[INFO] fetching crate extra_args 0.1.72...
[INFO] documenting extra_args-0.1.72 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate extra_args 0.1.72 into /workspace/builds/worker-13/source
[INFO] validating manifest of crates.io crate extra_args 0.1.72 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 extra_args 0.1.72
[INFO] finished tweaking crates.io crate extra_args 0.1.72
[INFO] tweaked toml for crates.io crate extra_args 0.1.72 written to /workspace/builds/worker-13/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] 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-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 2d72b608594fd9618dd2f7a38b569c47806da5e29a3474dd175b55bc9dbcf5db
[INFO] running `Command { std: "docker" "start" "-a" "2d72b608594fd9618dd2f7a38b569c47806da5e29a3474dd175b55bc9dbcf5db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2d72b608594fd9618dd2f7a38b569c47806da5e29a3474dd175b55bc9dbcf5db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2d72b608594fd9618dd2f7a38b569c47806da5e29a3474dd175b55bc9dbcf5db", kill_on_drop: false }`
[INFO] [stdout] 2d72b608594fd9618dd2f7a38b569c47806da5e29a3474dd175b55bc9dbcf5db
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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] 7806b2e0088db65d8b61cdc24fd12573613b15b2d7c97e9fa3a2d9e5e1ff8594
[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" "7806b2e0088db65d8b61cdc24fd12573613b15b2d7c97e9fa3a2d9e5e1ff8594", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.39
[INFO] [stderr]     Checking unicode-ident v1.0.0
[INFO] [stderr]    Compiling syn v1.0.95
[INFO] [stderr]     Checking quote v1.0.18
[INFO] [stderr]  Documenting extra_args v0.1.72 (/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_diagnostic)]
[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 document `extra_args`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type proc-macro --crate-name extra_args src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=031e254ec1b47403 -L dependency=/opt/rustwide/target/debug/deps --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-6d74c96db6246d9c.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-bc2ca1336e394261.rmeta --extern syn=/opt/rustwide/target/debug/deps/libsyn-498cc33faddd85f1.rmeta --extern proc_macro --cap-lints=warn --crate-version 0.1.72` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "7806b2e0088db65d8b61cdc24fd12573613b15b2d7c97e9fa3a2d9e5e1ff8594", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7806b2e0088db65d8b61cdc24fd12573613b15b2d7c97e9fa3a2d9e5e1ff8594", kill_on_drop: false }`
[INFO] [stdout] 7806b2e0088db65d8b61cdc24fd12573613b15b2d7c97e9fa3a2d9e5e1ff8594