Cargo Features

[dependencies]
unlock = { version = "0.0.13", default-features = false, features = ["trace", "parking_lot", "serde"] }
default = parking_lot, serde

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

trace

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.

parking_lot default
serde default