[INFO] fetching crate libvirtdma 0.1.0...
[INFO] documenting libvirtdma-0.1.0 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate libvirtdma 0.1.0 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate libvirtdma 0.1.0 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 libvirtdma 0.1.0
[INFO] finished tweaking crates.io crate libvirtdma 0.1.0
[INFO] tweaked toml for crates.io crate libvirtdma 0.1.0 written to /workspace/builds/worker-6/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-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 70d972cbbca16564b60dc543168145f36393d897530c4a2452d0c8f8c36e83d1
[INFO] running `Command { std: "docker" "start" "-a" "70d972cbbca16564b60dc543168145f36393d897530c4a2452d0c8f8c36e83d1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "70d972cbbca16564b60dc543168145f36393d897530c4a2452d0c8f8c36e83d1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "70d972cbbca16564b60dc543168145f36393d897530c4a2452d0c8f8c36e83d1", kill_on_drop: false }`
[INFO] [stdout] 70d972cbbca16564b60dc543168145f36393d897530c4a2452d0c8f8c36e83d1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] 599f533b3dfb1102f2b00c7bde1ba0502b1941c5568bd9840ee268f2f23f1fdd
[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" "599f533b3dfb1102f2b00c7bde1ba0502b1941c5568bd9840ee268f2f23f1fdd", 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] [stderr]    Compiling pelite-macros v0.1.0
[INFO] [stderr]     Checking memmem v0.1.1
[INFO] [stderr]     Checking widestring v0.4.2
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking backtrace v0.3.50
[INFO] [stderr]    Compiling iced-x86 v1.8.0
[INFO] [stderr]     Checking term-table v1.3.0
[INFO] [stderr]    Compiling c2rust-bitfields-derive v0.2.1
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]     Checking colored v1.9.3
[INFO] [stderr]     Checking pelite v0.8.1
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]     Checking c2rust-bitfields v0.3.0
[INFO] [stderr]     Checking proc-maps v0.1.6
[INFO] [stderr]  Documenting libvirtdma v0.1.0 (/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(const_int_pow)]
[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:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(new_uninit)]
[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 `libvirtdma`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name libvirtdma 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 byteorder=/opt/rustwide/target/debug/deps/libbyteorder-cdbbc07100f440a1.rmeta --extern c2rust_bitfields=/opt/rustwide/target/debug/deps/libc2rust_bitfields-b4e11de8d5d20482.rmeta --extern colored=/opt/rustwide/target/debug/deps/libcolored-8369f02ffbeae4d8.rmeta --extern iced_x86=/opt/rustwide/target/debug/deps/libiced_x86-f7d098585a38663a.rmeta --extern itertools=/opt/rustwide/target/debug/deps/libitertools-0c18a9a7e3816bae.rmeta --extern libc=/opt/rustwide/target/debug/deps/liblibc-4282d97f04dc73a8.rmeta --extern memmem=/opt/rustwide/target/debug/deps/libmemmem-f24064a1901a1167.rmeta --extern nix=/opt/rustwide/target/debug/deps/libnix-2200f0c2219320b4.rmeta --extern pelite=/opt/rustwide/target/debug/deps/libpelite-1a9615ca635dd9c7.rmeta --extern proc_maps=/opt/rustwide/target/debug/deps/libproc_maps-86f2d989784484d7.rmeta --extern regex=/opt/rustwide/target/debug/deps/libregex-5103ea9f59ed634c.rmeta --extern static_assertions=/opt/rustwide/target/debug/deps/libstatic_assertions-c6fada7e75b57fb2.rmeta --extern term_table=/opt/rustwide/target/debug/deps/libterm_table-70f33cb70ee149f6.rmeta --extern widestring=/opt/rustwide/target/debug/deps/libwidestring-776dbb8842a01c24.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "599f533b3dfb1102f2b00c7bde1ba0502b1941c5568bd9840ee268f2f23f1fdd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "599f533b3dfb1102f2b00c7bde1ba0502b1941c5568bd9840ee268f2f23f1fdd", kill_on_drop: false }`
[INFO] [stdout] 599f533b3dfb1102f2b00c7bde1ba0502b1941c5568bd9840ee268f2f23f1fdd