[INFO] fetching crate components-arena 0.3.0...
[INFO] documenting components-arena-0.3.0 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate components-arena 0.3.0 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate components-arena 0.3.0 on toolchain 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate components-arena 0.3.0
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate components-arena 0.3.0
[INFO] tweaked toml for crates.io crate components-arena 0.3.0 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate crates.io crate components-arena 0.3.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] a3efd640dd7d0317f80380e8da748ec2e517a5f2fc88a1db02776f5543e1a2e4
[INFO] running `Command { std: "docker" "start" "-a" "a3efd640dd7d0317f80380e8da748ec2e517a5f2fc88a1db02776f5543e1a2e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a3efd640dd7d0317f80380e8da748ec2e517a5f2fc88a1db02776f5543e1a2e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a3efd640dd7d0317f80380e8da748ec2e517a5f2fc88a1db02776f5543e1a2e4", kill_on_drop: false }`
[INFO] [stdout] a3efd640dd7d0317f80380e8da748ec2e517a5f2fc88a1db02776f5543e1a2e4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ab56c77f25b6a5f63250105b8792fcf83435b92c9f53eb43ad75951725880062
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "ab56c77f25b6a5f63250105b8792fcf83435b92c9f53eb43ad75951725880062", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.74
[INFO] [stderr]    Compiling syn v1.0.38
[INFO] [stderr]     Checking getrandom v0.1.14
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand_pcg v0.2.1
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]    Compiling derivative v2.1.1
[INFO] [stderr]  Documenting components-arena v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:32
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![cfg_attr(feature="nightly", feature(const_fn))]
[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:3:32
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![cfg_attr(feature="nightly", feature(try_reserve))]
[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:4:32
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![cfg_attr(feature="nightly", feature(shrink_to))]
[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"' --cfg 'feature="once_cell"' --cfg 'feature="std"' --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern derivative=/opt/rustwide/target/debug/deps/libderivative-43e9f1c99c3339c2.so --extern either=/opt/rustwide/target/debug/deps/libeither-b62de5d6d87ac0af.rmeta --extern once_cell=/opt/rustwide/target/debug/deps/libonce_cell-67de5f6a6498d9d2.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-f4dbfda45891ebec.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "ab56c77f25b6a5f63250105b8792fcf83435b92c9f53eb43ad75951725880062", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ab56c77f25b6a5f63250105b8792fcf83435b92c9f53eb43ad75951725880062", kill_on_drop: false }`
[INFO] [stdout] ab56c77f25b6a5f63250105b8792fcf83435b92c9f53eb43ad75951725880062