[INFO] fetching crate unflappable 0.1.0...
[INFO] documenting unflappable-0.1.0 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate unflappable 0.1.0 into /workspace/builds/worker-48/source
[INFO] validating manifest of crates.io crate unflappable 0.1.0 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate unflappable 0.1.0
[INFO] finished tweaking crates.io crate unflappable 0.1.0
[INFO] tweaked toml for crates.io crate unflappable 0.1.0 written to /workspace/builds/worker-48/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "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" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-48/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-48/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c9c1e3cb4c8bdedd54b8ab7e2541e719b8f74e24b9eebb07584898764af48e0e
[INFO] running `Command { std: "docker" "start" "-a" "c9c1e3cb4c8bdedd54b8ab7e2541e719b8f74e24b9eebb07584898764af48e0e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c9c1e3cb4c8bdedd54b8ab7e2541e719b8f74e24b9eebb07584898764af48e0e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c9c1e3cb4c8bdedd54b8ab7e2541e719b8f74e24b9eebb07584898764af48e0e", kill_on_drop: false }`
[INFO] [stdout] c9c1e3cb4c8bdedd54b8ab7e2541e719b8f74e24b9eebb07584898764af48e0e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-48/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-48/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a46af28c32a2912fd487b137a4b14f3e7887a58bb411befa2e97c076454c7e46
[INFO] running `Command { std: "docker" "start" "-a" "a46af28c32a2912fd487b137a4b14f3e7887a58bb411befa2e97c076454c7e46", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking nb v1.0.0
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]     Checking nb v0.1.3
[INFO] [stderr]     Checking embedded-hal v0.2.6
[INFO] [stderr]  Documenting unflappable v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]    --> src/lib.rs:139:12
[INFO] [stdout]     |
[INFO] [stdout] 139 | #![feature(const_fn)]
[INFO] [stdout]     |            ^^^^^^^^ feature has been removed
[INFO] [stdout]     |
[INFO] [stdout]     = note: split into finer-grained feature gates
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]    --> src/lib.rs:139:1
[INFO] [stdout]     |
[INFO] [stdout] 139 | #![feature(const_fn)]
[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] Some errors have detailed explanations: E0554, E0557.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `unflappable`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name unflappable src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern embedded_hal=/opt/rustwide/target/debug/deps/libembedded_hal-b17a394102f24d4d.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "a46af28c32a2912fd487b137a4b14f3e7887a58bb411befa2e97c076454c7e46", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a46af28c32a2912fd487b137a4b14f3e7887a58bb411befa2e97c076454c7e46", kill_on_drop: false }`
[INFO] [stdout] a46af28c32a2912fd487b137a4b14f3e7887a58bb411befa2e97c076454c7e46
