quit 0.2.0

Exit cleanly with an exit code
Documentation
Build #230224 2020-03-15T22:52:09.655492+00:00
# rustc version
rustc 1.43.0-nightly (7cdbc87a4 2020-03-14)
# docs.rs version
docsrs 0.6.0 (3ababaf 2020-03-14)

# build log
[INFO] running `"docker" "create" "-v" "/home/cratesfyi/workspace/builds/quit-0.2.0/target:/opt/rustwide/target:rw,Z" "-v" "/home/cratesfyi/workspace/builds/quit-0.2.0/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 -20200314-1.43.0-nightly-7cdbc87a4 --static-root-path / --extern-html-root-url lazy_static=https://docs.rs/lazy_static/1.4.0 --extern-html-root-url quit_macros=https://docs.rs/quit_macros/0.2.0" "-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"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 3d180510053c035e4c3172b18fbb03f5112078f08d9073c52ac9f4955d1185fb
[INFO] running `"docker" "start" "-a" "3d180510053c035e4c3172b18fbb03f5112078f08d9073c52ac9f4955d1185fb"`
[INFO] [stderr]    Compiling proc-macro2 v1.0.9
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling syn v1.0.16
[INFO] [stderr]    Compiling quote v1.0.3
[INFO] [stderr]    Compiling quit_macros v0.2.0
[INFO] [stderr]  Documenting quit v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 12.72s
[INFO] running `"docker" "inspect" "3d180510053c035e4c3172b18fbb03f5112078f08d9073c52ac9f4955d1185fb"`
[INFO] running `"docker" "rm" "-f" "3d180510053c035e4c3172b18fbb03f5112078f08d9073c52ac9f4955d1185fb"`
[INFO] [stdout] 3d180510053c035e4c3172b18fbb03f5112078f08d9073c52ac9f4955d1185fb