Cargo Features

[dependencies]
apool = { version = "0.1.3", default-features = false, features = ["tokio"] }
default = tokio

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

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 default

Affects sync::Mutex, sync::OwnedMutexGuard, sync::Semaphore, sync::OwnedSemaphorePermit