Cargo Features

[dependencies]
relational_types = { version = "2.0.0", default-features = false, features = ["relational_types_procmacro"] }
default = relational_types_procmacro

The relational_types_procmacro feature is set by default whenever relational_types 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.

relational_types_procmacro default