1 files changed, 18 insertions, 0 deletions
diff --git a/tests/ui/proc-macro/auxiliary/derive-union.rs b/tests/ui/proc-macro/auxiliary/derive-union.rs
new file mode 100644
index 000000000..05883170c
--- /dev/null
+++ b/tests/ui/proc-macro/auxiliary/derive-union.rs
@@ -0,0 +1,18 @@
+// force-host
+// no-prefer-dynamic
+
+#![crate_type = "proc-macro"]
+
+extern crate proc_macro;
+
+use proc_macro::TokenStream;
+
+#[proc_macro_derive(UnionTest)]
+pub fn derive(input: TokenStream) -> TokenStream {
+    let input = input.to_string();
+    assert!(input.contains("#[repr(C)]"));
+    assert!(input.contains("union Test {"));
+    assert!(input.contains("a : u8,"));
+    assert!(input.contains("}"));
+    "".parse().unwrap()
+}