pub trait SequenceNumberConditionOption {
fn sequence_number_condition(&self) -> Option<SequenceNumberCondition>;
fn add_header(&self, builder: &mut Builder) { ... }
}
pub trait SequenceNumberConditionOption {
fn sequence_number_condition(&self) -> Option<SequenceNumberCondition>;
fn add_header(&self, builder: &mut Builder) { ... }
}