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Rollup merge of #109337 - frengor:collect_into_doc, r=scottmcm

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Improve `Iterator::collect_into` documentation

This improves the examples in the documentation of `Iterator::collect_into`, replacing the usages of `println!` with `assert_eq!` as suggested on [IRLO](https://internals.rust-lang.org/t/18534/9).
This commit is contained in:
Matthias Krüger 2023-03-20 07:10:33 +01:00 committed by GitHub
commit fb4f015ea3
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1 changed files with 4 additions and 4 deletions
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8
library/core/src/iter/traits/iterator.rs
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@ -2003,7 +2003,7 @@ pub trait Iterator {
/// a.iter().map(|&x| x * 2).collect_into(&mut vec);
/// a.iter().map(|&x| x * 10).collect_into(&mut vec);
///
/// assert_eq!(vec![0, 1, 2, 4, 6, 10, 20, 30], vec);
/// assert_eq!(vec, vec![0, 1, 2, 4, 6, 10, 20, 30]);
/// ```
///
/// `Vec` can have a manual set capacity to avoid reallocating it:
@ -2018,7 +2018,7 @@ pub trait Iterator {
/// a.iter().map(|&x| x * 10).collect_into(&mut vec);
///
/// assert_eq!(6, vec.capacity());
/// println!("{:?}", vec);
/// assert_eq!(vec, vec![2, 4, 6, 10, 20, 30]);
/// ```
///
/// The returned mutable reference can be used to continue the call chain:
@ -2032,12 +2032,12 @@ pub trait Iterator {
/// let count = a.iter().collect_into(&mut vec).iter().count();
///
/// assert_eq!(count, vec.len());
/// println!("Vec len is {}", count);
/// assert_eq!(vec, vec![1, 2, 3]);
///
/// let count = a.iter().collect_into(&mut vec).iter().count();
///
/// assert_eq!(count, vec.len());
/// println!("Vec len now is {}", count);
/// assert_eq!(vec, vec![1, 2, 3, 1, 2, 3]);
/// ```
#[inline]
#[unstable(feature = "iter_collect_into", reason = "new API", issue = "94780")]