[INFO] fetching crate eu 0.1.0...
[INFO] documenting eu-0.1.0 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate eu 0.1.0 into /workspace/builds/worker-83/source
[INFO] validating manifest of crates.io crate eu 0.1.0 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 eu 0.1.0
[INFO] finished tweaking crates.io crate eu 0.1.0
[INFO] tweaked toml for crates.io crate eu 0.1.0 written to /workspace/builds/worker-83/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-83/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-83/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] 2e5b8c54c2fd2f3b6f447dc70bd3050baf158cdc43200931adcffb2451f65bec
[INFO] running `Command { std: "docker" "start" "-a" "2e5b8c54c2fd2f3b6f447dc70bd3050baf158cdc43200931adcffb2451f65bec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2e5b8c54c2fd2f3b6f447dc70bd3050baf158cdc43200931adcffb2451f65bec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2e5b8c54c2fd2f3b6f447dc70bd3050baf158cdc43200931adcffb2451f65bec", kill_on_drop: false }`
[INFO] [stdout] 2e5b8c54c2fd2f3b6f447dc70bd3050baf158cdc43200931adcffb2451f65bec
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-83/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-83/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] 15a478fc9c917f9297779a02a030cf27aacee728715d5a723c8b3fe2147e8410
[INFO] running `Command { std: "docker" "start" "-a" "15a478fc9c917f9297779a02a030cf27aacee728715d5a723c8b3fe2147e8410", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking syn v1.0.74
[INFO] [stderr]  Documenting eu v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(proc_macro_diagnostic)]
[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 `eu`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type proc-macro --crate-name eu 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 proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-664abb91e2bdc317.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-dc7cbb122f009b6c.rmeta --extern syn=/opt/rustwide/target/debug/deps/libsyn-1ddc4aedb2aa3b24.rmeta --extern proc_macro --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "15a478fc9c917f9297779a02a030cf27aacee728715d5a723c8b3fe2147e8410", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "15a478fc9c917f9297779a02a030cf27aacee728715d5a723c8b3fe2147e8410", kill_on_drop: false }`
[INFO] [stdout] 15a478fc9c917f9297779a02a030cf27aacee728715d5a723c8b3fe2147e8410
