[INFO] fetching crate file-descriptors 0.9.1...
[INFO] documenting file-descriptors-0.9.1 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate file-descriptors 0.9.1 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate file-descriptors 0.9.1 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 file-descriptors 0.9.1
[INFO] finished tweaking crates.io crate file-descriptors 0.9.1
[INFO] tweaked toml for crates.io crate file-descriptors 0.9.1 written to /workspace/builds/worker-3/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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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] 81b5e40688bf17f14322c350bb0e608adfceec07c97f86cc9e8f7a1c24bac628
[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" "81b5e40688bf17f14322c350bb0e608adfceec07c97f86cc9e8f7a1c24bac628", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "81b5e40688bf17f14322c350bb0e608adfceec07c97f86cc9e8f7a1c24bac628", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "81b5e40688bf17f14322c350bb0e608adfceec07c97f86cc9e8f7a1c24bac628", kill_on_drop: false }`
[INFO] [stdout] 81b5e40688bf17f14322c350bb0e608adfceec07c97f86cc9e8f7a1c24bac628
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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] 09a698e395c5ab12c06a06233e977ba0da1bc14c062839319a7931d668ea5e32
[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" "09a698e395c5ab12c06a06233e977ba0da1bc14c062839319a7931d668ea5e32", kill_on_drop: false }`
[INFO] [stderr]     Checking strum v0.13.0
[INFO] [stderr]     Checking likely v0.1.0
[INFO] [stderr]     Checking errno v0.2.6
[INFO] [stderr]    Compiling strum_macros v0.13.0
[INFO] [stderr]  Documenting file-descriptors v0.9.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:10:1
[INFO] [stdout]    |
[INFO] [stdout] 10 | #![feature(core_intrinsics)]
[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:11:1
[INFO] [stdout]    |
[INFO] [stdout] 11 | #![feature(read_initializer)]
[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 `file-descriptors`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name file_descriptors 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 arrayvec=/opt/rustwide/target/debug/deps/libarrayvec-17eeaa1defb464de.rmeta --extern bitflags=/opt/rustwide/target/debug/deps/libbitflags-b7cb6f2855b37747.rmeta --extern cfg_if=/opt/rustwide/target/debug/deps/libcfg_if-54290d1d4e24abd9.rmeta --extern errno=/opt/rustwide/target/debug/deps/liberrno-af06916ea4fefea5.rmeta --extern libc=/opt/rustwide/target/debug/deps/liblibc-1ad3ad1e20beb97f.rmeta --extern likely=/opt/rustwide/target/debug/deps/liblikely-e6fed3a73798da9a.rmeta --extern memchr=/opt/rustwide/target/debug/deps/libmemchr-d54758852a71d8ed.rmeta --extern strum=/opt/rustwide/target/debug/deps/libstrum-368b31fd09999cea.rmeta --extern strum_macros=/opt/rustwide/target/debug/deps/libstrum_macros-3442dd87835a18df.so --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "09a698e395c5ab12c06a06233e977ba0da1bc14c062839319a7931d668ea5e32", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "09a698e395c5ab12c06a06233e977ba0da1bc14c062839319a7931d668ea5e32", kill_on_drop: false }`
[INFO] [stdout] 09a698e395c5ab12c06a06233e977ba0da1bc14c062839319a7931d668ea5e32