UI to unit test for those using Cell/RefCell/UnsafeCell

library/core/tests/slice.rs

@@ -1980,3 +1980,32 @@ fn test_is_sorted() {
  assert!(!["c", "bb", "aaa"].is_sorted());
  assert!(["c", "bb", "aaa"].is_sorted_by_key(|s| s.len()));
 }
+
+#[test]
+fn test_slice_run_destructors() {
+ use core::cell::Cell;
+
+ // Make sure that destructors get run on slice literals
+ struct Foo<'a> {
+ x: &'a Cell<isize>,
+ }
+
+ impl<'a> Drop for Foo<'a> {
+ fn drop(&mut self) {
+ self.x.set(self.x.get() + 1);
+ }
+ }
+
+ fn foo(x: &Cell<isize>) -> Foo<'_> {
+ Foo { x }
+ }
+
+ let x = &Cell::new(0);
+
+ {
+ let l = &[foo(x)];
+ assert_eq!(l[0].x.get(), 0);
+ }
+
+ assert_eq!(x.get(), 1);
+}