[INFO] fetching crate command-macros-plugin 0.2.7...
[INFO] documenting command-macros-plugin-0.2.7 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate command-macros-plugin 0.2.7 into /workspace/builds/worker-61/source
[INFO] validating manifest of crates.io crate command-macros-plugin 0.2.7 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 crates.io crate command-macros-plugin 0.2.7
[INFO] finished tweaking crates.io crate command-macros-plugin 0.2.7
[INFO] tweaked toml for crates.io crate command-macros-plugin 0.2.7 written to /workspace/builds/worker-61/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "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" "+1.61.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded itertools v0.7.11
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-61/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-61/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] caed816cd979a97422f13292f02199b09eeb9658fdd7b15a82c1dbfa225809aa
[INFO] running `Command { std: "docker" "start" "-a" "caed816cd979a97422f13292f02199b09eeb9658fdd7b15a82c1dbfa225809aa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "caed816cd979a97422f13292f02199b09eeb9658fdd7b15a82c1dbfa225809aa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "caed816cd979a97422f13292f02199b09eeb9658fdd7b15a82c1dbfa225809aa", kill_on_drop: false }`
[INFO] [stdout] caed816cd979a97422f13292f02199b09eeb9658fdd7b15a82c1dbfa225809aa
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-61/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-61/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] 50060d37c650dd155f28c891b738a7258209ffc4ef7cb397a9f90f4fb37ca738
[INFO] running `Command { std: "docker" "start" "-a" "50060d37c650dd155f28c891b738a7258209ffc4ef7cb397a9f90f4fb37ca738", kill_on_drop: false }`
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]     Checking itertools v0.7.11
[INFO] [stderr]  Documenting command-macros-plugin v0.2.7 (/opt/rustwide/workdir)
[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(proc_macro_span, proc_macro_diagnostic, proc_macro_def_site)]
[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:1:29
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(proc_macro_span, proc_macro_diagnostic, proc_macro_def_site)]
[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:1:52
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(proc_macro_span, proc_macro_diagnostic, proc_macro_def_site)]
[INFO] [stdout]   |                                                    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 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 `command-macros-plugin`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type proc-macro --crate-name command_macros_plugin src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=e28401d8080193d3 -L dependency=/opt/rustwide/target/debug/deps --extern itertools=/opt/rustwide/target/debug/deps/libitertools-237e07c83799a2ab.rmeta --extern proc_macro --cap-lints=warn --crate-version 0.2.7` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "50060d37c650dd155f28c891b738a7258209ffc4ef7cb397a9f90f4fb37ca738", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "50060d37c650dd155f28c891b738a7258209ffc4ef7cb397a9f90f4fb37ca738", kill_on_drop: false }`
[INFO] [stdout] 50060d37c650dd155f28c891b738a7258209ffc4ef7cb397a9f90f4fb37ca738