pub trait StatFieldProvider {
// Required method
fn visit_stat_fields(&self, visitor: &mut dyn FnMut(ExportedStat));
// Provided method
fn stat_fields(&self) -> Vec<ExportedStat> { ... }
}pub trait StatFieldProvider {
// Required method
fn visit_stat_fields(&self, visitor: &mut dyn FnMut(ExportedStat));
// Provided method
fn stat_fields(&self) -> Vec<ExportedStat> { ... }
}