add a run-fail meta test

src/test/run-fail/meta-revision-bad.rs

@@ -0,0 +1,22 @@
+// 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.
+
+// Meta test for compiletest: check that when we give the wrong error
+// patterns, the test fails.
+
+// revisions: foo bar
+// should-fail
+//[foo] error-pattern:bar
+//[bar] error-pattern:foo
+
+#[cfg(foo)] fn die() {panic!("foo");}
+#[cfg(bar)] fn die() {panic!("bar");}
+
+fn main() { die(); }

src/test/run-fail/meta-revision-ok.rs

@@ -0,0 +1,21 @@
+// 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.
+
+// Meta test for compiletest: check that when we give the right error
+// patterns, the test passes. See all `meta-revision-bad.rs`.
+
+// revisions: foo bar
+//[foo] error-pattern:foo
+//[bar] error-pattern:bar
+
+#[cfg(foo)] fn die() {panic!("foo");}
+#[cfg(bar)] fn die() {panic!("bar");}
+
+fn main() { die(); }