1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
#![allow(clippy::uninlined_format_args)]
use syn::punctuated::{Pair, Punctuated};
use syn::Token;
#[macro_use]
mod macros;
macro_rules! check_exact_size_iterator {
($iter:expr) => {{
let iter = $iter;
let size_hint = iter.size_hint();
let len = iter.len();
let count = iter.count();
assert_eq!(len, count);
assert_eq!(size_hint, (count, Some(count)));
}};
}
#[test]
fn pairs() {
let mut p: Punctuated<_, Token![,]> = punctuated!(2, 3, 4);
check_exact_size_iterator!(p.pairs());
check_exact_size_iterator!(p.pairs_mut());
check_exact_size_iterator!(p.into_pairs());
let mut p: Punctuated<_, Token![,]> = punctuated!(2, 3, 4);
assert_eq!(p.pairs().next_back().map(Pair::into_value), Some(&4));
assert_eq!(
p.pairs_mut().next_back().map(Pair::into_value),
Some(&mut 4)
);
assert_eq!(p.into_pairs().next_back().map(Pair::into_value), Some(4));
}
#[test]
fn iter() {
let mut p: Punctuated<_, Token![,]> = punctuated!(2, 3, 4);
check_exact_size_iterator!(p.iter());
check_exact_size_iterator!(p.iter_mut());
check_exact_size_iterator!(p.into_iter());
let mut p: Punctuated<_, Token![,]> = punctuated!(2, 3, 4);
assert_eq!(p.iter().next_back(), Some(&4));
assert_eq!(p.iter_mut().next_back(), Some(&mut 4));
assert_eq!(p.into_iter().next_back(), Some(4));
}
#[test]
fn may_dangle() {
let p: Punctuated<_, Token![,]> = punctuated!(2, 3, 4);
for element in &p {
if *element == 2 {
drop(p);
break;
}
}
let mut p: Punctuated<_, Token![,]> = punctuated!(2, 3, 4);
for element in &mut p {
if *element == 2 {
drop(p);
break;
}
}
}
|
