[INFO] fetching crate std_detect 0.1.5...
[INFO] documenting std_detect-0.1.5 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate std_detect 0.1.5 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate std_detect 0.1.5 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 std_detect 0.1.5
[INFO] finished tweaking crates.io crate std_detect 0.1.5
[INFO] tweaked toml for crates.io crate std_detect 0.1.5 written to /workspace/builds/worker-1/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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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] 53cbfec32972aa13e2334c3ed744588b8b555b31f65c15693de04e7df08cb35f
[INFO] running `Command { std: "docker" "start" "-a" "53cbfec32972aa13e2334c3ed744588b8b555b31f65c15693de04e7df08cb35f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "53cbfec32972aa13e2334c3ed744588b8b555b31f65c15693de04e7df08cb35f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "53cbfec32972aa13e2334c3ed744588b8b555b31f65c15693de04e7df08cb35f", kill_on_drop: false }`
[INFO] [stdout] 53cbfec32972aa13e2334c3ed744588b8b555b31f65c15693de04e7df08cb35f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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] 35f9aa40aa6077f77ad585b5c27bd3801b84a25f4d0aa3d4020c217fc0187692
[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" "35f9aa40aa6077f77ad585b5c27bd3801b84a25f4d0aa3d4020c217fc0187692", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Documenting std_detect v0.1.5 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:15:1
[INFO] [stdout]    |
[INFO] [stdout] 15 | #![feature(const_fn, staged_api, stdsimd, doc_cfg, allow_internal_unstable)]
[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:18:34
[INFO] [stdout]    |
[INFO] [stdout] 18 | #![cfg_attr(target_os = "linux", feature(linkage))]
[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 `std_detect`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name std_detect src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --cfg 'feature="libc"' --cfg 'feature="std_detect_dlsym_getauxval"' --cfg 'feature="std_detect_file_io"' --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern cfg_if=/opt/rustwide/target/debug/deps/libcfg_if-54290d1d4e24abd9.rmeta --extern libc=/opt/rustwide/target/debug/deps/liblibc-a529517cb7cb9f7f.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "35f9aa40aa6077f77ad585b5c27bd3801b84a25f4d0aa3d4020c217fc0187692", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "35f9aa40aa6077f77ad585b5c27bd3801b84a25f4d0aa3d4020c217fc0187692", kill_on_drop: false }`
[INFO] [stdout] 35f9aa40aa6077f77ad585b5c27bd3801b84a25f4d0aa3d4020c217fc0187692