[INFO] fetching crate forcast-async 0.1.0...
[INFO] documenting forcast-async-0.1.0 against 1.76.0 for beta-1.77-rustdoc-1
[INFO] extracting crate forcast-async 0.1.0 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate forcast-async 0.1.0 on toolchain 1.76.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.76.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate forcast-async 0.1.0
[INFO] finished tweaking crates.io crate forcast-async 0.1.0
[INFO] tweaked toml for crates.io crate forcast-async 0.1.0 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.76.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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" "+1.76.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.76.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e5bfee36026cd0b76a40e900552a1231a6cd80f1fd69224d2de8e91856fc6ffd
[INFO] running `Command { std: "docker" "start" "-a" "e5bfee36026cd0b76a40e900552a1231a6cd80f1fd69224d2de8e91856fc6ffd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e5bfee36026cd0b76a40e900552a1231a6cd80f1fd69224d2de8e91856fc6ffd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e5bfee36026cd0b76a40e900552a1231a6cd80f1fd69224d2de8e91856fc6ffd", kill_on_drop: false }`
[INFO] [stdout] e5bfee36026cd0b76a40e900552a1231a6cd80f1fd69224d2de8e91856fc6ffd
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.76.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2405b2a56d4a0b8766803c681400662c683f5af5ee1e07e21e616a82b25f9c27
[INFO] running `Command { std: "docker" "start" "-a" "2405b2a56d4a0b8766803c681400662c683f5af5ee1e07e21e616a82b25f9c27", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.153
[INFO] [stderr]     Checking futures v0.1.31
[INFO] [stderr]    Compiling semver-parser v0.7.0
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[INFO] [stderr]    Compiling crossbeam-epoch v0.8.2
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[INFO] [stderr]    Compiling rand_pcg v0.1.2
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[INFO] [stderr]    Compiling unicode-xid v0.2.4
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[INFO] [stderr]     Checking memchr v2.7.1
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[INFO] [stderr]    Compiling quote v1.0.35
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[INFO] [stderr]    Compiling cc v1.0.83
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[INFO] [stderr]    Compiling synstructure v0.12.6
[INFO] [stderr]    Compiling openssl-sys v0.9.99
[INFO] [stderr]    Compiling backtrace v0.3.69
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[INFO] [stderr]     Checking http-body v0.1.0
[INFO] [stderr]    Compiling serde_derive v1.0.196
[INFO] [stderr]    Compiling openssl-macros v0.1.1
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]     Checking serde v1.0.196
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[INFO] [stderr]  Documenting forcast-async v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(trait_alias)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 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 `forcast-async`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/1.76.0-x86_64-unknown-linux-gnu/bin/rustdoc --crate-type lib --crate-name forcast_async src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=62082d1546ba2ec2 -L dependency=/opt/rustwide/target/debug/deps --extern futures=/opt/rustwide/target/debug/deps/libfutures-45a10f53aca908f9.rmeta --extern itertools=/opt/rustwide/target/debug/deps/libitertools-2381a80e99553603.rmeta --extern reqwest=/opt/rustwide/target/debug/deps/libreqwest-48678dd93206a56d.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-1494ecb3a2331459.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-13ea746cbf5b193e.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-bf524509d3a07477.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "2405b2a56d4a0b8766803c681400662c683f5af5ee1e07e21e616a82b25f9c27", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2405b2a56d4a0b8766803c681400662c683f5af5ee1e07e21e616a82b25f9c27", kill_on_drop: false }`
[INFO] [stdout] 2405b2a56d4a0b8766803c681400662c683f5af5ee1e07e21e616a82b25f9c27
