Move /src/test to /tests

tests/ui/structs-enums/foreign-struct.rs

@@ -0,0 +1,19 @@
+// run-pass
+#![allow(dead_code)]
+#![allow(non_camel_case_types)]
+
+// Passing enums by value
+
+// pretty-expanded FIXME #23616
+
+pub enum void {}
+
+mod bindgen {
+    use super::void;
+
+    extern "C" {
+        pub fn printf(v: void);
+    }
+}
+
+pub fn main() {}