[INFO] fetching crate components-arena 2.1.0...
[INFO] documenting components-arena-2.1.0 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate components-arena 2.1.0 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate components-arena 2.1.0 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 components-arena 2.1.0
[INFO] finished tweaking crates.io crate components-arena 2.1.0
[INFO] tweaked toml for crates.io crate components-arena 2.1.0 written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] crate crates.io crate components-arena 2.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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] 71db8fb9eb95f63018b1d0ea713291d730594db510664e3467bc4c7754ad5a14
[INFO] running `Command { std: "docker" "start" "-a" "71db8fb9eb95f63018b1d0ea713291d730594db510664e3467bc4c7754ad5a14", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "71db8fb9eb95f63018b1d0ea713291d730594db510664e3467bc4c7754ad5a14", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "71db8fb9eb95f63018b1d0ea713291d730594db510664e3467bc4c7754ad5a14", kill_on_drop: false }`
[INFO] [stdout] 71db8fb9eb95f63018b1d0ea713291d730594db510664e3467bc4c7754ad5a14
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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] 453030a72ee76952fdbbd67f38e3622b1d9821f3a39120d27244f78dcd12aaf3
[INFO] running `Command { std: "docker" "start" "-a" "453030a72ee76952fdbbd67f38e3622b1d9821f3a39120d27244f78dcd12aaf3", kill_on_drop: false }`
[INFO] [stderr]     Checking generics v0.3.2
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]    Compiling enum-ordinalize v3.1.10
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking rand v0.8.4
[INFO] [stderr]    Compiling educe v0.4.18
[INFO] [stderr]     Checking phantom-type v0.3.1
[INFO] [stderr]  Documenting components-arena v2.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:11:32
[INFO] [stdout]    |
[INFO] [stdout] 11 | #![cfg_attr(feature="nightly", feature(const_fn_trait_bound))]
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:13:32
[INFO] [stdout]    |
[INFO] [stdout] 13 | #![cfg_attr(feature="nightly", feature(shrink_to))]
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:14:32
[INFO] [stdout]    |
[INFO] [stdout] 14 | #![cfg_attr(feature="nightly", feature(try_reserve))]
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 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 `components-arena`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name components_arena src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --cfg 'feature="nightly"' --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern educe=/opt/rustwide/target/debug/deps/libeduce-f7733d41a70ec199.so --extern either=/opt/rustwide/target/debug/deps/libeither-e45356c42fa16998.rmeta --extern generics=/opt/rustwide/target/debug/deps/libgenerics-fbb31bd5111111c5.rmeta --extern phantom_type=/opt/rustwide/target/debug/deps/libphantom_type-74ef86b3fa9604f0.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-a975198e56b5241d.rmeta --cap-lints=warn --crate-version 2.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "453030a72ee76952fdbbd67f38e3622b1d9821f3a39120d27244f78dcd12aaf3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "453030a72ee76952fdbbd67f38e3622b1d9821f3a39120d27244f78dcd12aaf3", kill_on_drop: false }`
[INFO] [stdout] 453030a72ee76952fdbbd67f38e3622b1d9821f3a39120d27244f78dcd12aaf3
