[INFO] fetching crate cornflakes 0.0.7...
[INFO] documenting cornflakes-0.0.7 against 1.76.0 for beta-1.77-rustdoc-1
[INFO] extracting crate cornflakes 0.0.7 into /workspace/builds/worker-3-tc1/source
[INFO] validating manifest of crates.io crate cornflakes 0.0.7 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 cornflakes 0.0.7
[INFO] finished tweaking crates.io crate cornflakes 0.0.7
[INFO] tweaked toml for crates.io crate cornflakes 0.0.7 written to /workspace/builds/worker-3-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 cornflakes_datasize_macro v0.0.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 595530b2a4078a03c4ed2c0706f358ddbb421b376a06e05c1c159a79b99dfd24
[INFO] running `Command { std: "docker" "start" "-a" "595530b2a4078a03c4ed2c0706f358ddbb421b376a06e05c1c159a79b99dfd24", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "595530b2a4078a03c4ed2c0706f358ddbb421b376a06e05c1c159a79b99dfd24", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "595530b2a4078a03c4ed2c0706f358ddbb421b376a06e05c1c159a79b99dfd24", kill_on_drop: false }`
[INFO] [stdout] 595530b2a4078a03c4ed2c0706f358ddbb421b376a06e05c1c159a79b99dfd24
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 6cc9a26141b1c6dd5666829d017a0bbb628ed8a36075b5455b32ac1678e13fa0
[INFO] running `Command { std: "docker" "start" "-a" "6cc9a26141b1c6dd5666829d017a0bbb628ed8a36075b5455b32ac1678e13fa0", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.78
[INFO] [stderr]    Compiling num-traits v0.2.18
[INFO] [stderr]    Compiling num-rational v0.4.1
[INFO] [stderr]    Compiling num-bigint v0.4.4
[INFO] [stderr]    Compiling thiserror v1.0.57
[INFO] [stderr]    Compiling quote v1.0.35
[INFO] [stderr]    Compiling syn v2.0.48
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking num-integer v0.1.46
[INFO] [stderr]     Checking num-complex v0.4.5
[INFO] [stderr]     Checking num-iter v0.1.44
[INFO] [stderr]    Compiling thiserror-impl v1.0.57
[INFO] [stderr]     Checking num v0.4.1
[INFO] [stderr]    Compiling cornflakes_datasize_macro v0.0.1
[INFO] [stderr]  Documenting cornflakes v0.0.7 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:7:1
[INFO] [stdout]   |
[INFO] [stdout] 7 | #![feature(specialization)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 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 `cornflakes`
[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=2021 --crate-type lib --crate-name cornflakes src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=b2924fa3040768c2 -L dependency=/opt/rustwide/target/debug/deps --extern bytes=/opt/rustwide/target/debug/deps/libbytes-83cef452744526c5.rmeta --extern cornflakes_datasize_macro=/opt/rustwide/target/debug/deps/libcornflakes_datasize_macro-584ebbf050d53652.so --extern num=/opt/rustwide/target/debug/deps/libnum-7aae13f2191f8b4f.rmeta --extern thiserror=/opt/rustwide/target/debug/deps/libthiserror-b049f132ddfc695e.rmeta --cap-lints=warn --crate-version 0.0.7` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "6cc9a26141b1c6dd5666829d017a0bbb628ed8a36075b5455b32ac1678e13fa0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6cc9a26141b1c6dd5666829d017a0bbb628ed8a36075b5455b32ac1678e13fa0", kill_on_drop: false }`
[INFO] [stdout] 6cc9a26141b1c6dd5666829d017a0bbb628ed8a36075b5455b32ac1678e13fa0
