[INFO] fetching crate drug 0.0.2...
[INFO] documenting drug-0.0.2 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate drug 0.0.2 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate drug 0.0.2 on toolchain 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate drug 0.0.2
[INFO] finished tweaking crates.io crate drug 0.0.2
[INFO] tweaked toml for crates.io crate drug 0.0.2 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f89b4d76ff1a139eaa85d9469e87dfeb289f52c51b492f4fac7ffd5b02bd11e4
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "f89b4d76ff1a139eaa85d9469e87dfeb289f52c51b492f4fac7ffd5b02bd11e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f89b4d76ff1a139eaa85d9469e87dfeb289f52c51b492f4fac7ffd5b02bd11e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f89b4d76ff1a139eaa85d9469e87dfeb289f52c51b492f4fac7ffd5b02bd11e4", kill_on_drop: false }`
[INFO] [stdout] f89b4d76ff1a139eaa85d9469e87dfeb289f52c51b492f4fac7ffd5b02bd11e4
[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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7e1fd7907a8645fd6c85a15595679ca777fc304b195d17afe810e3da94746189
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "7e1fd7907a8645fd6c85a15595679ca777fc304b195d17afe810e3da94746189", kill_on_drop: false }`
[INFO] [stderr]    Compiling ndarray v0.11.2
[INFO] [stderr]     Checking serde v1.0.115
[INFO] [stderr]     Checking num-complex v0.1.43
[INFO] [stderr]     Checking erased-serde v0.3.12
[INFO] [stderr]  Documenting drug v0.0.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:31:1
[INFO] [stdout]    |
[INFO] [stdout] 31 | #![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 2 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 `drug`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name drug 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 debug_stub_derive=/opt/rustwide/target/debug/deps/libdebug_stub_derive-6ad014b59cf521a2.so --extern erased_serde=/opt/rustwide/target/debug/deps/liberased_serde-7d4c81fb3c01ac41.rmeta --extern ndarray=/opt/rustwide/target/debug/deps/libndarray-187f438b27460675.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-d5ebcbb7c8cc870f.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-2054a0ef505987af.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-9657277a275bd2e8.so --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "7e1fd7907a8645fd6c85a15595679ca777fc304b195d17afe810e3da94746189", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7e1fd7907a8645fd6c85a15595679ca777fc304b195d17afe810e3da94746189", kill_on_drop: false }`
[INFO] [stdout] 7e1fd7907a8645fd6c85a15595679ca777fc304b195d17afe810e3da94746189