[INFO] fetching crate libscroll 0.2.4...
[INFO] documenting libscroll-0.2.4 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate libscroll 0.2.4 into /workspace/builds/worker-16/source
[INFO] validating manifest of crates.io crate libscroll 0.2.4 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 libscroll 0.2.4
[INFO] finished tweaking crates.io crate libscroll 0.2.4
[INFO] tweaked toml for crates.io crate libscroll 0.2.4 written to /workspace/builds/worker-16/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] [stderr]     Blocking waiting for file lock on package cache
[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 ole32-sys v0.2.0
[INFO] [stderr]   Downloaded shell32-sys v0.1.2
[INFO] [stderr]   Downloaded app_dirs v1.2.1
[INFO] [stderr]   Downloaded xdg v2.4.1
[INFO] [stderr]   Downloaded tini v0.1.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/ram-disk/builds/worker-16/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/ram-disk/builds/worker-16/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/ram-disk/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/ram-disk/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] bb69dea71141adb5f38f891050f7c608e1d7a923d24dae8b19a856ae8fe3260b
[INFO] running `Command { std: "docker" "start" "-a" "bb69dea71141adb5f38f891050f7c608e1d7a923d24dae8b19a856ae8fe3260b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bb69dea71141adb5f38f891050f7c608e1d7a923d24dae8b19a856ae8fe3260b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bb69dea71141adb5f38f891050f7c608e1d7a923d24dae8b19a856ae8fe3260b", kill_on_drop: false }`
[INFO] [stdout] bb69dea71141adb5f38f891050f7c608e1d7a923d24dae8b19a856ae8fe3260b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/ram-disk/builds/worker-16/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/ram-disk/builds/worker-16/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/ram-disk/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/ram-disk/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] 1d191642a5d588c3f4ca9ab7bf7bd7183185338b497acdb11d444fcf99ed0e2e
[INFO] running `Command { std: "docker" "start" "-a" "1d191642a5d588c3f4ca9ab7bf7bd7183185338b497acdb11d444fcf99ed0e2e", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]     Checking smallvec v1.8.0
[INFO] [stderr]     Checking roots v0.0.6
[INFO] [stderr]     Checking tini v0.1.1
[INFO] [stderr]     Checking itertools v0.8.2
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]    Compiling num-bigint v0.2.6
[INFO] [stderr]    Compiling num-rational v0.2.4
[INFO] [stderr]    Compiling num-iter v0.1.43
[INFO] [stderr]    Compiling num-complex v0.2.4
[INFO] [stderr]     Checking flo_curves v0.3.1
[INFO] [stderr]     Checking dirs-sys v0.3.7
[INFO] [stderr]     Checking dirs v4.0.0
[INFO] [stderr]     Checking xdg v2.4.1
[INFO] [stderr]     Checking app_dirs v1.2.1
[INFO] [stderr]     Checking num v0.2.1
[INFO] [stderr]  Documenting libscroll v0.2.4 (/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(map_first_last)]
[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(half_open_range_patterns)]
[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 `libscroll`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name libscroll src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=b479a23cbf32f287 -L dependency=/opt/rustwide/target/debug/deps --extern app_dirs=/opt/rustwide/target/debug/deps/libapp_dirs-08b1bf613c398f3b.rmeta --extern flo_curves=/opt/rustwide/target/debug/deps/libflo_curves-54ecd6cacfc1891f.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-1479f2b7adeaa2b6.rmeta --extern num=/opt/rustwide/target/debug/deps/libnum-354f777e9abfb263.rmeta --extern tini=/opt/rustwide/target/debug/deps/libtini-1593ac89b3cdcef5.rmeta --cap-lints=warn --crate-version 0.2.4` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "1d191642a5d588c3f4ca9ab7bf7bd7183185338b497acdb11d444fcf99ed0e2e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1d191642a5d588c3f4ca9ab7bf7bd7183185338b497acdb11d444fcf99ed0e2e", kill_on_drop: false }`
[INFO] [stdout] 1d191642a5d588c3f4ca9ab7bf7bd7183185338b497acdb11d444fcf99ed0e2e