event-listener 2.3.3

# rustc version
rustc 1.47.0-nightly (6c8927b0c 2020-07-26)# docs.rs version
docsrs 0.6.0 (818e365 2020-08-06)# build log
[INFO] running `Command { std: "docker" "create" "-v" "/home/cratesfyi/workspace/builds/event-listener-2.3.3/target:/opt/rustwide/target:rw,Z" "-v" "/home/cratesfyi/workspace/builds/event-listener-2.3.3/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 -20200726-1.47.0-nightly-6c8927b0c --static-root-path / --cap-lints warn --extern-html-root-url waker_fn=https://docs.rs/waker-fn/1.0.0 --extern-html-root-url futures=https://docs.rs/futures/0.3.5" "-e" "DOCS_RS=1" "-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", kill_on_drop: false }`
[INFO] [stdout] fd88cac0a7982cbaf9f5b3c2ac4a29dceacc7c1c317f085071348a25caae6956
[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" "fd88cac0a7982cbaf9f5b3c2ac4a29dceacc7c1c317f085071348a25caae6956", kill_on_drop: false }`
[INFO] [stderr]  Documenting event-listener v2.3.3 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.97s
[INFO] running `Command { std: "docker" "inspect" "fd88cac0a7982cbaf9f5b3c2ac4a29dceacc7c1c317f085071348a25caae6956", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fd88cac0a7982cbaf9f5b3c2ac4a29dceacc7c1c317f085071348a25caae6956", kill_on_drop: false }`
[INFO] [stdout] fd88cac0a7982cbaf9f5b3c2ac4a29dceacc7c1c317f085071348a25caae6956