[INFO] fetching crate kstd 0.0.4...
[INFO] documenting kstd-0.0.4 against 1.75.0 for beta-1.76-rustdoc-1
[INFO] extracting crate kstd 0.0.4 into /workspace/builds/worker-5-tc1/source
[INFO] validating manifest of crates.io crate kstd 0.0.4 on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-5-tc1/source/rust-toolchain.toml
[INFO] started tweaking crates.io crate kstd 0.0.4
[INFO] finished tweaking crates.io crate kstd 0.0.4
[INFO] tweaked toml for crates.io crate kstd 0.0.4 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2c05ae3a56f1d88564007cb8406206e287ce51292c0421bebdd524e4b01e163e
[INFO] running `Command { std: "docker" "start" "-a" "2c05ae3a56f1d88564007cb8406206e287ce51292c0421bebdd524e4b01e163e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2c05ae3a56f1d88564007cb8406206e287ce51292c0421bebdd524e4b01e163e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2c05ae3a56f1d88564007cb8406206e287ce51292c0421bebdd524e4b01e163e", kill_on_drop: false }`
[INFO] [stdout] 2c05ae3a56f1d88564007cb8406206e287ce51292c0421bebdd524e4b01e163e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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" "+1.75.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1a441e97e5c04bde5459aae270e1e31507a7a77ca14b68d74fb2e38e00cbbe69
[INFO] running `Command { std: "docker" "start" "-a" "1a441e97e5c04bde5459aae270e1e31507a7a77ca14b68d74fb2e38e00cbbe69", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling convert_case v0.4.0
[INFO] [stderr]    Compiling derive_more v0.99.17
[INFO] [stderr]  Documenting kstd v0.0.4 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(error_in_core)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unresolved link to `Error::BufferTooSmall`
[INFO] [stdout]   --> src/io/block/mod.rs:20:62
[INFO] [stdout]    |
[INFO] [stdout] 20 |     /// Failing to provide such a buffer will result in an [`Error::BufferTooSmall`].
[INFO] [stdout]    |                                                              ^^^^^^^^^^^^^^^^^^^^^ no item named `Error` in scope
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(rustdoc::broken_intra_doc_links)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unresolved link to `Error::BufferTooSmall`
[INFO] [stdout]   --> src/io/block/mod.rs:24:62
[INFO] [stdout]    |
[INFO] [stdout] 24 |     /// Failing to provide such a buffer will result in an [`Error::BufferTooSmall`].
[INFO] [stdout]    |                                                              ^^^^^^^^^^^^^^^^^^^^^ no item named `Error` in scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unresolved link to `buf`
[INFO] [stdout]  --> src/io/read.rs:4:64
[INFO] [stdout]   |
[INFO] [stdout] 4 |     /// Reads from this source once and places the result in [`buf`].
[INFO] [stdout]   |                                                                ^^^ no item named `buf` in scope
[INFO] [stdout]   |
[INFO] [stdout]   = help: to escape `[` and `]` characters, add '\' before them like `\[` or `\]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unresolved link to `buf`
[INFO] [stdout]  --> src/io/read.rs:6:19
[INFO] [stdout]   |
[INFO] [stdout] 6 |     /// to read [`buf`] fully. For that, see [`Read::read_exact`].
[INFO] [stdout]   |                   ^^^ no item named `buf` in scope
[INFO] [stdout]   |
[INFO] [stdout]   = help: to escape `[` and `]` characters, add '\' before them like `\[` or `\]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unresolved link to `buf`
[INFO] [stdout]   --> src/io/read.rs:37:83
[INFO] [stdout]    |
[INFO] [stdout] 37 |     /// Reads from this source at the specified offset and places the result in [`buf`].
[INFO] [stdout]    |                                                                                   ^^^ no item named `buf` in scope
[INFO] [stdout]    |
[INFO] [stdout]    = help: to escape `[` and `]` characters, add '\' before them like `\[` or `\]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unresolved link to `buf`
[INFO] [stdout]   --> src/io/read.rs:38:50
[INFO] [stdout]    |
[INFO] [stdout] 38 |     /// This method does not guarantee to read [`buf`] fully. If that is your requirement,
[INFO] [stdout]    |                                                  ^^^ no item named `buf` in scope
[INFO] [stdout]    |
[INFO] [stdout]    = help: to escape `[` and `]` characters, add '\' before them like `\[` or `\]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unresolved link to `Cursor`
[INFO] [stdout]   --> src/io/read.rs:39:20
[INFO] [stdout]    |
[INFO] [stdout] 39 |     /// create a [`Cursor`] and use [`Read::read_exact`].
[INFO] [stdout]    |                    ^^^^^^ no item named `Cursor` in scope
[INFO] [stdout]    |
[INFO] [stdout]    = help: to escape `[` and `]` characters, add '\' before them like `\[` or `\]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unresolved link to `String::from_utf8_lossy`
[INFO] [stdout]   --> src/io/macros.rs:28:34
[INFO] [stdout]    |
[INFO] [stdout] 28 | /// The string is created with [`String::from_utf8_lossy`].
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^ no item named `String` in scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `kstd`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/1.75.0-x86_64-unknown-linux-gnu/bin/rustdoc --edition=2021 --crate-type lib --crate-name kstd src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=497995d9d7ad89e4 -L dependency=/opt/rustwide/target/debug/deps --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-c699d061afa25c75.so --extern spin=/opt/rustwide/target/debug/deps/libspin-cf23d333db1942fe.rmeta --cap-lints=warn --crate-version 0.0.4` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "1a441e97e5c04bde5459aae270e1e31507a7a77ca14b68d74fb2e38e00cbbe69", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1a441e97e5c04bde5459aae270e1e31507a7a77ca14b68d74fb2e38e00cbbe69", kill_on_drop: false }`
[INFO] [stdout] 1a441e97e5c04bde5459aae270e1e31507a7a77ca14b68d74fb2e38e00cbbe69
