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also cover next() path of draining iterators

This commit is contained in:
Ralf Jung 2020-03-30 13:01:15 +02:00
parent 3411ade32e
commit 4eacf45c9c
1 changed files with 11 additions and 4 deletions
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15
src/liballoc/tests/vec.rs
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@ -1352,6 +1352,13 @@ fn test_try_reserve_exact() {
#[test] #[test]
fn test_stable_pointers() { fn test_stable_pointers() {
/// Pull an element from the iterator, then drop it.
/// Useful to cover both the `next` and `drop` paths of an iterator.
fn next_then_drop<I: Iterator>(mut i: I) {
i.next().unwrap();
drop(i);
}
// Test that, if we reserved enough space, adding and removing elements does not // Test that, if we reserved enough space, adding and removing elements does not
// invalidate references into the vector (such as `v0`). This test also // invalidate references into the vector (such as `v0`). This test also
// runs in Miri, which would detect such problems. // runs in Miri, which would detect such problems.
@ -1402,16 +1409,16 @@ fn test_stable_pointers() {
// Partial draining // Partial draining
v.resize_with(10, || 42); v.resize_with(10, || 42);
drop(v.drain(5..)); next_then_drop(v.drain(5..));
assert_eq!(*v0, 13); assert_eq!(*v0, 13);
// Splicing // Splicing
v.resize_with(10, || 42); v.resize_with(10, || 42);
drop(v.splice(5.., vec![1, 2, 3, 4, 5])); // empty tail after range next_then_drop(v.splice(5.., vec![1, 2, 3, 4, 5])); // empty tail after range
assert_eq!(*v0, 13); assert_eq!(*v0, 13);
drop(v.splice(5..8, vec![1])); // replacement is smaller than original range next_then_drop(v.splice(5..8, vec![1])); // replacement is smaller than original range
assert_eq!(*v0, 13); assert_eq!(*v0, 13);
drop(v.splice(5..6, vec![1; 10].into_iter().filter(|_| true))); // lower bound not exact next_then_drop(v.splice(5..6, vec![1; 10].into_iter().filter(|_| true))); // lower bound not exact
assert_eq!(*v0, 13); assert_eq!(*v0, 13);
} }