Test and gate empty structures and variants better

src/test/run-pass/empty-struct-braces.rs

@@ -0,0 +1,88 @@
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// Empty struct defined with braces add names into type namespace
+// Empty struct defined without braces add names into both type and value namespaces
+
+#![feature(braced_empty_structs)]
+
+struct Empty1 {}
+struct Empty2;
+struct Empty3 {}
+const Empty3: Empty3 = Empty3 {};
+
+enum E {
+    Empty4 {},
+    Empty5,
+}
+
+fn main() {
+    let e1: Empty1 = Empty1 {};
+    let e2: Empty2 = Empty2 {};
+    let e2: Empty2 = Empty2;
+    let e3: Empty3 = Empty3 {};
+    let e3: Empty3 = Empty3;
+    let e4: E = E::Empty4 {};
+    // let e5: E = E::Empty5 {}; // Issue #28692
+    let e5: E = E::Empty5;
+
+    match e1 {
+        Empty1 {} => {}
+    }
+    match e2 {
+        Empty2 {} => {}
+    }
+    match e3 {
+        Empty3 {} => {}
+    }
+    match e4 {
+        E::Empty4 {} => {}
+        _ => {}
+    }
+    // Issue #28692
+    // match e5 {
+    //     E::Empty5 {} => {}
+    //     _ => {}
+    // }
+
+    match e1 {
+        Empty1 { .. } => {}
+    }
+    match e2 {
+        Empty2 { .. } => {}
+    }
+    match e3 {
+        Empty3 { .. } => {}
+    }
+    match e4 {
+        E::Empty4 { .. } => {}
+        _ => {}
+    }
+    // Issue #28692
+    // match e5 {
+    //     E::Empty5 { .. } => {}
+    //     _ => {}
+    // }
+
+    match e2 {
+        Empty2 => {}
+    }
+    match e3 {
+        Empty3 => {}
+    }
+    match e5 {
+        E::Empty5 => {}
+        _ => {}
+    }
+
+    let e11: Empty1 = Empty1 { ..e1 };
+    let e22: Empty2 = Empty2 { ..e2 };
+    let e33: Empty3 = Empty3 { ..e3 };
+}