steno 0.4.1

distributed saga implementation
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

//! Backports of useful unstable Rust features.

// feature(option_expect_none)
pub trait ExpectNone {
    fn expect_none(self, message: &'static str);
}

impl<T> ExpectNone for Option<T> {
    fn expect_none(self, message: &'static str) {
        assert!(self.is_none(), "{}", message);
    }
}

#[cfg(test)]
mod test {
    use super::ExpectNone;

    #[test]
    fn test_some() {
        let x: Option<()> = None;
        x.expect_none("hello");
    }

    #[test]
    #[should_panic(expected = "boom")]
    fn test_none() {
        let x = Some(());
        x.expect_none("boom");
    }
}