add some tests
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@ -1351,17 +1351,18 @@ fn test_try_reserve_exact() {
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}
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#[test]
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fn test_stable_push_pop() {
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fn test_stable_pointers() {
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// Test that, if we reserved enough space, adding and removing elements does not
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// invalidate references into the vector (such as `v0`). This test also
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// runs in Miri, which would detect such problems.
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let mut v = Vec::with_capacity(10);
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let mut v = Vec::with_capacity(128);
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v.push(13);
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// laundering the lifetime -- we take care that `v` does not reallocate, so that's okay.
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// Laundering the lifetime -- we take care that `v` does not reallocate, so that's okay.
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let v0 = unsafe { &*(&v[0] as *const _) };
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// Now do a bunch of things and occasionally use `v0` again to assert it is still valid.
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// Pushing/inserting and popping/removing
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v.push(1);
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v.push(2);
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v.insert(1, 1);
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@ -1369,6 +1370,19 @@ fn test_stable_push_pop() {
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v.remove(1);
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v.pop().unwrap();
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assert_eq!(*v0, 13);
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// Extending
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v.extend(&[1, 2]); // `slice::Iter` (with `T: Copy`) specialization
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v.extend(vec![2, 3]); // `vec::IntoIter` specialization
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v.extend(std::iter::once(3)); // `TrustedLen` specialization
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v.extend(std::iter::empty::<i32>()); // `TrustedLen` specialization with empty iterator
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v.extend(std::iter::once(3).filter(|_| true)); // base case
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v.extend(std::iter::once(&3)); // `cloned` specialization
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assert_eq!(*v0, 13);
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// Truncation
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v.truncate(2);
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assert_eq!(*v0, 13);
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}
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// https://github.com/rust-lang/rust/pull/49496 introduced specialization based on:
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