Tests for cfg attribute.

src/test/compile-fail/test-cfg.rs

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+// Copyright 2012 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: --cfg foo
+
+#[cfg(foo, bar)] // foo AND bar
+fn foo() {}
+
+fn main() {
+    foo(); //~ ERROR unresolved name: `foo`.
+}

src/test/run-pass/cfgs-on-items.rs

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+// Copyright 2012 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: --cfg fooA --cfg fooB
+
+#[cfg(fooA, not(bar))] // fooA AND !bar
+fn foo1() -> int { 1 }
+
+#[cfg(not(fooA, bar))] // !(fooA AND bar)
+fn foo2() -> int { 2 }
+
+#[cfg(fooC)]
+#[cfg(fooB, not(bar))] // fooB AND !bar
+fn foo2() -> int { 3 } // fooC OR (fooB AND !bar)
+
+
+fn main() {
+    fail_unless!(1 == foo1());
+    fail_unless!(3 == foo2());
+}