Test using attribute not on an expected item

Author: daxpedda

non-msrv-tests/tests/ui/non_item.rs

@@ -0,0 +1,6 @@
+use derive_where::derive_where;
+
+#[derive_where(Clone)]
+const _: () = ();
+
+fn main() {}

non-msrv-tests/tests/ui/non_item.stderr

@@ -0,0 +1,5 @@
+error: expected one of: `struct`, `enum`, `union`
+ --> tests/ui/non_item.rs:4:1
+  |
+4 | const _: () = ();
+  | ^^^^^