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Auto merge of #88122 - Seppel3210:master, r=dtolnay

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Fix example in `Extend<(A, B)>` impl

After looking over the examples in my last PR (#85835) on doc.rust-lang.org/nightly I realized that the example didn't actually show what I wanted it to show 😅
So here's the better example
This commit is contained in:
bors 2021-08-22 08:03:47 +00:00
commit 80dad64775
1 changed files with 10 additions and 8 deletions
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18
library/core/src/iter/traits/collect.rs
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@ -374,16 +374,18 @@ impl<A, B, ExtendA, ExtendB> Extend<(A, B)> for (ExtendA, ExtendB)
/// # Examples
/// ```
/// let mut tuple = (vec![0], vec![1]);
/// tuple.extend(vec![(2, 3), (4, 5), (6, 7)]);
/// assert_eq!(tuple.0, vec![0, 2, 4, 6]);
/// assert_eq!(tuple.1, vec![1, 3, 5, 7]);
/// tuple.extend([(2, 3), (4, 5), (6, 7)]);
/// assert_eq!(tuple.0, [0, 2, 4, 6]);
/// assert_eq!(tuple.1, [1, 3, 5, 7]);
///
/// // also allows for arbitrarily nested tuples
/// let mut nested_tuple = (vec![(1, -1)], vec![(2, -2)]);
/// nested_tuple.extend(vec![((3, -3), (4, -4)), ((5, -5), (6, -6))]);
/// // also allows for arbitrarily nested tuples as elements
/// let mut nested_tuple = (vec![1], (vec![2], vec![3]));
/// nested_tuple.extend([(4, (5, 6)), (7, (8, 9))]);
///
/// assert_eq!(nested_tuple.0, vec![(1, -1), (3, -3), (5, -5)]);
/// assert_eq!(nested_tuple.1, vec![(2, -2), (4, -4), (6, -6)]);
/// let (a, (b, c)) = nested_tuple;
/// assert_eq!(a, [1, 4, 7]);
/// assert_eq!(b, [2, 5, 8]);
/// assert_eq!(c, [3, 6, 9]);
/// ```
fn extend<T: IntoIterator<Item = (A, B)>>(&mut self, into_iter: T) {
let (a, b) = self;