regexp 0.3.2

# rustc version
rustc 1.44.0-nightly (74bd074ee 2020-04-03)# docs.rs version
docsrs 0.6.0 (a0205ec 2020-04-03)# build log
[INFO] running `"docker" "create" "-v" "/home/cratesfyi/workspace/builds/regexp-0.3.2/target:/opt/rustwide/target:rw,Z" "-v" "/home/cratesfyi/workspace/builds/regexp-0.3.2/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 -20200403-1.44.0-nightly-74bd074ee --static-root-path / --cap-lints warn --extern-html-root-url regex=https://docs.rs/regex/1.3.6 --extern-html-root-url lazy_static=https://docs.rs/lazy_static/1.4.0" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "3221225472" "--cpus" "2" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+nightly" "doc" "--lib" "--no-deps" "-j2"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 10759d9841e00aa6cca7266a2942cd05ac424d152da9ad61111705557aefc7fd
[INFO] running `"docker" "start" "-a" "10759d9841e00aa6cca7266a2942cd05ac424d152da9ad61111705557aefc7fd"`
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking regex-syntax v0.6.17
[INFO] [stderr]     Checking thread_local v1.0.1
[INFO] [stderr]     Checking aho-corasick v0.7.8
[INFO] [stderr]     Checking regex v1.3.6
[INFO] [stderr]  Documenting regexp v0.3.2 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.97s
[INFO] running `"docker" "inspect" "10759d9841e00aa6cca7266a2942cd05ac424d152da9ad61111705557aefc7fd"`
[INFO] running `"docker" "rm" "-f" "10759d9841e00aa6cca7266a2942cd05ac424d152da9ad61111705557aefc7fd"`
[INFO] [stdout] 10759d9841e00aa6cca7266a2942cd05ac424d152da9ad61111705557aefc7fd