1 files changed, 29 insertions, 0 deletions
diff --git a/src/test/ui/structs-enums/tag-align-u64.rs b/src/test/ui/structs-enums/tag-align-u64.rs
new file mode 100644
index 000000000..684b27cd0
--- /dev/null
+++ b/src/test/ui/structs-enums/tag-align-u64.rs
@@ -0,0 +1,29 @@
+// run-pass
+#![allow(dead_code)]
+#![allow(deprecated)]
+
+use std::mem;
+
+enum Tag {
+    TagInner(u64)
+}
+
+struct Rec {
+    c8: u8,
+    t: Tag
+}
+
+fn mk_rec() -> Rec {
+    return Rec { c8:0, t:Tag::TagInner(0) };
+}
+
+fn is_u64_aligned(u: &Tag) -> bool {
+    let p: usize = unsafe { mem::transmute(u) };
+    let u64_align = std::mem::min_align_of::<u64>();
+    return (p & (u64_align - 1)) == 0;
+}
+
+pub fn main() {
+    let x = mk_rec();
+    assert!(is_u64_aligned(&x.t));
+}