fix accidental reversal of 'static, and add a test

Author: nikomatsakis

src/librustc/middle/free_region.rs

@@ -93,7 +93,7 @@ impl FreeRegionMap {
         let result = sub == sup || {
             let sub = ty::ReFree(sub);
             let sup = ty::ReFree(sup);
-            self.relation.contains(&sub, &sup) || self.relation.contains(&sup, &ty::ReStatic)
+            self.relation.contains(&sub, &sup) || self.relation.contains(&ty::ReStatic, &sup)
         };
         debug!("sub_free_region(sub={:?}, sup={:?}) = {:?}", sub, sup, result);
         result

src/test/run-pass/regions-free-region-outlives-static-outlives-free-region.rs

@@ -0,0 +1,25 @@
+// 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.
+
+// Test that we recognize that if you have
+//
+//     'a : 'static
+//
+// then
+//
+//     'a : 'b
+
+fn test<'a,'b>(x: &'a i32) -> &'b i32
+    where 'a: 'static
+{
+    x
+}
+
+fn main() { }