[INFO] fetching crate x86 0.34.0...
[INFO] documenting x86-0.34.0 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate x86 0.34.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate x86 0.34.0 on toolchain beta-2020-08-29
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate x86 0.34.0
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate x86 0.34.0
[INFO] tweaked toml for crates.io crate x86 0.34.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded x86test-macro v0.0.2
[INFO] [stderr]   Downloaded x86test-types v0.0.2
[INFO] [stderr]   Downloaded x86test v0.0.2
[INFO] [stderr]   Downloaded x86 v0.20.0
[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" "+beta-2020-08-29" "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] e4db167edbd245b0da6383b210ccc23946e73f6a2e75f9112fceda541876ddb8
[INFO] running `Command { std: "docker" "start" "-a" "e4db167edbd245b0da6383b210ccc23946e73f6a2e75f9112fceda541876ddb8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e4db167edbd245b0da6383b210ccc23946e73f6a2e75f9112fceda541876ddb8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e4db167edbd245b0da6383b210ccc23946e73f6a2e75f9112fceda541876ddb8", kill_on_drop: false }`
[INFO] [stdout] e4db167edbd245b0da6383b210ccc23946e73f6a2e75f9112fceda541876ddb8
[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" "+beta-2020-08-29" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] aab0eb54f6995da2fabd29603933aec90e66e679c8675863cab7c32f5b0c630a
[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" "aab0eb54f6995da2fabd29603933aec90e66e679c8675863cab7c32f5b0c630a", kill_on_drop: false }`
[INFO] [stderr]    Compiling x86 v0.34.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking bit_field v0.10.1
[INFO] [stderr]    Compiling raw-cpuid v8.1.1
[INFO] [stderr]  Documenting x86 v0.34.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(llvm_asm, core_intrinsics)]
[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 `x86`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name x86 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 bit_field=/opt/rustwide/target/debug/deps/libbit_field-a877efb72bbbf6f3.rmeta --extern bitflags=/opt/rustwide/target/debug/deps/libbitflags-e1a9b9121eac1683.rmeta --extern raw_cpuid=/opt/rustwide/target/debug/deps/libraw_cpuid-6fb4f30d1c1a5d96.rmeta --cap-lints=warn --crate-version 0.34.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "aab0eb54f6995da2fabd29603933aec90e66e679c8675863cab7c32f5b0c630a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aab0eb54f6995da2fabd29603933aec90e66e679c8675863cab7c32f5b0c630a", kill_on_drop: false }`
[INFO] [stdout] aab0eb54f6995da2fabd29603933aec90e66e679c8675863cab7c32f5b0c630a