extern nom=/opt/rustwide/target/debug/deps/libnom-ea0c56b64d31b3e5.rmeta --extern rug=/opt/rustwide/target/debug/deps/librug-7e3c610277db8766.rmeta --extern rustc_hash=/opt/rustwide/target/debug/deps/librustc_hash-1904cd8478c1b0ae.rmeta --extern smartstring=/opt/rustwide/target/debug/deps/libsmartstring-de7a561dc373d921.rmeta --extern thiserror=/opt/rustwide/target/debug/deps/libthiserror-b839f3f80c6bc09b.rmeta --cap-lints=warn --crate-version 0.0.3` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "739539fbe62bd4f8791c59b1b609572bfad6bb9d4e616f7b1ec74aaf152239cf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "739539fbe62bd4f8791c59b1b609572bfad6bb9d4e616f7b1ec74aaf152239cf", kill_on_drop: false }`
[INFO] [stdout] 739539fbe62bd4f8791c59b1b609572bfad6bb9d4e616f7b1ec74aaf152239cf
