[INFO] fetching crate dst 0.1.0...
[INFO] documenting dst-0.1.0 against 1.76.0 for beta-1.77-rustdoc-1
[INFO] extracting crate dst 0.1.0 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate dst 0.1.0 on toolchain 1.76.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.76.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate dst 0.1.0
[INFO] finished tweaking crates.io crate dst 0.1.0
[INFO] tweaked toml for crates.io crate dst 0.1.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.76.0" "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" "+1.76.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded fn-fixture-lib v1.0.2
[INFO] [stderr]   Downloaded fn-fixture v1.0.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "+1.76.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e1e70147b3e2e38716f190ae7f0328e31b4037268d08735a824a7a16248538f9
[INFO] running `Command { std: "docker" "start" "-a" "e1e70147b3e2e38716f190ae7f0328e31b4037268d08735a824a7a16248538f9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e1e70147b3e2e38716f190ae7f0328e31b4037268d08735a824a7a16248538f9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e1e70147b3e2e38716f190ae7f0328e31b4037268d08735a824a7a16248538f9", kill_on_drop: false }`
[INFO] [stdout] e1e70147b3e2e38716f190ae7f0328e31b4037268d08735a824a7a16248538f9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "+1.76.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f05ce7b1a6b35b0442840a5f2f3bf00a7c22e51be445ddd1e8c43245aae4ee73
[INFO] running `Command { std: "docker" "start" "-a" "f05ce7b1a6b35b0442840a5f2f3bf00a7c22e51be445ddd1e8c43245aae4ee73", kill_on_drop: false }`
[INFO] [stderr]  Documenting dst 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:1:50
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![cfg_attr(not(feature = "undefined_behavior"), feature(layout_for_ptr))]
[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:3:35
[INFO] [stdout]   |
[INFO] [stdout] 3 |   #![cfg_attr(feature = "unstable", feature(
[INFO] [stdout]   |  ___________________________________^
[INFO] [stdout] 4 | |     const_raw_ptr_deref,
[INFO] [stdout] 5 | |     const_mut_refs,
[INFO] [stdout] 6 | |     const_align_of_val_raw,
[INFO] [stdout] 7 | |     const_size_of_val_raw,
[INFO] [stdout] 8 | |     const_slice_from_raw_parts,
[INFO] [stdout] 9 | | ))]
[INFO] [stdout]   | |_^
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `const_raw_ptr_deref` has been stable since `1.58.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 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 `dst`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/1.76.0-x86_64-unknown-linux-gnu/bin/rustdoc --edition=2018 --crate-type lib --crate-name dst src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --cfg 'feature="unstable"' --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=9543451296084646 -L dependency=/opt/rustwide/target/debug/deps --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "f05ce7b1a6b35b0442840a5f2f3bf00a7c22e51be445ddd1e8c43245aae4ee73", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f05ce7b1a6b35b0442840a5f2f3bf00a7c22e51be445ddd1e8c43245aae4ee73", kill_on_drop: false }`
[INFO] [stdout] f05ce7b1a6b35b0442840a5f2f3bf00a7c22e51be445ddd1e8c43245aae4ee73
