Cargo Features

[dependencies]
crb-task = { version = "0.0.20", default-features = false, features = ["sync"] }
default = sync

The sync feature is set by default whenever crb-task is added without default-features = false somewhere in the dependency tree.

sync 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 sync