[INFO] fetching crate partial-application-rs 0.1.0...
[INFO] documenting partial-application-rs-0.1.0 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate partial-application-rs 0.1.0 into /workspace/builds/worker-31/source
[INFO] validating manifest of crates.io crate partial-application-rs 0.1.0 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 partial-application-rs 0.1.0
[INFO] finished tweaking crates.io crate partial-application-rs 0.1.0
[INFO] tweaked toml for crates.io crate partial-application-rs 0.1.0 written to /workspace/builds/worker-31/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-31/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/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] ac770d501ff2988b79396e7164455ea924bdd27a084ee159cb9421df94dad197
[INFO] running `Command { std: "docker" "start" "-a" "ac770d501ff2988b79396e7164455ea924bdd27a084ee159cb9421df94dad197", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ac770d501ff2988b79396e7164455ea924bdd27a084ee159cb9421df94dad197", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ac770d501ff2988b79396e7164455ea924bdd27a084ee159cb9421df94dad197", kill_on_drop: false }`
[INFO] [stdout] ac770d501ff2988b79396e7164455ea924bdd27a084ee159cb9421df94dad197
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/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] 1a8e21d1f9f18993a755717d55914ba19b7fbc6b0161fa667ccb90acc4d7d897
[INFO] running `Command { std: "docker" "start" "-a" "1a8e21d1f9f18993a755717d55914ba19b7fbc6b0161fa667ccb90acc4d7d897", 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 partial-application-rs 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:1:12
[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 `partial-application-rs`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type proc-macro --crate-name partial_application_rs src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=ef7838d1fccf23e1 -L dependency=/opt/rustwide/target/debug/deps --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-c1d3bfa6658bd3cb.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-5e860005d80c271d.rmeta --extern syn=/opt/rustwide/target/debug/deps/libsyn-e10b46b30f50a15a.rmeta --extern proc_macro --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "1a8e21d1f9f18993a755717d55914ba19b7fbc6b0161fa667ccb90acc4d7d897", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1a8e21d1f9f18993a755717d55914ba19b7fbc6b0161fa667ccb90acc4d7d897", kill_on_drop: false }`
[INFO] [stdout] 1a8e21d1f9f18993a755717d55914ba19b7fbc6b0161fa667ccb90acc4d7d897