Treat unary struct and enum variants as rvalues

Closes #11681

src/test/compile-fail/regions-lifetime-of-struct-or-enum-variant.rs

@@ -0,0 +1,32 @@
+// Copyright 2014 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.
+
+// This tests verifies that unary structs and enum variants
+// are treated as rvalues and their lifetime is not bounded to
+// the static scope.
+
+struct Test;
+
+enum MyEnum {
+    Variant1
+}
+
+fn structLifetime() -> &Test {
+  let testValue = &Test; //~ ERROR borrowed value does not live long enough
+  testValue
+}
+
+fn variantLifetime() -> &MyEnum {
+  let testValue = &Variant1; //~ ERROR borrowed value does not live long enough
+  testValue
+}
+
+
+fn main() {}