[INFO] fetching crate shared_slice 0.0.4...
[INFO] documenting shared_slice-0.0.4 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate shared_slice 0.0.4 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate shared_slice 0.0.4 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 shared_slice 0.0.4
[INFO] finished tweaking crates.io crate shared_slice 0.0.4
[INFO] tweaked toml for crates.io crate shared_slice 0.0.4 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[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] 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] [stdout] 76592e4c3398ab25f9f2fcac059c3f8cc10a980ffaf6f07fec841b7c4ec993ed
[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" "76592e4c3398ab25f9f2fcac059c3f8cc10a980ffaf6f07fec841b7c4ec993ed", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "76592e4c3398ab25f9f2fcac059c3f8cc10a980ffaf6f07fec841b7c4ec993ed", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "76592e4c3398ab25f9f2fcac059c3f8cc10a980ffaf6f07fec841b7c4ec993ed", kill_on_drop: false }`
[INFO] [stdout] 76592e4c3398ab25f9f2fcac059c3f8cc10a980ffaf6f07fec841b7c4ec993ed
[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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] d6ab6c70ee3d00831bac8961dfd7466fc6386c75fa4ddf568e26deff17e12ff6
[INFO] running `Command { std: "docker" "start" "-a" "d6ab6c70ee3d00831bac8961dfd7466fc6386c75fa4ddf568e26deff17e12ff6", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Documenting shared_slice v0.0.4 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0259]: the name `core` is defined multiple times
[INFO] [stdout]   --> src/lib.rs:79:1
[INFO] [stdout]    |
[INFO] [stdout] 79 | extern crate core;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^ `core` reimported here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `core` must be defined only once in the type namespace of this module
[INFO] [stdout] help: you can use `as` to change the binding name of the import
[INFO] [stdout]    |
[INFO] [stdout] 79 | extern crate core as other_core;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `alloc::arc`
[INFO] [stdout]  --> src/arc.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 8 | use alloc::arc::{Arc, Weak};
[INFO] [stdout]   |            ^^^ could not find `arc` in `alloc`
[INFO] [stdout] 
[INFO] [stdout] 
[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(no_std)]
[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:76:1
[INFO] [stdout]    |
[INFO] [stdout] 76 | #![feature(core, alloc)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 5 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0259, E0432, E0554.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0259`.
[INFO] [stdout] 
[INFO] [stderr] error: Could not document `shared_slice`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name shared_slice src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "d6ab6c70ee3d00831bac8961dfd7466fc6386c75fa4ddf568e26deff17e12ff6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d6ab6c70ee3d00831bac8961dfd7466fc6386c75fa4ddf568e26deff17e12ff6", kill_on_drop: false }`
[INFO] [stdout] d6ab6c70ee3d00831bac8961dfd7466fc6386c75fa4ddf568e26deff17e12ff6