2 files changed, 17 insertions, 0 deletions
diff --git a/tests/ui/typeck/invalid-stashed-level-issue-121812.rs b/tests/ui/typeck/invalid-stashed-level-issue-121812.rs
new file mode 100644
index 00000000000..4b61f4f2c63
--- /dev/null
+++ b/tests/ui/typeck/invalid-stashed-level-issue-121812.rs
@@ -0,0 +1,8 @@
+union U {
+    a: u16,
+    b: [u8; 3],
+}
+
+fn main() {
+    _ = U { b: [()] }; //~ ERROR mismatched types
+}
diff --git a/tests/ui/typeck/invalid-stashed-level-issue-121812.stderr b/tests/ui/typeck/invalid-stashed-level-issue-121812.stderr
new file mode 100644
index 00000000000..9465935c8c2
--- /dev/null
+++ b/tests/ui/typeck/invalid-stashed-level-issue-121812.stderr
@@ -0,0 +1,9 @@
+error[E0308]: mismatched types
+  --> $DIR/invalid-stashed-level-issue-121812.rs:7:17
+   |
+LL |     _ = U { b: [()] };
+   |                 ^^ expected `u8`, found `()`
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0308`.