also cover next() path of draining iterators
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@ -1352,6 +1352,13 @@ fn test_try_reserve_exact() {
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#[test]
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fn test_stable_pointers() {
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/// Pull an element from the iterator, then drop it.
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/// Useful to cover both the `next` and `drop` paths of an iterator.
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fn next_then_drop<I: Iterator>(mut i: I) {
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i.next().unwrap();
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drop(i);
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}
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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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@ -1402,16 +1409,16 @@ fn test_stable_pointers() {
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// Partial draining
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v.resize_with(10, || 42);
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drop(v.drain(5..));
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next_then_drop(v.drain(5..));
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assert_eq!(*v0, 13);
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// Splicing
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v.resize_with(10, || 42);
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drop(v.splice(5.., vec![1, 2, 3, 4, 5])); // empty tail after range
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next_then_drop(v.splice(5.., vec![1, 2, 3, 4, 5])); // empty tail after range
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assert_eq!(*v0, 13);
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drop(v.splice(5..8, vec![1])); // replacement is smaller than original range
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next_then_drop(v.splice(5..8, vec![1])); // replacement is smaller than original range
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assert_eq!(*v0, 13);
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drop(v.splice(5..6, vec![1; 10].into_iter().filter(|_| true))); // lower bound not exact
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next_then_drop(v.splice(5..6, vec![1; 10].into_iter().filter(|_| true))); // lower bound not exact
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assert_eq!(*v0, 13);
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}
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