[INFO] fetching crate windowed-futures 0.1.0...
[INFO] documenting windowed-futures-0.1.0 against 1.75.0 for beta-1.76-rustdoc-1
[INFO] extracting crate windowed-futures 0.1.0 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate windowed-futures 0.1.0 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] started tweaking crates.io crate windowed-futures 0.1.0
[INFO] finished tweaking crates.io crate windowed-futures 0.1.0
[INFO] tweaked toml for crates.io crate windowed-futures 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" "+1.75.0" "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-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" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f8dc0a9d96cac7b6bdc47c356ef08d433d271c3fb2d06656da5922bd8f268a9a
[INFO] running `Command { std: "docker" "start" "-a" "f8dc0a9d96cac7b6bdc47c356ef08d433d271c3fb2d06656da5922bd8f268a9a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f8dc0a9d96cac7b6bdc47c356ef08d433d271c3fb2d06656da5922bd8f268a9a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f8dc0a9d96cac7b6bdc47c356ef08d433d271c3fb2d06656da5922bd8f268a9a", kill_on_drop: false }`
[INFO] [stdout] f8dc0a9d96cac7b6bdc47c356ef08d433d271c3fb2d06656da5922bd8f268a9a
[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" "+1.75.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8f74ca1ed2b0fb4f55073b4f6b8c01bdf5bab6d3f354dc622ddaae9d323fb483
[INFO] running `Command { std: "docker" "start" "-a" "8f74ca1ed2b0fb4f55073b4f6b8c01bdf5bab6d3f354dc622ddaae9d323fb483", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.76
[INFO] [stderr]     Checking futures-sink v0.3.30
[INFO] [stderr]     Checking futures-core v0.3.30
[INFO] [stderr]    Compiling slab v0.4.9
[INFO] [stderr]     Checking futures-channel v0.3.30
[INFO] [stderr]    Compiling quote v1.0.35
[INFO] [stderr]    Compiling syn v2.0.48
[INFO] [stderr]    Compiling futures-macro v0.3.30
[INFO] [stderr]     Checking futures-util v0.3.30
[INFO] [stderr]     Checking futures-executor v0.3.30
[INFO] [stderr]     Checking futures v0.3.30
[INFO] [stderr]  Documenting windowed-futures 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:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 | #![feature(noop_waker)]
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 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 `windowed-futures`
[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 windowed_futures src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=faf4ca53c63cce03 -L dependency=/opt/rustwide/target/debug/deps --extern futures=/opt/rustwide/target/debug/deps/libfutures-2f84811301b1b295.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-91e42ebaf8a62e54.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "8f74ca1ed2b0fb4f55073b4f6b8c01bdf5bab6d3f354dc622ddaae9d323fb483", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8f74ca1ed2b0fb4f55073b4f6b8c01bdf5bab6d3f354dc622ddaae9d323fb483", kill_on_drop: false }`
[INFO] [stdout] 8f74ca1ed2b0fb4f55073b4f6b8c01bdf5bab6d3f354dc622ddaae9d323fb483
