52 lines
1.3 KiB
Rust
52 lines
1.3 KiB
Rust
// compile-flags: -Zmiri-track-raw-pointers
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use std::collections::VecDeque;
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fn test_all_refs<'a, T: 'a>(dummy: &mut T, iter: impl Iterator<Item = &'a mut T>) {
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// Gather all those references.
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let mut refs: Vec<&mut T> = iter.collect();
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// Use them all. Twice, to be sure we got all interleavings.
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for r in refs.iter_mut() {
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std::mem::swap(dummy, r);
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}
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for r in refs {
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std::mem::swap(dummy, r);
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}
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}
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fn main() {
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let mut dst = VecDeque::new();
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dst.push_front(Box::new(1));
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dst.push_front(Box::new(2));
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dst.pop_back();
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let mut src = VecDeque::new();
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src.push_front(Box::new(2));
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dst.append(&mut src);
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for a in dst.iter() {
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assert_eq!(**a, 2);
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}
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// Regression test for Debug and Diaplay impl's
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println!("{:?} {:?}", dst, dst.iter());
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println!("{:?}", VecDeque::<u32>::new().iter());
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for a in dst {
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assert_eq!(*a, 2);
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}
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// # Aliasing tests.
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let mut v = std::collections::VecDeque::new();
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v.push_back(1);
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v.push_back(2);
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// Test `fold` bad aliasing.
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let mut it = v.iter_mut();
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let ref0 = it.next().unwrap();
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let sum = it.fold(0, |x, y| x + *y);
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assert_eq!(*ref0 + sum, 3);
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// Test general iterator aliasing.
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v.push_front(0);
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test_all_refs(&mut 0, v.iter_mut());
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}
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