New upstream version 1.52.0~beta.3+dfsg1

[rustc.git] / library / alloc / src / collections / vec_deque / tests.rs

diff --git a/library/alloc/src/collections/vec_deque/tests.rs b/library/alloc/src/collections/vec_deque/tests.rs
index 87e06fa394d38baef06c904aae9cbd968b5bcabe..6116cfe1d0110bdd33e0087e712a100ce5a066e7 100644 (file)
--- a/library/alloc/src/collections/vec_deque/tests.rs
+++ b/library/alloc/src/collections/vec_deque/tests.rs
@@ -457,6 +457,21 @@ fn test_from_vec() {
             assert!(vd.into_iter().eq(vec));
         }
     }
+
+    let vec = Vec::from([(); MAXIMUM_ZST_CAPACITY - 1]);
+    let vd = VecDeque::from(vec.clone());
+    assert!(vd.cap().is_power_of_two());
+    assert_eq!(vd.len(), vec.len());
+}
+
+#[test]
+#[should_panic = "capacity overflow"]
+fn test_from_vec_zst_overflow() {
+    use crate::vec::Vec;
+    let vec = Vec::from([(); MAXIMUM_ZST_CAPACITY]);
+    let vd = VecDeque::from(vec.clone()); // no room for +1
+    assert!(vd.cap().is_power_of_two());
+    assert_eq!(vd.len(), vec.len());
 }
 
 #[test]