[INFO] fetching crate deuterium_plugin 0.5.3...
[INFO] documenting deuterium_plugin-0.5.3 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate deuterium_plugin 0.5.3 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate deuterium_plugin 0.5.3 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 deuterium_plugin 0.5.3
[INFO] finished tweaking crates.io crate deuterium_plugin 0.5.3
[INFO] tweaked toml for crates.io crate deuterium_plugin 0.5.3 written to /workspace/builds/worker-9/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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] daaee3736c380c07e05e5be098080bf5a86de78ff84a8f9eff4257e28ea43d2e
[INFO] running `Command { std: "docker" "start" "-a" "daaee3736c380c07e05e5be098080bf5a86de78ff84a8f9eff4257e28ea43d2e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "daaee3736c380c07e05e5be098080bf5a86de78ff84a8f9eff4257e28ea43d2e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "daaee3736c380c07e05e5be098080bf5a86de78ff84a8f9eff4257e28ea43d2e", kill_on_drop: false }`
[INFO] [stdout] daaee3736c380c07e05e5be098080bf5a86de78ff84a8f9eff4257e28ea43d2e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] 7a7fdf7306a7a73f3df78d47af1d691706dfd6860342bb645661d12d56f0db3f
[INFO] running `Command { std: "docker" "start" "-a" "7a7fdf7306a7a73f3df78d47af1d691706dfd6860342bb645661d12d56f0db3f", kill_on_drop: false }`
[INFO] [stderr]    Compiling regex v0.2.11
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/regex-0.2.11/src/lib.rs:522:34
[INFO] [stdout]     |
[INFO] [stdout] 522 | #![cfg_attr(feature = "pattern", feature(pattern))]
[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 compile `regex`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "7a7fdf7306a7a73f3df78d47af1d691706dfd6860342bb645661d12d56f0db3f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7a7fdf7306a7a73f3df78d47af1d691706dfd6860342bb645661d12d56f0db3f", kill_on_drop: false }`
[INFO] [stdout] 7a7fdf7306a7a73f3df78d47af1d691706dfd6860342bb645661d12d56f0db3f
