[INFO] fetching crate hexagon 0.1.2...
[INFO] documenting hexagon-0.1.2 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate hexagon 0.1.2 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate hexagon 0.1.2 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 hexagon 0.1.2
[INFO] finished tweaking crates.io crate hexagon 0.1.2
[INFO] tweaked toml for crates.io crate hexagon 0.1.2 written to /workspace/builds/worker-4/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] 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] b4f7f0ffcf867a02dc32938ab1b0b33f2248fb148c57f307c84c0c2773695819
[INFO] running `Command { std: "docker" "start" "-a" "b4f7f0ffcf867a02dc32938ab1b0b33f2248fb148c57f307c84c0c2773695819", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b4f7f0ffcf867a02dc32938ab1b0b33f2248fb148c57f307c84c0c2773695819", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b4f7f0ffcf867a02dc32938ab1b0b33f2248fb148c57f307c84c0c2773695819", kill_on_drop: false }`
[INFO] [stdout] b4f7f0ffcf867a02dc32938ab1b0b33f2248fb148c57f307c84c0c2773695819
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] d90af327d73762990a3e5bab15b4903a4601821d92cc7184a3999176bb5e56f0
[INFO] running `Command { std: "docker" "start" "-a" "d90af327d73762990a3e5bab15b4903a4601821d92cc7184a3999176bb5e56f0", kill_on_drop: false }`
[INFO] [stderr]     Checking bincode v0.9.2
[INFO] [stderr]     Checking smallvec v0.6.14
[INFO] [stderr]    Compiling serde_derive v1.0.127
[INFO] [stderr]  Documenting hexagon 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:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(nll)]
[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:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(test)]
[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 `hexagon`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name hexagon 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 bincode=/opt/rustwide/target/debug/deps/libbincode-50ad98a09ad96463.rmeta --extern byteorder=/opt/rustwide/target/debug/deps/libbyteorder-b55b8e72bfe1c077.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-5678c1422d6b64cb.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-05e319b971c8ec6f.so --extern smallvec=/opt/rustwide/target/debug/deps/libsmallvec-035473057f228748.rmeta --cap-lints=warn --crate-version 0.1.2` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "d90af327d73762990a3e5bab15b4903a4601821d92cc7184a3999176bb5e56f0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d90af327d73762990a3e5bab15b4903a4601821d92cc7184a3999176bb5e56f0", kill_on_drop: false }`
[INFO] [stdout] d90af327d73762990a3e5bab15b4903a4601821d92cc7184a3999176bb5e56f0
