Cargo Features

rusty-leveldb = { version = "3.0.0", default-features = false, features = ["async", "fs"] }
default = fs

The fs feature is set by default whenever rusty-leveldb is added without default-features = false somewhere in the dependency tree.

async = tokio
fs default = errno, fs2

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.

errno fs

Enables errno ^0.2

fs2 fs
tokio async?