Cargo Features

[dependencies]
command-engine = { version = "1.0.0", default-features = false, features = ["async", "engine"] }
default = engine

The engine feature is set by default whenever command-engine is added without default-features = false somewhere in the dependency tree.

async = tokio
engine default

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.

tokio async?