Add tests and un-xfail a few issues

Closes #4545
Closes #5791
Closes #6470
Closes #8044

src/test/auxiliary/issue-4545.rs

@@ -0,0 +1,12 @@
+// Copyright 2013 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.
+
+pub struct S<T>(Option<T>);
+pub fn mk<T>() -> S<T> { S(None) }

src/test/auxiliary/issue-8044.rs

@@ -0,0 +1,27 @@
+// Copyright 2013 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.
+
+#[feature(struct_variant)];
+
+pub struct BTree<V> {
+    node: TreeItem<V>,
+}
+
+pub enum TreeItem<V> {
+    TreeLeaf { value: V },
+}
+
+pub fn leaf<V>(value: V) -> TreeItem<V> {
+    TreeLeaf { value: value }
+}
+
+fn main() {
+    BTree::<int> { node: leaf(1) };
+}

src/test/run-pass/issue-4545.rs

@@ -0,0 +1,15 @@
+// Copyright 2013 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.
+
+// xfail-fast windows doesn't like aux-build
+// aux-build:issue-4545.rs
+
+extern mod somelib(name = "issue-4545");
+fn main() { somelib::mk::<int>(); }

src/test/run-pass/issue-5791.rs

@@ -0,0 +1,20 @@
+// Copyright 2013 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.
+
+use std::libc;
+
+extern {
+    #[link_name = "malloc"]
+    fn malloc1(len: libc::c_int) -> *libc::c_void;
+    #[link_name = "malloc"]
+    fn malloc2(len: libc::c_int, foo: libc::c_int) -> *libc::c_void;
+}
+
+pub fn main () {}

src/test/run-pass/issue-6470.rs

@@ -8,8 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-// xfail-test
-
 pub mod Bar {
     pub struct Foo {
         v: int,
@@ -21,5 +19,4 @@ pub mod Bar {
     }
 }
 
-fn main() { }
-
+pub fn main() { }

src/test/run-pass/issue-8044.rs

@@ -0,0 +1,19 @@
+// Copyright 2013 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.
+
+// xfail-fast windows doesn't like aux-build
+// aux-build:issue-8044.rs
+
+extern mod minimal(name= "issue-8044");
+use minimal::{BTree, leaf};
+
+fn main() {
+    BTree::<int> { node: leaf(1) };
+}