1 files changed, 21 insertions, 0 deletions
diff --git a/src/test/ui/union/issue-99375.rs b/src/test/ui/union/issue-99375.rs
new file mode 100644
index 000000000..175018a7d
--- /dev/null
+++ b/src/test/ui/union/issue-99375.rs
@@ -0,0 +1,21 @@
+// check-pass
+
+union URes<R: Copy> {
+    uninit: (),
+    init: R,
+}
+
+struct Params<F, R: Copy> {
+    function: F,
+    result: URes<R>,
+}
+
+unsafe extern "C" fn do_call<F, R>(params: *mut Params<F, R>)
+where
+    R: Copy,
+    F: Fn() -> R,
+{
+    (*params).result.init = ((*params).function)();
+}
+
+fn main() {}