[INFO] fetching crate js-object 0.2.0...
[INFO] documenting js-object-0.2.0 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate js-object 0.2.0 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate js-object 0.2.0 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate js-object 0.2.0
[INFO] finished tweaking crates.io crate js-object 0.2.0
[INFO] tweaked toml for crates.io crate js-object 0.2.0 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded js-intern v0.3.1
[INFO] [stderr]   Downloaded js-intern-proc-macro v0.3.1
[INFO] [stderr]   Downloaded js-intern-core v0.3.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] dd1be2f3af939ef30adadbcb8763cdefd62c9b112ec973b8929eb3f588307f37
[INFO] running `Command { std: "docker" "start" "-a" "dd1be2f3af939ef30adadbcb8763cdefd62c9b112ec973b8929eb3f588307f37", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dd1be2f3af939ef30adadbcb8763cdefd62c9b112ec973b8929eb3f588307f37", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dd1be2f3af939ef30adadbcb8763cdefd62c9b112ec973b8929eb3f588307f37", kill_on_drop: false }`
[INFO] [stdout] dd1be2f3af939ef30adadbcb8763cdefd62c9b112ec973b8929eb3f588307f37
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 64f40a3cd51a1b137c75bf1b7f14fa0db2999ad2c0bf4c3e75beb0ac8ef1a733
[INFO] running `Command { std: "docker" "start" "-a" "64f40a3cd51a1b137c75bf1b7f14fa0db2999ad2c0bf4c3e75beb0ac8ef1a733", kill_on_drop: false }`
[INFO] [stderr]    Compiling wasm-bindgen v0.2.75
[INFO] [stderr]     Checking js-intern-core v0.3.1
[INFO] [stderr]     Checking js-sys v0.3.52
[INFO] [stderr]    Compiling js-intern-proc-macro v0.3.1
[INFO] [stderr]     Checking js-intern v0.3.1
[INFO] [stderr]  Documenting js-object v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(specialization, proc_macro_hygiene)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[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 `js-object`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name js_object src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern js_intern=/opt/rustwide/target/debug/deps/libjs_intern-00c59b0f6d88b7dc.rmeta --extern js_sys=/opt/rustwide/target/debug/deps/libjs_sys-49dce0b94ba86ae3.rmeta --extern wasm_bindgen=/opt/rustwide/target/debug/deps/libwasm_bindgen-f39ea4f2d9dd9297.rmeta --cap-lints=warn --crate-version 0.2.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "64f40a3cd51a1b137c75bf1b7f14fa0db2999ad2c0bf4c3e75beb0ac8ef1a733", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "64f40a3cd51a1b137c75bf1b7f14fa0db2999ad2c0bf4c3e75beb0ac8ef1a733", kill_on_drop: false }`
[INFO] [stdout] 64f40a3cd51a1b137c75bf1b7f14fa0db2999ad2c0bf4c3e75beb0ac8ef1a733
