Cargo Features

[dependencies]
random-access-disk = { version = "3.0.1", default-features = false, features = ["sparse", "async-std", "tokio"] }
default = async-std, sparse

These default features are set whenever random-access-disk is added without default-features = false somewhere in the dependency tree.

sparse default = libc

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 default
tokio implicit feature

Enables tokio

tokio:

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

libc sparse