Cargo Features

unicom has no features set by default.

[dependencies]
unicom = { version = "0.2.0", features = ["futures", "rustdoc", "async-std", "tokio"] }
futures rustdoc? = futures-io
rustdoc = futures

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features. These features may have been created by mistake, and this functionality may be removed in the future.

async-std implicit feature

Enables async-std

async-std:

Async version of the Rust standard library

tokio implicit feature

Enables tokio

tokio:

An event-driven, non-blocking I/O platform for writing asynchronous I/O backed applications

futures-io futures?