problem 5.2.0

# rustc version
rustc 1.40.0-nightly (fa0f7d008 2019-10-17)
# docs.rs version
docsrs 0.6.0 (e95c89b 2019-10-17)

# build log
[INFO] running `"docker" "create" "-v" "/home/cratesfyi/workspace/builds/problem-5.2.0/target:/opt/rustwide/target:rw,Z" "-v" "/home/cratesfyi/workspace/builds/problem-5.2.0/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 -20191017-1.40.0-nightly-fa0f7d008 --static-root-path / --disable-per-crate-search --extern-html-root-url backtrace=https://docs.rs/backtrace/0.3.40 --extern-html-root-url log=https://docs.rs/log/0.4.8 --extern-html-root-url loggerv=https://docs.rs/loggerv/0.7.2 --extern-html-root-url skeptic=https://docs.rs/skeptic/0.13.4" "-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] 33fa295ed2a919907b3f8fea590bd42eacaf5d1e945728d55c76be0c37045251
[INFO] running `"docker" "start" "-a" "33fa295ed2a919907b3f8fea590bd42eacaf5d1e945728d55c76be0c37045251"`
[INFO] [stderr]    Compiling libc v0.2.65
[INFO] [stderr]    Compiling cc v1.0.46
[INFO] [stderr]    Compiling proc-macro2 v1.0.5
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling serde v1.0.101
[INFO] [stderr]    Compiling version_check v0.1.5
[INFO] [stderr]    Compiling ryu v1.0.2
[INFO] [stderr]    Compiling syn v1.0.5
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling rustc-demangle v0.1.16
[INFO] [stderr]    Compiling cfg-if v0.1.10
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling itoa v0.4.4
[INFO] [stderr]    Compiling pulldown-cmark v0.2.0
[INFO] [stderr]    Compiling same-file v1.0.5
[INFO] [stderr]    Compiling remove_dir_all v0.5.2
[INFO] [stderr]    Compiling bytecount v0.4.0
[INFO] [stderr]    Compiling glob v0.2.11
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]    Compiling error-chain v0.12.1
[INFO] [stderr]    Compiling walkdir v2.2.9
[INFO] [stderr]    Compiling backtrace-sys v0.1.32
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]    Compiling tempdir v0.3.7
[INFO] [stderr]    Compiling backtrace v0.3.40
[INFO] [stderr]    Compiling serde_derive v1.0.101
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling serde_json v1.0.41
[INFO] [stderr]    Compiling cargo_metadata v0.6.4
[INFO] [stderr]    Compiling skeptic v0.13.4
[INFO] [stderr]    Compiling problem v5.2.0 (/opt/rustwide/workdir)
[INFO] [stderr]  Documenting problem v5.2.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 33.66s
[INFO] running `"docker" "inspect" "33fa295ed2a919907b3f8fea590bd42eacaf5d1e945728d55c76be0c37045251"`
[INFO] running `"docker" "rm" "-f" "33fa295ed2a919907b3f8fea590bd42eacaf5d1e945728d55c76be0c37045251"`
[INFO] [stdout] 33fa295ed2a919907b3f8fea590bd42eacaf5d1e945728d55c76be0c37045251