18 lines
237 B
Rust
18 lines
237 B
Rust
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trait IsErr {
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fn is_err(&self, err: &str) -> bool;
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}
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impl<T> IsErr for Option<T> {
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fn is_err(&self, _err: &str) -> bool {
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true
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}
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}
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fn main() {
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let t = Some(1);
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if t.is_err("") {
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t.unwrap();
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}
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}
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