[INFO] fetching crate stm32l4-hal 0.3.0...
[INFO] documenting stm32l4-hal-0.3.0 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate stm32l4-hal 0.3.0 into /workspace/builds/worker-13/source
[INFO] validating manifest of crates.io crate stm32l4-hal 0.3.0 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] removed /workspace/builds/worker-13/source/.cargo/config
[INFO] started tweaking crates.io crate stm32l4-hal 0.3.0
[INFO] finished tweaking crates.io crate stm32l4-hal 0.3.0
[INFO] tweaked toml for crates.io crate stm32l4-hal 0.3.0 written to /workspace/builds/worker-13/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]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded stm32l4 v0.4.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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] e85d92f88434a351b8363eabe01eb69c94970f6dbbc4e439b8337586eb9f4f06
[INFO] running `Command { std: "docker" "start" "-a" "e85d92f88434a351b8363eabe01eb69c94970f6dbbc4e439b8337586eb9f4f06", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e85d92f88434a351b8363eabe01eb69c94970f6dbbc4e439b8337586eb9f4f06", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e85d92f88434a351b8363eabe01eb69c94970f6dbbc4e439b8337586eb9f4f06", kill_on_drop: false }`
[INFO] [stdout] e85d92f88434a351b8363eabe01eb69c94970f6dbbc4e439b8337586eb9f4f06
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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] fd4002966df8ccce650944196275f82460f01974839b2008515b4f6029e76c47
[INFO] running `Command { std: "docker" "start" "-a" "fd4002966df8ccce650944196275f82460f01974839b2008515b4f6029e76c47", kill_on_drop: false }`
[INFO] [stderr]    Compiling typenum v1.15.0
[INFO] [stderr]    Compiling version_check v0.9.4
[INFO] [stderr]    Compiling cortex-m v0.7.4
[INFO] [stderr]    Compiling semver v1.0.9
[INFO] [stderr]     Checking nb v1.0.0
[INFO] [stderr]     Checking stable_deref_trait v1.2.0
[INFO] [stderr]     Checking vcell v0.1.3
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]    Compiling cortex-m v0.6.7
[INFO] [stderr]     Checking bitfield v0.13.2
[INFO] [stderr]    Compiling cortex-m v0.5.11
[INFO] [stderr]     Checking aligned v0.2.0
[INFO] [stderr]    Compiling stm32l4 v0.4.0
[INFO] [stderr]    Compiling bare-metal v0.2.5
[INFO] [stderr]     Checking nb v0.1.3
[INFO] [stderr]     Checking volatile-register v0.2.1
[INFO] [stderr]     Checking embedded-hal v0.2.7
[INFO] [stderr]    Compiling generic-array v0.14.5
[INFO] [stderr]    Compiling rustc_version v0.4.0
[INFO] [stderr]    Compiling cast v0.2.7
[INFO] [stderr]     Checking generic-array v0.13.3
[INFO] [stderr]     Checking generic-array v0.12.4
[INFO] [stderr]     Checking as-slice v0.1.5
[INFO] [stderr]     Checking aligned v0.3.5
[INFO] [stderr]  Documenting stm32l4-hal v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 14 | #![feature(unsize)]
[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 `stm32l4-hal`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name stm32l4_hal src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=f019d32246dca0d6 -L dependency=/opt/rustwide/target/debug/deps --extern cast=/opt/rustwide/target/debug/deps/libcast-b0fe4dc1d2665ece.rmeta --extern cortex_m=/opt/rustwide/target/debug/deps/libcortex_m-cc262870d931679e.rmeta --extern embedded_hal=/opt/rustwide/target/debug/deps/libembedded_hal-bdeacf1eea5f1f88.rmeta --extern nb=/opt/rustwide/target/debug/deps/libnb-767d52922bde1871.rmeta --extern stm32l4=/opt/rustwide/target/debug/deps/libstm32l4-da16e30c7890fc45.rmeta --extern void=/opt/rustwide/target/debug/deps/libvoid-84bed39d511db7f4.rmeta --cap-lints=warn --crate-version 0.3.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "fd4002966df8ccce650944196275f82460f01974839b2008515b4f6029e76c47", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fd4002966df8ccce650944196275f82460f01974839b2008515b4f6029e76c47", kill_on_drop: false }`
[INFO] [stdout] fd4002966df8ccce650944196275f82460f01974839b2008515b4f6029e76c47