[INFO] fetching crate dirmod-codegen 0.2.0-alpha.1...
[INFO] documenting dirmod-codegen-0.2.0-alpha.1 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate dirmod-codegen 0.2.0-alpha.1 into /workspace/builds/worker-13/source
[INFO] validating manifest of crates.io crate dirmod-codegen 0.2.0-alpha.1 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 dirmod-codegen 0.2.0-alpha.1
[INFO] finished tweaking crates.io crate dirmod-codegen 0.2.0-alpha.1
[INFO] tweaked toml for crates.io crate dirmod-codegen 0.2.0-alpha.1 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] [stdout] 9bfae9a2e541114c70d3aa94a4b596c8c9272383786109fd68f3291401425583
[INFO] running `Command { std: "docker" "start" "-a" "9bfae9a2e541114c70d3aa94a4b596c8c9272383786109fd68f3291401425583", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9bfae9a2e541114c70d3aa94a4b596c8c9272383786109fd68f3291401425583", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9bfae9a2e541114c70d3aa94a4b596c8c9272383786109fd68f3291401425583", kill_on_drop: false }`
[INFO] [stdout] 9bfae9a2e541114c70d3aa94a4b596c8c9272383786109fd68f3291401425583
[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] 8f9bbcb10db68750547d9bcb246416cf8cd9186f43dd6f55014b9f76d0a5a4ba
[INFO] running `Command { std: "docker" "start" "-a" "8f9bbcb10db68750547d9bcb246416cf8cd9186f43dd6f55014b9f76d0a5a4ba", 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 smallvec v1.8.0
[INFO] [stderr]     Checking matches v0.1.9
[INFO] [stderr]     Checking quote v1.0.18
[INFO] [stderr]  Documenting dirmod-codegen v0.2.0-alpha.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:16:12
[INFO] [stdout]    |
[INFO] [stdout] 16 | #![feature(proc_macro_span)]
[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 `dirmod-codegen`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type proc-macro --crate-name dirmod_codegen src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=5288758a97c9db63 -L dependency=/opt/rustwide/target/debug/deps --extern matches=/opt/rustwide/target/debug/deps/libmatches-f1c4024f57379e6f.rmeta --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-c1d3bfa6658bd3cb.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-5e860005d80c271d.rmeta --extern smallvec=/opt/rustwide/target/debug/deps/libsmallvec-1d5297fdf9e8ed94.rmeta --extern syn=/opt/rustwide/target/debug/deps/libsyn-dc001e36810ebbc6.rmeta --extern proc_macro --cap-lints=warn --crate-version 0.2.0-alpha.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "8f9bbcb10db68750547d9bcb246416cf8cd9186f43dd6f55014b9f76d0a5a4ba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8f9bbcb10db68750547d9bcb246416cf8cd9186f43dd6f55014b9f76d0a5a4ba", kill_on_drop: false }`
[INFO] [stdout] 8f9bbcb10db68750547d9bcb246416cf8cd9186f43dd6f55014b9f76d0a5a4ba