potential 2.2.1

# rustc version
rustc 1.48.0-nightly (bbc677480 2020-09-18)
# docs.rs version
docsrs 0.6.0 (8fecbb4 2020-09-15)

# build log
[INFO] running `Command { std: "docker" "create" "-v" "/home/cratesfyi/workspace/builds/potential-2.2.1/target:/opt/rustwide/target:rw,Z" "-v" "/home/cratesfyi/workspace/builds/potential-2.2.1/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "DOCS_RS=1" "-e" "RUSTFLAGS=" "-e" "RUSTDOCFLAGS=-Z unstable-options --static-root-path / --cap-lints warn --disable-per-crate-search --extern-html-root-url futures_util=https://docs.rs/futures-util/0.3.5 --extern-html-root-url log=https://docs.rs/log/0.4.11 --extern-html-root-url futures_channel=https://docs.rs/futures-channel/0.3.5 --resource-suffix -20200918-1.48.0-nightly-bbc677480" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "3221225472" "--cpus" "2" "--user" "1001:1001" "--network" "none" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+nightly" "doc" "--lib" "--no-deps" "-j2", kill_on_drop: false }`
[INFO] [stdout] 69c1c6483babfe934d95774c843284fbbc88c35b65797a2c57b3949e46ca3f8c
[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" "69c1c6483babfe934d95774c843284fbbc88c35b65797a2c57b3949e46ca3f8c", kill_on_drop: false }`
[INFO] [stderr] /opt/crates-build-env/entrypoint.sh: line 7: /etc/hosts: Permission denied
[INFO] [stderr]    Compiling proc-macro2 v1.0.21
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.41
[INFO] [stderr]    Compiling pin-project-internal v0.4.23
[INFO] [stderr]     Checking futures-core v0.3.5
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]     Checking once_cell v1.4.1
[INFO] [stderr]     Checking slab v0.4.2
[INFO] [stderr]     Checking pin-utils v0.1.0
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]     Checking futures-channel v0.3.5
[INFO] [stderr]     Checking futures-task v0.3.5
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]     Checking pin-project v0.4.23
[INFO] [stderr]     Checking futures-util v0.3.5
[INFO] [stderr]  Documenting potential v2.2.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 20.14s
[INFO] running `Command { std: "docker" "inspect" "69c1c6483babfe934d95774c843284fbbc88c35b65797a2c57b3949e46ca3f8c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "69c1c6483babfe934d95774c843284fbbc88c35b65797a2c57b3949e46ca3f8c", kill_on_drop: false }`
[INFO] [stdout] 69c1c6483babfe934d95774c843284fbbc88c35b65797a2c57b3949e46ca3f8c