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28 lines
534 B
Rust
28 lines
534 B
Rust
trait AppendBar {
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fn append_bar(self) -> Self;
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}
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impl AppendBar for Vec<String> {
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fn append_bar(mut self) -> Self {
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// ^^^ this is important
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self.push(String::from("Bar"));
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self
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}
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}
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fn main() {
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// You can optionally experiment here.
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn is_vec_pop_eq_bar() {
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let mut foo = vec![String::from("Foo")].append_bar();
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assert_eq!(foo.pop().unwrap(), "Bar");
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assert_eq!(foo.pop().unwrap(), "Foo");
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}
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}
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