[INFO] fetching crate rustsbi 0.2.0-alpha.4...
[INFO] documenting rustsbi-0.2.0-alpha.4 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate rustsbi 0.2.0-alpha.4 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate rustsbi 0.2.0-alpha.4 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 rustsbi 0.2.0-alpha.4
[INFO] finished tweaking crates.io crate rustsbi 0.2.0-alpha.4
[INFO] tweaked toml for crates.io crate rustsbi 0.2.0-alpha.4 written to /workspace/builds/worker-4/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] 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] 0ee7f21aa780b4e92f9eaa41efbe02cc938dfc9a9f398c45f80cbd3096eabac9
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "0ee7f21aa780b4e92f9eaa41efbe02cc938dfc9a9f398c45f80cbd3096eabac9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0ee7f21aa780b4e92f9eaa41efbe02cc938dfc9a9f398c45f80cbd3096eabac9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0ee7f21aa780b4e92f9eaa41efbe02cc938dfc9a9f398c45f80cbd3096eabac9", kill_on_drop: false }`
[INFO] [stdout] 0ee7f21aa780b4e92f9eaa41efbe02cc938dfc9a9f398c45f80cbd3096eabac9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 5e5f5b22f6c45ae01db23153523771b5fee6227221603ad76ebfa347c11deffb
[INFO] running `Command { std: "docker" "start" "-a" "5e5f5b22f6c45ae01db23153523771b5fee6227221603ad76ebfa347c11deffb", kill_on_drop: false }`
[INFO] [stderr]     Checking bit_field v0.10.1
[INFO] [stderr]     Checking spin v0.7.1
[INFO] [stderr]     Checking embedded-hal v1.0.0-alpha.4
[INFO] [stderr]    Compiling bare-metal v0.2.5
[INFO] [stderr]    Compiling riscv-target v0.1.2
[INFO] [stderr]    Compiling riscv v0.6.0
[INFO] [stderr]  Documenting rustsbi v0.2.0-alpha.4 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]    --> src/lib.rs:140:1
[INFO] [stdout]     |
[INFO] [stdout] 140 | #![feature(asm)]
[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 `rustsbi`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name rustsbi 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 embedded_hal=/opt/rustwide/target/debug/deps/libembedded_hal-0739aac0fc31f963.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-8ca6dd8a6b189380.rmeta --extern nb=/opt/rustwide/target/debug/deps/libnb-db7bfc6b24bee33a.rmeta --extern riscv=/opt/rustwide/target/debug/deps/libriscv-6d0816ae541af103.rmeta --extern spin=/opt/rustwide/target/debug/deps/libspin-f6b90a35023040bf.rmeta --cap-lints=warn --crate-version 0.2.0-alpha.4` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "5e5f5b22f6c45ae01db23153523771b5fee6227221603ad76ebfa347c11deffb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5e5f5b22f6c45ae01db23153523771b5fee6227221603ad76ebfa347c11deffb", kill_on_drop: false }`
[INFO] [stdout] 5e5f5b22f6c45ae01db23153523771b5fee6227221603ad76ebfa347c11deffb
