core-error 0.0.0

# rustc version
rustc 1.40.0-nightly (f3c9cece7 2019-10-07)# docs.rs version
docsrs 0.6.0 (e17ec5c 2019-10-08)# build log
[INFO] running `"docker" "create" "-v" "/home/cratesfyi/workspace/builds/core-error-0.0.0/target:/opt/rustwide/target:rw,Z" "-v" "/home/cratesfyi/workspace/builds/core-error-0.0.0/source:/opt/rustwide/workdir:ro,Z" "-v" "/home/cratesfyi/workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/home/cratesfyi/workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1001" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "RUSTFLAGS=" "-e" "RUSTDOCFLAGS=-Z unstable-options --resource-suffix -20191007-1.40.0-nightly-f3c9cece7 --static-root-path / --disable-per-crate-search --extern-html-root-url version_check=https://docs.rs/version_check/0.9.1" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "3221225472" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+nightly" "doc" "--lib" "--no-deps" "--target" "x86_64-unknown-linux-gnu"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 44db6e151634cefc6cf560165f472407008b61d0efb5dea4769f7a77735e76de
[INFO] running `"docker" "start" "-a" "44db6e151634cefc6cf560165f472407008b61d0efb5dea4769f7a77735e76de"`
[INFO] [stderr]    Compiling version_check v0.9.1
[INFO] [stderr]    Compiling core-error v0.0.0 (/opt/rustwide/workdir)
[INFO] [stderr]  Documenting core-error v0.0.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.23s
[INFO] running `"docker" "inspect" "44db6e151634cefc6cf560165f472407008b61d0efb5dea4769f7a77735e76de"`
[INFO] running `"docker" "rm" "-f" "44db6e151634cefc6cf560165f472407008b61d0efb5dea4769f7a77735e76de"`
[INFO] [stdout] 44db6e151634cefc6cf560165f472407008b61d0efb5dea4769f7a77735e76de