41 lines
909 B
Rust
41 lines
909 B
Rust
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fn iter_empty_and_zst() {
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for _ in Vec::<u32>::new().iter() { // this iterates over a Unique::empty()
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panic!("We should never be here.");
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}
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// Iterate over a ZST (uses arith_offset internally)
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let mut count = 0;
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for _ in &[(), (), ()] {
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count += 1;
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}
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assert_eq!(count, 3);
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}
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fn test_iterator_step_by_nth() {
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let mut it = (0..16).step_by(5);
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assert_eq!(it.nth(0), Some(0));
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assert_eq!(it.nth(0), Some(5));
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assert_eq!(it.nth(0), Some(10));
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assert_eq!(it.nth(0), Some(15));
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assert_eq!(it.nth(0), None);
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}
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fn iter_any() {
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let f = |x: &u8| { 10u8 == *x };
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f(&1u8);
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let g = |(), x: &u8| { 10u8 == *x };
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g((), &1u8);
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let h = |(), (), x: &u8| { 10u8 == *x };
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h((), (), &1u8);
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[1, 2, 3u8].into_iter().any(|elt| 10 == *elt);
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}
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fn main() {
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test_iterator_step_by_nth();
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iter_any();
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iter_empty_and_zst();
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}
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