Method pop

src/speech.rs:1671–1682

(&mut self)

    }

    fn pop(&mut self) {
        const MISSING_VALUE: &str = "-- unset value --";     // can't remove a variable from context, so use this value
        let old_values = self.old_values.pop().unwrap();
        for variable in old_values.defs {
            let qname = QName::new(&variable.name);
            let old_value = match variable.value {
                None => Value::String(MISSING_VALUE.to_string()),
                Some(val) => val,
            };
            self.base.set_variable(qname, old_value);
        }
    }
}