undo 0.45.1

Low-level undo-redo functionality.
Documentation
Build #374500 2021-04-10T15:40:58.902324+00:00
# rustc version
rustc 1.53.0-nightly (07e0e2ec2 2021-03-24)
# docs.rs version
docsrs 0.6.0 (9708001 2021-04-08)

# build log
[INFO] running `Command { std: "docker" "create" "-v" "/home/cratesfyi/workspace/builds/undo-0.45.1/target:/opt/rustwide/target:rw,Z" "-v" "/home/cratesfyi/workspace/builds/undo-0.45.1/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" "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:abe1b87bf6b7c66130a0dd9bb19216a8db0cc381a1b41d68bf7d83b4bc040efb" "/opt/rustwide/cargo-home/bin/cargo" "+nightly" "rustdoc" "--lib" "-Zrustdoc-map" "--features" "chrono colored serde" "-Zunstable-options" "--config=doc.extern-map.registries.crates-io=\"https://docs.rs\"" "-j2" "--" "-Z" "unstable-options" "--resource-suffix" "-20210324-1.53.0-nightly-07e0e2ec2" "--static-root-path" "/" "--cap-lints" "warn" "--disable-per-crate-search", kill_on_drop: false }`
[INFO] [stdout] 7f85ffa1142f44c7ab8997fcf14d1a3442baa7fe871e3bc818b0840c13c36ac9
[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" "7f85ffa1142f44c7ab8997fcf14d1a3442baa7fe871e3bc818b0840c13c36ac9", kill_on_drop: false }`
[INFO] [stderr] /opt/crates-build-env/entrypoint.sh: line 7: /etc/hosts: Permission denied
[INFO] [stderr]    Compiling proc-macro2 v1.0.26
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling libc v0.2.93
[INFO] [stderr]    Compiling syn v1.0.69
[INFO] [stderr]    Compiling serde_derive v1.0.125
[INFO] [stderr]    Compiling serde v1.0.125
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]     Checking time v0.1.44
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking colored v2.0.0
[INFO] [stderr]     Checking arrayvec v0.7.0
[INFO] [stderr]     Checking chrono v0.4.19
[INFO] [stderr]  Documenting undo v0.45.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 24.86s
[INFO] running `Command { std: "docker" "inspect" "7f85ffa1142f44c7ab8997fcf14d1a3442baa7fe871e3bc818b0840c13c36ac9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7f85ffa1142f44c7ab8997fcf14d1a3442baa7fe871e3bc818b0840c13c36ac9", kill_on_drop: false }`
[INFO] [stdout] 7f85ffa1142f44c7ab8997fcf14d1a3442baa7fe871e3bc818b0840c13c36ac9