Propagate reachability through reexported impls

When re-exporting a trait/structure/enum, then we need to propagate the
reachability of the type through the methods that are defined on it.

Closes #9906
Closes #9968

src/test/auxiliary/issue-9906.rs

@@ -0,0 +1,28 @@
+// 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 extern mod
+// aux-build:issue-9906.rs
+
+pub use other::FooBar;
+pub use other::foo;
+
+mod other {
+    pub struct FooBar{value: int}
+    impl FooBar{
+        pub fn new(val: int) -> FooBar {
+            FooBar{value: val}
+        }
+    }
+
+    pub fn foo(){
+        1+1;
+    }
+}

src/test/auxiliary/issue-9968.rs

@@ -0,0 +1,32 @@
+// 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 use internal::core::{Trait, Struct};
+
+mod internal {
+    pub mod core {
+        pub struct Struct;
+        impl Struct {
+            pub fn init() -> Struct {
+                Struct
+            }
+        }
+
+        pub trait Trait {
+            fn test(&self) {
+                private();
+            }
+        }
+
+        impl Trait for Struct {}
+
+        fn private() { }
+    }
+}

src/test/run-pass/issue-9906.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 extern mod
+// aux-build:issue-9906.rs
+
+extern mod testmod(name = "issue-9906");
+
+fn main() {
+    testmod::foo();
+    testmod::FooBar::new(1);
+}

src/test/run-pass/issue-9968.rs

@@ -0,0 +1,21 @@
+// 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 extern mod
+// aux-build:issue-9968.rs
+
+extern mod lib(name = "issue-9968");
+
+use lib::{Trait, Struct};
+
+fn main()
+{
+    Struct::init().test();
+}