1 files changed, 57 insertions, 0 deletions
diff --git a/src/test/ui/union/union-pat-refutability.rs b/src/test/ui/union/union-pat-refutability.rs
new file mode 100644
index 000000000..d628a200a
--- /dev/null
+++ b/src/test/ui/union/union-pat-refutability.rs
@@ -0,0 +1,57 @@
+// run-pass
+// revisions: mirunsafeck thirunsafeck
+// [thirunsafeck]compile-flags: -Z thir-unsafeck
+
+#![allow(dead_code)]
+#![allow(illegal_floating_point_literal_pattern)]
+
+#[repr(u32)]
+enum Tag { I, F }
+
+#[repr(C)]
+union U {
+    i: i32,
+    f: f32,
+}
+
+#[repr(C)]
+struct Value {
+    tag: Tag,
+    u: U,
+}
+
+fn is_zero(v: Value) -> bool {
+    unsafe {
+        match v {
+            Value { tag: Tag::I, u: U { i: 0 } } => true,
+            Value { tag: Tag::F, u: U { f: 0.0 } } => true,
+            _ => false,
+        }
+    }
+}
+
+union W {
+    a: u8,
+    b: u8,
+}
+
+fn refut(w: W) {
+    unsafe {
+        match w {
+            W { a: 10 } => {
+                panic!();
+            }
+            W { b } => {
+                assert_eq!(b, 11);
+            }
+        }
+    }
+}
+
+fn main() {
+    let v = Value { tag: Tag::I, u: U { i: 1 } };
+    assert_eq!(is_zero(v), false);
+
+    let w = W { a: 11 };
+    refut(w);
+}