[INFO] fetching crate cargo_meta_proc 0.1.4...
[INFO] documenting cargo_meta_proc-0.1.4 against beta-2021-08-01 for beta-1.55-rustdoc-1
[INFO] extracting crate cargo_meta_proc 0.1.4 into /workspace/builds/worker-23/source
[INFO] validating manifest of crates.io crate cargo_meta_proc 0.1.4 on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate cargo_meta_proc 0.1.4
[INFO] finished tweaking crates.io crate cargo_meta_proc 0.1.4
[INFO] tweaked toml for crates.io crate cargo_meta_proc 0.1.4 written to /workspace/builds/worker-23/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "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" "+beta-2021-08-01" "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 syn v0.15.44
[INFO] [stderr]   Downloaded serde v1.0.127
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-23/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-23/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" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3f9877d2b1d878ab1d896cb161e1020b18ac2234056ac9d63918a7b66681c9cf
[INFO] running `Command { std: "docker" "start" "-a" "3f9877d2b1d878ab1d896cb161e1020b18ac2234056ac9d63918a7b66681c9cf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3f9877d2b1d878ab1d896cb161e1020b18ac2234056ac9d63918a7b66681c9cf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3f9877d2b1d878ab1d896cb161e1020b18ac2234056ac9d63918a7b66681c9cf", kill_on_drop: false }`
[INFO] [stdout] 3f9877d2b1d878ab1d896cb161e1020b18ac2234056ac9d63918a7b66681c9cf
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-23/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-23/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" "+beta-2021-08-01" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6c5b553e0a8b0d927541f0324930a47c395852b682b021ded268b0d5fabd4885
[INFO] running `Command { std: "docker" "start" "-a" "6c5b553e0a8b0d927541f0324930a47c395852b682b021ded268b0d5fabd4885", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking unicode-xid v0.1.0
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]     Checking toml v0.5.8
[INFO] [stderr]     Checking quote v0.6.13
[INFO] [stderr]  Documenting cargo_meta_proc v0.1.4 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta 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 `cargo_meta_proc`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type proc-macro --crate-name cargo_meta_proc 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_macro2-6b84acfebdb9699a.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-42363d9a73e878bb.rmeta --extern syn=/opt/rustwide/target/debug/deps/libsyn-d562f611745232dd.rmeta --extern toml=/opt/rustwide/target/debug/deps/libtoml-9252ccb80ede1acc.rmeta --extern proc_macro --cap-lints=warn --crate-version 0.1.4` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "6c5b553e0a8b0d927541f0324930a47c395852b682b021ded268b0d5fabd4885", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6c5b553e0a8b0d927541f0324930a47c395852b682b021ded268b0d5fabd4885", kill_on_drop: false }`
[INFO] [stdout] 6c5b553e0a8b0d927541f0324930a47c395852b682b021ded268b0d5fabd4885
