[INFO] fetching crate eng-wasm 0.1.7...
[INFO] documenting eng-wasm-0.1.7 against 1.75.0 for beta-1.76-rustdoc-1
[INFO] extracting crate eng-wasm 0.1.7 into /workspace/builds/worker-5-tc1/source
[INFO] validating manifest of crates.io crate eng-wasm 0.1.7 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 eng-wasm 0.1.7
[INFO] finished tweaking crates.io crate eng-wasm 0.1.7
[INFO] tweaked toml for crates.io crate eng-wasm 0.1.7 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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded fixed-hash v0.3.2
[INFO] [stderr]   Downloaded eng-pwasm-abi v0.3.2
[INFO] [stderr]   Downloaded uint v0.6.1
[INFO] [stderr]   Downloaded static_assertions v0.2.5
[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] f7b7844cd4578d2b3cf7229012f468048a228d4bcdf7cf965ff66955a9297cfc
[INFO] running `Command { std: "docker" "start" "-a" "f7b7844cd4578d2b3cf7229012f468048a228d4bcdf7cf965ff66955a9297cfc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f7b7844cd4578d2b3cf7229012f468048a228d4bcdf7cf965ff66955a9297cfc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f7b7844cd4578d2b3cf7229012f468048a228d4bcdf7cf965ff66955a9297cfc", kill_on_drop: false }`
[INFO] [stdout] f7b7844cd4578d2b3cf7229012f468048a228d4bcdf7cf965ff66955a9297cfc
[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] ef7faba0e754d4c59102813d721e2ae5903fa247b34d5c8937fc8a468a6d8b86
[INFO] running `Command { std: "docker" "start" "-a" "ef7faba0e754d4c59102813d721e2ae5903fa247b34d5c8937fc8a468a6d8b86", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.76
[INFO] [stderr]    Compiling unicode-ident v1.0.12
[INFO] [stderr]    Compiling serde v1.0.195
[INFO] [stderr]    Compiling crunchy v0.2.2
[INFO] [stderr]    Compiling serde_json v1.0.111
[INFO] [stderr]     Checking byteorder v1.5.0
[INFO] [stderr]     Checking rustc-hex v2.1.0
[INFO] [stderr]     Checking static_assertions v0.2.5
[INFO] [stderr]     Checking itoa v1.0.10
[INFO] [stderr]     Checking ryu v1.0.16
[INFO] [stderr]     Checking fixed-hash v0.3.2
[INFO] [stderr]     Checking uint v0.6.1
[INFO] [stderr]    Compiling quote v1.0.35
[INFO] [stderr]    Compiling syn v2.0.48
[INFO] [stderr]    Compiling serde_derive v1.0.195
[INFO] [stderr]     Checking eng-pwasm-abi v0.3.2
[INFO] [stderr]  Documenting eng-wasm v0.1.7 (/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(slice_concat_trait)]
[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 `eng-wasm`
[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 --crate-type lib --crate-name eng_wasm src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=8e12f25379cdf75d -L dependency=/opt/rustwide/target/debug/deps --extern eng_pwasm_abi=/opt/rustwide/target/debug/deps/libeng_pwasm_abi-fefe6dcfff4c31c7.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-4d407a2ca149febc.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-12ddfdb970820bb3.rmeta --cap-lints=warn --crate-version 0.1.7` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "ef7faba0e754d4c59102813d721e2ae5903fa247b34d5c8937fc8a468a6d8b86", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ef7faba0e754d4c59102813d721e2ae5903fa247b34d5c8937fc8a468a6d8b86", kill_on_drop: false }`
[INFO] [stdout] ef7faba0e754d4c59102813d721e2ae5903fa247b34d5c8937fc8a468a6d8b86
