How can I make the memberwise initialiser public, by default, for structs in Swift?

Quoting the manual:

“Default Memberwise Initializers for Structure Types
The default memberwise initializer for a structure type is considered private if any of the structure’s stored properties are private. Otherwise, the initializer has an access level of internal.

As with the default initializer above, if you want a public structure type to be initializable with a memberwise initializer when used in another module, you must provide a public memberwise initializer yourself as part of the type’s definition.”

Excerpt from “The Swift Programming Language”, section “Access Control”.