Test staging attributes when -Zforce-unstable-if-unmarked is set

Both new tests currently fail

Author: RalfJung

src/test/compile-fail/stability-attribute-non-staged-force-unstable.rs

@@ -0,0 +1,16 @@
+// 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.
+
+// compile-flags:-Zforce-unstable-if-unmarked
+
+#[unstable] //~ ERROR: stability attributes may not be used
+#[stable] //~ ERROR: stability attributes may not be used
+#[rustc_deprecated] //~ ERROR: stability attributes may not be used
+fn main() { }

src/test/run-pass/deprecation-in-force-unstable.rs

@@ -0,0 +1,14 @@
+// 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.
+
+// compile-flags:-Zforce-unstable-if-unmarked
+
+#[deprecated] // should work even with -Zforce-unstable-if-unmarked
+fn main() { }