[INFO] fetching crate rust_interface_file_generator 0.2.5...
[INFO] documenting rust_interface_file_generator-0.2.5 against 1.75.0 for beta-1.76-rustdoc-1
[INFO] extracting crate rust_interface_file_generator 0.2.5 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate rust_interface_file_generator 0.2.5 on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate rust_interface_file_generator 0.2.5
[INFO] finished tweaking crates.io crate rust_interface_file_generator 0.2.5
[INFO] tweaked toml for crates.io crate rust_interface_file_generator 0.2.5 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "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 gen_attributes_interface_generator v0.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9e0a7c43a1e04faad50cf36039461badc26c37ed1046935fdc5bffd10d3dcfef
[INFO] running `Command { std: "docker" "start" "-a" "9e0a7c43a1e04faad50cf36039461badc26c37ed1046935fdc5bffd10d3dcfef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9e0a7c43a1e04faad50cf36039461badc26c37ed1046935fdc5bffd10d3dcfef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9e0a7c43a1e04faad50cf36039461badc26c37ed1046935fdc5bffd10d3dcfef", kill_on_drop: false }`
[INFO] [stdout] 9e0a7c43a1e04faad50cf36039461badc26c37ed1046935fdc5bffd10d3dcfef
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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" "RUSTFLAGS=--cap-lints=warn" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8e643f7d792f5322845e2f1a1d6f4b72f2fff8cdd602bdae2cb26a1da8e13c0d
[INFO] running `Command { std: "docker" "start" "-a" "8e643f7d792f5322845e2f1a1d6f4b72f2fff8cdd602bdae2cb26a1da8e13c0d", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.76
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking Inflector v0.11.4
[INFO] [stderr]     Checking quote v1.0.35
[INFO] [stderr]    Compiling derive-new v0.5.9
[INFO] [stderr]    Compiling gen_attributes_interface_generator v0.1.0
[INFO] [stderr]  Documenting rust_interface_file_generator v0.2.5 (/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(drain_filter)]
[INFO] [stdout]   |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0635]: unknown feature `drain_filter`
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(drain_filter)]
[INFO] [stdout]   |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0635.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `rust_interface_file_generator`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/1.75.0-x86_64-unknown-linux-gnu/bin/rustdoc --edition=2018 --crate-type lib --crate-name rust_interface_file_generator src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=9c459e19fcafd6a3 -L dependency=/opt/rustwide/target/debug/deps --extern inflector=/opt/rustwide/target/debug/deps/libinflector-71d4ff536a9b1dc1.rmeta --extern derive_new=/opt/rustwide/target/debug/deps/libderive_new-3e460b8accd12472.so --extern gen_attributes_interface_generator=/opt/rustwide/target/debug/deps/libgen_attributes_interface_generator-e93196b5f36287c1.so --extern syn=/opt/rustwide/target/debug/deps/libsyn-5ca59a381d9b1326.rmeta --cap-lints=warn --crate-version 0.2.5` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "8e643f7d792f5322845e2f1a1d6f4b72f2fff8cdd602bdae2cb26a1da8e13c0d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8e643f7d792f5322845e2f1a1d6f4b72f2fff8cdd602bdae2cb26a1da8e13c0d", kill_on_drop: false }`
[INFO] [stdout] 8e643f7d792f5322845e2f1a1d6f4b72f2fff8cdd602bdae2cb26a1da8e13c0d
