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diff --git a/src/test/ui/closures/2229_closure_analysis/diagnostics/union.rs b/src/test/ui/closures/2229_closure_analysis/diagnostics/union.rs
new file mode 100644
index 000000000..46b54846e
--- /dev/null
+++ b/src/test/ui/closures/2229_closure_analysis/diagnostics/union.rs
@@ -0,0 +1,25 @@
+// edition:2021
+
+// Test that we point to the correct location that results a union being captured.
+// Union is special because it can't be disjointly captured.
+
+union A {
+    y: u32,
+    x: (),
+}
+
+fn main() {
+    let mut a = A { y: 1 };
+    let mut c = || {
+    //~^ borrow of `a.y` occurs here
+        let _ = unsafe { &a.y };
+        let _ = &mut a;
+        //~^ borrow occurs due to use in closure
+        let _ = unsafe { &mut a.y };
+    };
+    a.y = 1;
+    //~^ cannot assign to `a.y` because it is borrowed [E0506]
+    //~| assignment to borrowed `a.y` occurs here
+    c();
+    //~^ borrow later used here
+}