Fallout: tests. As tests frequently elide things, lots of changes

here.  Some of this may have been poorly rebased, though I tried to be
careful and preserve the spirit of the test.

Author: nikomatsakis

src/libcoretest/mem.rs

@@ -92,7 +92,7 @@ fn test_transmute_copy() {
 
 #[test]
 fn test_transmute() {
-    trait Foo {}
+    trait Foo { fn dummy(&self) { } }
     impl Foo for int {}
 
     let a = box 100 as Box<Foo>;

src/test/auxiliary/coherence-orphan-lib.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-pub trait TheTrait<T> {
+pub trait TheTrait<T> : ::std::marker::PhantomFn<T> {
     fn the_fn(&self);
 }