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122 lines
3.3 KiB
Rust
122 lines
3.3 KiB
Rust
// run-pass
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// Test inclusive range syntax.
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#![allow(unused_braces)]
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#![allow(unused_comparisons)]
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use std::ops::RangeToInclusive;
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fn foo() -> isize { 42 }
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// Test that range syntax works in return statements
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pub fn return_range_to() -> RangeToInclusive<i32> { return ..=1; }
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#[derive(Debug)]
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struct P(#[allow(unused_tuple_struct_fields)] u8);
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pub fn main() {
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let mut count = 0;
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for i in 0_usize..=10 {
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assert!(i >= 0 && i <= 10);
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count += i;
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}
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assert_eq!(count, 55);
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let mut count = 0;
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let range = 0_usize..=10;
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for i in range {
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assert!(i >= 0 && i <= 10);
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count += i;
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}
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assert_eq!(count, 55);
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let mut count = 0;
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for i in (0_usize..=10).step_by(2) {
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assert!(i >= 0 && i <= 10 && i % 2 == 0);
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count += i;
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}
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assert_eq!(count, 30);
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let _ = 0_usize..=4+4-3;
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let _ = 0..=foo();
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let _ = { &42..=&100 }; // references to literals are OK
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let _ = ..=42_usize;
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// Test we can use two different types with a common supertype.
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let x = &42;
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{
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let y = 42;
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let _ = x..=&y;
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}
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// test collection indexing
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let vec = (0..=10).collect::<Vec<_>>();
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let slice: &[_] = &*vec;
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let string = String::from("hello world");
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let stir = "hello world";
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assert_eq!(&vec[3..=6], &[3, 4, 5, 6]);
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assert_eq!(&vec[ ..=6], &[0, 1, 2, 3, 4, 5, 6]);
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assert_eq!(&slice[3..=6], &[3, 4, 5, 6]);
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assert_eq!(&slice[ ..=6], &[0, 1, 2, 3, 4, 5, 6]);
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assert_eq!(&string[3..=6], "lo w");
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assert_eq!(&string[ ..=6], "hello w");
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assert_eq!(&stir[3..=6], "lo w");
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assert_eq!(&stir[ ..=6], "hello w");
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// test the size hints and emptying
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let mut long = 0..=255u8;
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let mut short = 42..=42u8;
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assert_eq!(long.size_hint(), (256, Some(256)));
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assert_eq!(short.size_hint(), (1, Some(1)));
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long.next();
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short.next();
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assert_eq!(long.size_hint(), (255, Some(255)));
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assert_eq!(short.size_hint(), (0, Some(0)));
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assert!(short.is_empty());
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assert_eq!(long.len(), 255);
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assert_eq!(short.len(), 0);
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// test iterating backwards
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assert_eq!(long.next_back(), Some(255));
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assert_eq!(long.next_back(), Some(254));
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assert_eq!(long.next_back(), Some(253));
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assert_eq!(long.next(), Some(1));
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assert_eq!(long.next(), Some(2));
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assert_eq!(long.next_back(), Some(252));
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for i in 3..=251 {
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assert_eq!(long.next(), Some(i));
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}
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assert!(long.is_empty());
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// check underflow
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let mut narrow = 1..=0;
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assert_eq!(narrow.next_back(), None);
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assert!(narrow.is_empty());
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let mut zero = 0u8..=0;
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assert_eq!(zero.next_back(), Some(0));
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assert_eq!(zero.next_back(), None);
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assert!(zero.is_empty());
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let mut high = 255u8..=255;
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assert_eq!(high.next_back(), Some(255));
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assert_eq!(high.next_back(), None);
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assert!(high.is_empty());
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// what happens if you have a nonsense range?
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let mut nonsense = 10..=5;
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assert_eq!(nonsense.next(), None);
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assert!(nonsense.is_empty());
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// output
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assert_eq!(format!("{:?}", 0..=10), "0..=10");
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assert_eq!(format!("{:?}", ..=10), "..=10");
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assert_eq!(format!("{:?}", 9..=6), "9..=6");
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// ensure that constructing a RangeInclusive does not need PartialOrd bound
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assert_eq!(format!("{:?}", P(1)..=P(2)), "P(1)..=P(2)");
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}
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