1 files changed, 15 insertions, 0 deletions
diff --git a/src/test/ui/unsafe/access_union_field.rs b/src/test/ui/unsafe/access_union_field.rs
new file mode 100644
index 000000000..5c4e695df
--- /dev/null
+++ b/src/test/ui/unsafe/access_union_field.rs
@@ -0,0 +1,15 @@
+// revisions: mir thir
+// [thir]compile-flags: -Z thir-unsafeck
+
+#![allow(unused_variables)]
+
+union Foo {
+    bar: i8,
+    baz: u8,
+}
+
+fn main() {
+    let foo = Foo { bar: 5 };
+    let a = foo.bar; //~ ERROR access to union field is unsafe and requires unsafe function or block
+    let b = foo.baz; //~ ERROR access to union field is unsafe and requires unsafe function or block
+}