pub trait IndexingDirectiveOption {
// Required method
fn indexing_directive(&self) -> IndexingDirective;
// Provided method
fn add_header(&self, builder: Builder) -> Builder { ... }
}
pub trait IndexingDirectiveOption {
// Required method
fn indexing_directive(&self) -> IndexingDirective;
// Provided method
fn add_header(&self, builder: Builder) -> Builder { ... }
}