1 files changed, 46 insertions, 0 deletions
diff --git a/tests/ui/repr/repr_c_int_align.rs b/tests/ui/repr/repr_c_int_align.rs
new file mode 100644
index 00000000000..fdd14fc2dbe
--- /dev/null
+++ b/tests/ui/repr/repr_c_int_align.rs
@@ -0,0 +1,46 @@
+// run-pass
+// compile-flags: -O
+
+#![allow(dead_code)]
+
+#[repr(C, u8)]
+enum ReprCu8 {
+    A(u16),
+    B,
+}
+
+#[repr(u8)]
+enum Repru8 {
+    A(u16),
+    B,
+}
+
+#[repr(C)]
+struct ReprC {
+    tag: u8,
+    padding: u8,
+    payload: u16,
+}
+
+fn main() {
+    // Test `repr(C, u8)`.
+    let r1 = ReprC { tag: 0, padding: 0, payload: 0 };
+    let r2 = ReprC { tag: 0, padding: 1, payload: 1 };
+
+    let t1: &ReprCu8 = unsafe { std::mem::transmute(&r1) };
+    let t2: &ReprCu8 = unsafe { std::mem::transmute(&r2) };
+
+    match (t1, t2) {
+        (ReprCu8::A(_), ReprCu8::A(_)) => (),
+        _ => assert!(false)
+    };
+
+    // Test `repr(u8)`.
+    let t1: &Repru8 = unsafe { std::mem::transmute(&r1) };
+    let t2: &Repru8 = unsafe { std::mem::transmute(&r2) };
+
+    match (t1, t2) {
+        (Repru8::A(_), Repru8::A(_)) => (),
+        _ => assert!(false)
+    };
+}