2 // Test inclusive range syntax.
4 #![feature(range_is_empty)]
5 #![allow(unused_comparisons)]
7 use std::ops::RangeToInclusive;
9 fn foo() -> isize { 42 }
11 // Test that range syntax works in return statements
12 pub fn return_range_to() -> RangeToInclusive<i32> { return ..=1; }
19 for i in 0_usize..=10 {
20 assert!(i >= 0 && i <= 10);
23 assert_eq!(count, 55);
26 let range = 0_usize..=10;
28 assert!(i >= 0 && i <= 10);
31 assert_eq!(count, 55);
34 for i in (0_usize..=10).step_by(2) {
35 assert!(i >= 0 && i <= 10 && i % 2 == 0);
38 assert_eq!(count, 30);
40 let _ = 0_usize..=4+4-3;
43 let _ = { &42..=&100 }; // references to literals are OK
46 // Test we can use two different types with a common supertype.
53 // test collection indexing
54 let vec = (0..=10).collect::<Vec<_>>();
55 let slice: &[_] = &*vec;
56 let string = String::from("hello world");
57 let stir = "hello world";
59 assert_eq!(&vec[3..=6], &[3, 4, 5, 6]);
60 assert_eq!(&vec[ ..=6], &[0, 1, 2, 3, 4, 5, 6]);
62 assert_eq!(&slice[3..=6], &[3, 4, 5, 6]);
63 assert_eq!(&slice[ ..=6], &[0, 1, 2, 3, 4, 5, 6]);
65 assert_eq!(&string[3..=6], "lo w");
66 assert_eq!(&string[ ..=6], "hello w");
68 assert_eq!(&stir[3..=6], "lo w");
69 assert_eq!(&stir[ ..=6], "hello w");
71 // test the size hints and emptying
72 let mut long = 0..=255u8;
73 let mut short = 42..=42u8;
74 assert_eq!(long.size_hint(), (256, Some(256)));
75 assert_eq!(short.size_hint(), (1, Some(1)));
78 assert_eq!(long.size_hint(), (255, Some(255)));
79 assert_eq!(short.size_hint(), (0, Some(0)));
80 assert!(short.is_empty());
82 assert_eq!(long.len(), 255);
83 assert_eq!(short.len(), 0);
85 // test iterating backwards
86 assert_eq!(long.next_back(), Some(255));
87 assert_eq!(long.next_back(), Some(254));
88 assert_eq!(long.next_back(), Some(253));
89 assert_eq!(long.next(), Some(1));
90 assert_eq!(long.next(), Some(2));
91 assert_eq!(long.next_back(), Some(252));
93 assert_eq!(long.next(), Some(i));
95 assert!(long.is_empty());
98 let mut narrow = 1..=0;
99 assert_eq!(narrow.next_back(), None);
100 assert!(narrow.is_empty());
101 let mut zero = 0u8..=0;
102 assert_eq!(zero.next_back(), Some(0));
103 assert_eq!(zero.next_back(), None);
104 assert!(zero.is_empty());
105 let mut high = 255u8..=255;
106 assert_eq!(high.next_back(), Some(255));
107 assert_eq!(high.next_back(), None);
108 assert!(high.is_empty());
110 // what happens if you have a nonsense range?
111 let mut nonsense = 10..=5;
112 assert_eq!(nonsense.next(), None);
113 assert!(nonsense.is_empty());
116 assert_eq!(format!("{:?}", 0..=10), "0..=10");
117 assert_eq!(format!("{:?}", ..=10), "..=10");
118 assert_eq!(format!("{:?}", 9..=6), "9..=6");
120 // ensure that constructing a RangeInclusive does not need PartialOrd bound
121 assert_eq!(format!("{:?}", P(1)..=P(2)), "P(1)..=P(2)");