Cargo Features

[dependencies]
aba-cache = { version = "0.1.1", default-features = false, features = ["asynchronous"] }
default = asynchronous

The asynchronous feature is set by default whenever aba-cache is added without default-features = false somewhere in the dependency tree.

asynchronous default = tokio

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 asynchronous

Enables tokio ^0.2