[INFO] fetching crate htmler 0.1.0...
[INFO] documenting htmler-0.1.0 against 1.69.0 for beta-1.70-rustdoc-1
[INFO] extracting crate htmler 0.1.0 into /workspace/builds/worker-7-tc1/source
[INFO] validating manifest of crates.io crate htmler 0.1.0 on toolchain 1.69.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.69.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate htmler 0.1.0
[INFO] finished tweaking crates.io crate htmler 0.1.0
[INFO] tweaked toml for crates.io crate htmler 0.1.0 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate crates.io crate htmler 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.69.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded selectors v0.24.0
[INFO] [stderr]   Downloaded servo_arc v0.2.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+1.69.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2f0424a6fba1447879c7fc80c6fecb609eb91adba2934f1e7860cf08eca52630
[INFO] running `Command { std: "docker" "start" "-a" "2f0424a6fba1447879c7fc80c6fecb609eb91adba2934f1e7860cf08eca52630", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2f0424a6fba1447879c7fc80c6fecb609eb91adba2934f1e7860cf08eca52630", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2f0424a6fba1447879c7fc80c6fecb609eb91adba2934f1e7860cf08eca52630", kill_on_drop: false }`
[INFO] [stdout] 2f0424a6fba1447879c7fc80c6fecb609eb91adba2934f1e7860cf08eca52630
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+1.69.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1ebb88717ed77a46b88946c2c38e1a23e43056660b60120155774ebbb3eb3a36
[INFO] running `Command { std: "docker" "start" "-a" "1ebb88717ed77a46b88946c2c38e1a23e43056660b60120155774ebbb3eb3a36", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.141
[INFO] [stderr]    Compiling siphasher v0.3.10
[INFO] [stderr]    Compiling proc-macro-hack v0.5.20+deprecated
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]     Checking new_debug_unreachable v1.0.4
[INFO] [stderr]    Compiling serde v1.0.160
[INFO] [stderr]     Checking mac v0.1.1
[INFO] [stderr]     Checking precomputed-hash v0.1.1
[INFO] [stderr]     Checking dtoa-short v0.3.3
[INFO] [stderr]    Compiling convert_case v0.4.0
[INFO] [stderr]     Checking nodrop v0.1.14
[INFO] [stderr]     Checking fxhash v0.2.1
[INFO] [stderr]     Checking ego-tree v0.6.2
[INFO] [stderr]     Checking futf v0.1.5
[INFO] [stderr]     Checking servo_arc v0.2.0
[INFO] [stderr]     Checking phf_shared v0.10.0
[INFO] [stderr]     Checking phf_shared v0.8.0
[INFO] [stderr]     Checking tendril v0.4.3
[INFO] [stderr]     Checking phf v0.8.0
[INFO] [stderr]    Compiling getrandom v0.2.9
[INFO] [stderr]     Checking parking_lot_core v0.9.7
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]     Checking parking_lot v0.12.1
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand_pcg v0.2.1
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling phf_generator v0.10.0
[INFO] [stderr]    Compiling phf_codegen v0.10.0
[INFO] [stderr]    Compiling string_cache_codegen v0.5.2
[INFO] [stderr]    Compiling phf_generator v0.8.0
[INFO] [stderr]    Compiling phf_codegen v0.8.0
[INFO] [stderr]    Compiling selectors v0.24.0
[INFO] [stderr]    Compiling markup5ever v0.11.0
[INFO] [stderr]     Checking string_cache v0.8.7
[INFO] [stderr]    Compiling phf_macros v0.10.0
[INFO] [stderr]    Compiling cssparser v0.29.6
[INFO] [stderr]    Compiling cssparser-macros v0.6.0
[INFO] [stderr]    Compiling html5ever v0.26.0
[INFO] [stderr]    Compiling derive_more v0.99.17
[INFO] [stderr]     Checking phf v0.10.1
[INFO] [stderr]  Documenting htmler 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:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(once_cell)]
[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 `htmler`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2021 --crate-type lib --crate-name htmler src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=c879238fba0cab5f -L dependency=/opt/rustwide/target/debug/deps --extern cssparser=/opt/rustwide/target/debug/deps/libcssparser-5f1e22f1377c8c0b.rmeta --extern ego_tree=/opt/rustwide/target/debug/deps/libego_tree-2e97e46170ed684a.rmeta --extern html5ever=/opt/rustwide/target/debug/deps/libhtml5ever-1f5b88f42b3beaa0.rmeta --extern indexmap=/opt/rustwide/target/debug/deps/libindexmap-c4694b1f37940f3c.rmeta --extern selectors=/opt/rustwide/target/debug/deps/libselectors-295f79c5dea10a34.rmeta --extern smallvec=/opt/rustwide/target/debug/deps/libsmallvec-24a86d324dae8e11.rmeta --extern tendril=/opt/rustwide/target/debug/deps/libtendril-3a8519f831d2a57a.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "1ebb88717ed77a46b88946c2c38e1a23e43056660b60120155774ebbb3eb3a36", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1ebb88717ed77a46b88946c2c38e1a23e43056660b60120155774ebbb3eb3a36", kill_on_drop: false }`
[INFO] [stdout] 1ebb88717ed77a46b88946c2c38e1a23e43056660b60120155774ebbb3eb3a36
