Add test for vecs with overaligned data

[rust.git] / src / libcollections / tests / vec.rs

diff --git a/src/libcollections/tests/vec.rs b/src/libcollections/tests/vec.rs
index 29f18274962fe04e6c3a517370c401d610f711ca..fdf453b39cf5d9144c21cf9c4091af7c41c44312 100644 (file)
--- a/src/libcollections/tests/vec.rs
+++ b/src/libcollections/tests/vec.rs
@@ -781,3 +781,18 @@ fn from_into_inner() {
     assert_eq!(vec, [2, 3]);
     assert!(ptr != vec.as_ptr());
 }
+
+#[test]
+fn overaligned_allocations() {
+    #[repr(align(256))]
+    struct Foo(usize);
+    let mut v = vec![Foo(273)];
+    for i in 0..0x1000 {
+        v.reserve_exact(i);
+        assert!(v[0].0 == 273);
+        assert!(v.as_ptr() as usize & 0xff == 0);
+        v.shrink_to_fit();
+        assert!(v[0].0 == 273);
+        assert!(v.as_ptr() as usize & 0xff == 0);
+    }
+}