[INFO] fetching crate termrect 0.1.2...
[INFO] documenting termrect-0.1.2 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate termrect 0.1.2 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate termrect 0.1.2 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 termrect 0.1.2
[INFO] finished tweaking crates.io crate termrect 0.1.2
[INFO] tweaked toml for crates.io crate termrect 0.1.2 written to /workspace/builds/worker-8/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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded bitfield v0.13.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 692b4875e3ddae4160123a51adf007ce825cc742b7753a947a0dd4c5036abd8f
[INFO] running `Command { std: "docker" "start" "-a" "692b4875e3ddae4160123a51adf007ce825cc742b7753a947a0dd4c5036abd8f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "692b4875e3ddae4160123a51adf007ce825cc742b7753a947a0dd4c5036abd8f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "692b4875e3ddae4160123a51adf007ce825cc742b7753a947a0dd4c5036abd8f", kill_on_drop: false }`
[INFO] [stdout] 692b4875e3ddae4160123a51adf007ce825cc742b7753a947a0dd4c5036abd8f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] bfc1aa1bd334e90a0cc0cbf0c0b1a1fb6060b193a4afee8cc5d8f84cba389144
[INFO] running `Command { std: "docker" "start" "-a" "bfc1aa1bd334e90a0cc0cbf0c0b1a1fb6060b193a4afee8cc5d8f84cba389144", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]     Checking numtoa v0.1.0
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]     Checking unicode-width v0.1.9
[INFO] [stderr]     Checking bitfield v0.13.2
[INFO] [stderr]     Checking itertools v0.7.11
[INFO] [stderr]     Checking termion v1.5.6
[INFO] [stderr]  Documenting termrect v0.1.2 (/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(collections_range)]
[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 `termrect`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name termrect src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=a02ed828e8ca7702 -L dependency=/opt/rustwide/target/debug/deps --extern bitfield=/opt/rustwide/target/debug/deps/libbitfield-23a73be67494935c.rmeta --extern itertools=/opt/rustwide/target/debug/deps/libitertools-237e07c83799a2ab.rmeta --extern termion=/opt/rustwide/target/debug/deps/libtermion-ccf6d9e10480801d.rmeta --extern unicode_width=/opt/rustwide/target/debug/deps/libunicode_width-6b6dfc73d9148d18.rmeta --cap-lints=warn --crate-version 0.1.2` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "bfc1aa1bd334e90a0cc0cbf0c0b1a1fb6060b193a4afee8cc5d8f84cba389144", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bfc1aa1bd334e90a0cc0cbf0c0b1a1fb6060b193a4afee8cc5d8f84cba389144", kill_on_drop: false }`
[INFO] [stdout] bfc1aa1bd334e90a0cc0cbf0c0b1a1fb6060b193a4afee8cc5d8f84cba389144