pub trait ToSql {
// Required method
fn write_sql(&self, buf: &mut String, dialect: Dialect);
// Provided method
fn to_sql(&self, dialect: Dialect) -> String { ... }
}
pub trait ToSql {
// Required method
fn write_sql(&self, buf: &mut String, dialect: Dialect);
// Provided method
fn to_sql(&self, dialect: Dialect) -> String { ... }
}