[INFO] fetching crate simple_calculator_cmd 0.1.1...
[INFO] documenting simple_calculator_cmd-0.1.1 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate simple_calculator_cmd 0.1.1 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate simple_calculator_cmd 0.1.1 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 simple_calculator_cmd 0.1.1
[INFO] finished tweaking crates.io crate simple_calculator_cmd 0.1.1
[INFO] tweaked toml for crates.io crate simple_calculator_cmd 0.1.1 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate crates.io crate simple_calculator_cmd 0.1.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded simple_calculator_deliver v0.1.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] 6e0fd07ff63375bc79b4c63ee99fd386d5bc01dc1f82e6e175d2d33a30a21eef
[INFO] running `Command { std: "docker" "start" "-a" "6e0fd07ff63375bc79b4c63ee99fd386d5bc01dc1f82e6e175d2d33a30a21eef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6e0fd07ff63375bc79b4c63ee99fd386d5bc01dc1f82e6e175d2d33a30a21eef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6e0fd07ff63375bc79b4c63ee99fd386d5bc01dc1f82e6e175d2d33a30a21eef", kill_on_drop: false }`
[INFO] [stdout] 6e0fd07ff63375bc79b4c63ee99fd386d5bc01dc1f82e6e175d2d33a30a21eef
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] 295ffd77d0fb375f0398a433af13b2919c99cf0d878bbb324f9c1ca49c2e34a4
[INFO] running `Command { std: "docker" "start" "-a" "295ffd77d0fb375f0398a433af13b2919c99cf0d878bbb324f9c1ca49c2e34a4", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.29
[INFO] [stderr]    Compiling syn v1.0.76
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling simple_calculator_deliver v0.1.1
[INFO] [stderr]  Documenting simple_calculator_cmd v0.1.1 (/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(exclusive_range_pattern)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(bool_to_option)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 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 `simple_calculator_cmd`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2021 --crate-type lib --crate-name simple_calculator_cmd src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=8611f196761c789b -L dependency=/opt/rustwide/target/debug/deps --extern simple_calculator_deliver=/opt/rustwide/target/debug/deps/libsimple_calculator_deliver-81a9e95bbfc14097.so --cap-lints=warn --crate-version 0.1.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "295ffd77d0fb375f0398a433af13b2919c99cf0d878bbb324f9c1ca49c2e34a4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "295ffd77d0fb375f0398a433af13b2919c99cf0d878bbb324f9c1ca49c2e34a4", kill_on_drop: false }`
[INFO] [stdout] 295ffd77d0fb375f0398a433af13b2919c99cf0d878bbb324f9c1ca49c2e34a4