ec7c800d2f
This commit removes pretty-expanded from all tests that wind up calling panic! one way or another now that its internals are unstable.
35 lines
960 B
Rust
35 lines
960 B
Rust
// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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trait DigitCollection: Sized {
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type Iter: Iterator<Item = u8>;
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fn digit_iter(self) -> Self::Iter;
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fn digit_sum(self) -> u32 {
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self.digit_iter()
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.map(|digit: u8| digit as u32)
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.fold(0, |sum, digit| sum + digit)
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}
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}
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impl<I> DigitCollection for I where I: Iterator<Item=u8> {
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type Iter = I;
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fn digit_iter(self) -> I {
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self
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}
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}
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fn main() {
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let xs = vec![1, 2, 3, 4, 5];
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assert_eq!(xs.into_iter().digit_sum(), 15);
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}
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