[INFO] fetching crate mapo 0.1.0...
[INFO] documenting mapo-0.1.0 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate mapo 0.1.0 into /workspace/builds/worker-14/source
[INFO] validating manifest of crates.io crate mapo 0.1.0 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 mapo 0.1.0
[INFO] finished tweaking crates.io crate mapo 0.1.0
[INFO] tweaked toml for crates.io crate mapo 0.1.0 written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] crate crates.io crate mapo 0.1.0 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]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded csv v1.1.4
[INFO] [stderr]   Downloaded to_precision v0.1.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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] fb0a241fa06fbe245608fff07eef9f465d227327ac3fa4e43170b20a51898550
[INFO] running `Command { std: "docker" "start" "-a" "fb0a241fa06fbe245608fff07eef9f465d227327ac3fa4e43170b20a51898550", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fb0a241fa06fbe245608fff07eef9f465d227327ac3fa4e43170b20a51898550", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fb0a241fa06fbe245608fff07eef9f465d227327ac3fa4e43170b20a51898550", kill_on_drop: false }`
[INFO] [stdout] fb0a241fa06fbe245608fff07eef9f465d227327ac3fa4e43170b20a51898550
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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] 46232a19bd7cedcfa8bfe79c7a08d12cdf855ec8ef0c4f4b600d7bbef13fd2a9
[INFO] running `Command { std: "docker" "start" "-a" "46232a19bd7cedcfa8bfe79c7a08d12cdf855ec8ef0c4f4b600d7bbef13fd2a9", kill_on_drop: false }`
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]     Checking to_precision v0.1.1
[INFO] [stderr]     Checking itertools v0.9.0
[INFO] [stderr]  Documenting mapo v0.1.0 (/opt/rustwide/workdir)
[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(generic_associated_types)]
[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 `mapo`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2021 --crate-type lib --crate-name mapo src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=528fd82145f34900 -L dependency=/opt/rustwide/target/debug/deps --extern itertools=/opt/rustwide/target/debug/deps/libitertools-31732f101c7334d9.rmeta --extern to_precision=/opt/rustwide/target/debug/deps/libto_precision-59d6f33b669873b9.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "46232a19bd7cedcfa8bfe79c7a08d12cdf855ec8ef0c4f4b600d7bbef13fd2a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "46232a19bd7cedcfa8bfe79c7a08d12cdf855ec8ef0c4f4b600d7bbef13fd2a9", kill_on_drop: false }`
[INFO] [stdout] 46232a19bd7cedcfa8bfe79c7a08d12cdf855ec8ef0c4f4b600d7bbef13fd2a9