Method sub_op

crates/gitql-core/src/values/interval.rs:105–111

(&self, other: &Box<dyn Value>)

    }

    fn sub_op(&self, other: &Box<dyn Value>) -> Result<Box<dyn Value>, String> {
        if let Some(other_interval) = other.as_any().downcast_ref::<IntervalValue>() {
            let interval = self.interval.sub(&other_interval.interval)?;
            return Ok(Box::new(IntervalValue::new(interval)));
        }
        Err("Unexpected type to perform `-` with".to_string())
    }

    fn mul_op(&self, other: &Box<dyn Value>) -> Result<Box<dyn Value>, String> {
        if let Some(value) = other.as_int() {