Constant cargo::util::lints::IMPLICIT_FEATURES

const IMPLICIT_FEATURES: Lint;

By default, cargo will treat any optional dependency as a feature. As of cargo 1.60, these can be disabled by declaring a feature that activates the optional dependency as dep:<name> (see RFC #3143).

In the 2024 edition, cargo will stop exposing optional dependencies as features implicitly, requiring users to add foo = ["dep:foo"] if they still want it exposed.

For more information, see RFC #3491