tests: add test for empty <>

src/test/run-pass/empty-type-parameter-list.rs

@@ -0,0 +1,33 @@
+// Copyright 2016 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.
+
+// Test that empty type parameter list (<>) is synonymous with
+// no type parameters at all
+
+struct S<>;
+trait T<> {}
+enum E<> { V }
+impl<> T<> for S<> {}
+impl T for E {}
+fn foo<>() {}
+fn bar() {}
+
+fn main() {
+    let _ = S;
+    let _ = S::<>;
+    let _ = E::V;
+    let _ = E::<>::V;
+    foo();
+    foo::<>();
+
+    // Test that we can supply <> to non generic things
+    bar::<>();
+    let _: i32<>;
+}