Cargo Features

[dependencies]
zero_v = { version = "0.2.0", default-features = false, features = ["gen"] }
default = gen

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

gen default = zero_v_gen

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.

zero_v_gen gen