Cargo Features

[dependencies]
constant = { version = "0.2.0", default-features = false, features = ["const_internals"] }
default = const_internals

The const_internals feature is set by default whenever constant 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.

const_internals default