mirror of
https://github.com/rust-lang/rust
synced 2024-11-05 20:45:15 +00:00
24 lines
482 B
Rust
24 lines
482 B
Rust
//@ run-pass
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//@ compile-flags: -Zmir-opt-level=3
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trait IterExt: Iterator {
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fn fold_ex<B, F>(mut self, init: B, mut f: F) -> B
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where
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Self: Sized,
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F: FnMut(B, Self::Item) -> B,
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{
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let mut accum = init;
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while let Some(x) = self.next() {
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accum = f(accum, x);
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}
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accum
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}
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}
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impl<T: Iterator> IterExt for T {}
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fn main() {
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let test = &["\n"];
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test.iter().fold_ex(String::new(), |_, b| b.to_string());
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}
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