[INFO] cloning repository https://github.com/Antti/rubygems-rust-experiments
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Antti/rubygems-rust-experiments" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAntti%2Frubygems-rust-experiments", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAntti%2Frubygems-rust-experiments'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f5766bd8baf4aa90dd8e42c74b31c4af85ed32a7
[INFO] documenting Antti/rubygems-rust-experiments against 1.61.0 for beta-1.62-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAntti%2Frubygems-rust-experiments" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Antti/rubygems-rust-experiments on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Antti/rubygems-rust-experiments
[INFO] finished tweaking git repo https://github.com/Antti/rubygems-rust-experiments
[INFO] tweaked toml for git repo https://github.com/Antti/rubygems-rust-experiments written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/Antti/rubygems-rust-experiments already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4e9af1299c2ef67c4425f35caaa768894e409ff5bc5c03bed1bac462e5ee1aac
[INFO] running `Command { std: "docker" "start" "-a" "4e9af1299c2ef67c4425f35caaa768894e409ff5bc5c03bed1bac462e5ee1aac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4e9af1299c2ef67c4425f35caaa768894e409ff5bc5c03bed1bac462e5ee1aac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4e9af1299c2ef67c4425f35caaa768894e409ff5bc5c03bed1bac462e5ee1aac", kill_on_drop: false }`
[INFO] [stdout] 4e9af1299c2ef67c4425f35caaa768894e409ff5bc5c03bed1bac462e5ee1aac
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 39d274fdb02cf1528977dc91b3fd79cfe865bdc9385a9b90c93b3463b61fc013
[INFO] running `Command { std: "docker" "start" "-a" "39d274fdb02cf1528977dc91b3fd79cfe865bdc9385a9b90c93b3463b61fc013", kill_on_drop: false }`
[INFO] [stderr]  Documenting test_ruby v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around block return value
[INFO] [stdout]   --> src/macros.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 |     (x as u32 & RUBY_FLONUM_MASK == RUBY_FLONUM_FLAG)
[INFO] [stdout]    |     ^                                               ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 20 -     (x as u32 & RUBY_FLONUM_MASK == RUBY_FLONUM_FLAG)
[INFO] [stdout] 20 +     x as u32 & RUBY_FLONUM_MASK == RUBY_FLONUM_FLAG
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around block return value
[INFO] [stdout]   --> src/macros.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 25 |     ((x as u32 & (!((!0)<<RUBY_SPECIAL_SHIFT))) == RUBY_SYMBOL_FLAG)
[INFO] [stdout]    |     ^                                                              ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 25 -     ((x as u32 & (!((!0)<<RUBY_SPECIAL_SHIFT))) == RUBY_SYMBOL_FLAG)
[INFO] [stdout] 25 +     (x as u32 & (!((!0)<<RUBY_SPECIAL_SHIFT))) == RUBY_SYMBOL_FLAG
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(libc)]
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `test_ruby`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type dylib --crate-name test_rust src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=0ebabd37867493d4 -L dependency=/opt/rustwide/target/debug/deps --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "39d274fdb02cf1528977dc91b3fd79cfe865bdc9385a9b90c93b3463b61fc013", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "39d274fdb02cf1528977dc91b3fd79cfe865bdc9385a9b90c93b3463b61fc013", kill_on_drop: false }`
[INFO] [stdout] 39d274fdb02cf1528977dc91b3fd79cfe865bdc9385a9b90c93b3463b61fc013