[INFO] fetching crate parser-c-macro 0.3.0...
[INFO] documenting parser-c-macro-0.3.0 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate parser-c-macro 0.3.0 into /workspace/builds/worker-38/source
[INFO] validating manifest of crates.io crate parser-c-macro 0.3.0 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 parser-c-macro 0.3.0
[INFO] finished tweaking crates.io crate parser-c-macro 0.3.0
[INFO] tweaked toml for crates.io crate parser-c-macro 0.3.0 written to /workspace/builds/worker-38/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-38/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-38/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] 86ff0d2ae722365c57e7cfbd14384cdd588120bcab26f9b301cc8eccc629ff5b
[INFO] running `Command { std: "docker" "start" "-a" "86ff0d2ae722365c57e7cfbd14384cdd588120bcab26f9b301cc8eccc629ff5b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "86ff0d2ae722365c57e7cfbd14384cdd588120bcab26f9b301cc8eccc629ff5b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "86ff0d2ae722365c57e7cfbd14384cdd588120bcab26f9b301cc8eccc629ff5b", kill_on_drop: false }`
[INFO] [stdout] 86ff0d2ae722365c57e7cfbd14384cdd588120bcab26f9b301cc8eccc629ff5b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-38/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-38/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] 905d45fb195e138cc783b3033c805b4e15fa89329c6575c1011d8e7ea19b3108
[INFO] running `Command { std: "docker" "start" "-a" "905d45fb195e138cc783b3033c805b4e15fa89329c6575c1011d8e7ea19b3108", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]    Compiling regex v0.2.11
[INFO] [stderr]     Checking ucd-util v0.1.8
[INFO] [stderr]     Checking quote v0.3.15
[INFO] [stderr]     Checking unicode-xid v0.0.4
[INFO] [stderr]     Checking utf8-ranges v1.0.5
[INFO] [stderr]     Checking regex-syntax v0.5.6
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]     Checking syn v0.10.8
[INFO] [stderr]     Checking aho-corasick v0.6.10
[INFO] [stderr]  Documenting parser-c-macro v0.3.0 (/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)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `proc_macro` has been stable since 1.29.0 and no longer requires an attribute to enable
[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 `parser-c-macro`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type proc-macro --crate-name parser_c_macro src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=6f9766f7496939d0 -L dependency=/opt/rustwide/target/debug/deps --extern quote=/opt/rustwide/target/debug/deps/libquote-9f002eb2506a4a4d.rmeta --extern regex=/opt/rustwide/target/debug/deps/libregex-31428ec11cfa1761.rmeta --extern syn=/opt/rustwide/target/debug/deps/libsyn-7244a5b979b8c094.rmeta --extern proc_macro --cap-lints=warn --crate-version 0.3.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "905d45fb195e138cc783b3033c805b4e15fa89329c6575c1011d8e7ea19b3108", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "905d45fb195e138cc783b3033c805b4e15fa89329c6575c1011d8e7ea19b3108", kill_on_drop: false }`
[INFO] [stdout] 905d45fb195e138cc783b3033c805b4e15fa89329c6575c1011d8e7ea19b3108