[INFO] fetching crate incinerator 0.0.1...
[INFO] documenting incinerator-0.0.1 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate incinerator 0.0.1 into /workspace/builds/worker-13/source
[INFO] validating manifest of crates.io crate incinerator 0.0.1 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 incinerator 0.0.1
[INFO] finished tweaking crates.io crate incinerator 0.0.1
[INFO] tweaked toml for crates.io crate incinerator 0.0.1 written to /workspace/builds/worker-13/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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "fetch" "--locked" "--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-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" "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] 4b0acde92cd3ed189d655b34bdf76d53ae73a6af4a09f323d336d547ed484365
[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" "4b0acde92cd3ed189d655b34bdf76d53ae73a6af4a09f323d336d547ed484365", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4b0acde92cd3ed189d655b34bdf76d53ae73a6af4a09f323d336d547ed484365", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4b0acde92cd3ed189d655b34bdf76d53ae73a6af4a09f323d336d547ed484365", kill_on_drop: false }`
[INFO] [stdout] 4b0acde92cd3ed189d655b34bdf76d53ae73a6af4a09f323d336d547ed484365
[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" "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] c8768a2b92ce1c176fa610d952c1759dfcb02adb729a463ce328960908823976
[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" "c8768a2b92ce1c176fa610d952c1759dfcb02adb729a463ce328960908823976", kill_on_drop: false }`
[INFO] [stderr]     Checking nested v0.1.1
[INFO] [stderr]    Compiling atomic_enum v0.1.1
[INFO] [stderr]  Documenting incinerator v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | / #![feature(
[INFO] [stdout] 2 | |     alloc_layout_extra,
[INFO] [stdout] 3 | |     cell_update,
[INFO] [stdout] 4 | |     raw,
[INFO] [stdout] 5 | |     maybe_uninit_ref,
[INFO] [stdout] 6 | |     maybe_uninit_extra
[INFO] [stdout] 7 | | )]
[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 `incinerator`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name incinerator 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 atomic_enum=/opt/rustwide/target/debug/deps/libatomic_enum-40f210e3b410388e.so --extern nested=/opt/rustwide/target/debug/deps/libnested-7910dc88d5ef0639.rmeta --extern once_cell=/opt/rustwide/target/debug/deps/libonce_cell-8810c110b9f3557a.rmeta --extern parking_lot=/opt/rustwide/target/debug/deps/libparking_lot-4c7ac7cd4b452da0.rmeta --extern thread_local=/opt/rustwide/target/debug/deps/libthread_local-cf52d209cc980577.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "c8768a2b92ce1c176fa610d952c1759dfcb02adb729a463ce328960908823976", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c8768a2b92ce1c176fa610d952c1759dfcb02adb729a463ce328960908823976", kill_on_drop: false }`
[INFO] [stdout] c8768a2b92ce1c176fa610d952c1759dfcb02adb729a463ce328960908823976