Fixed types, and slimmed down code

I don't this we need to print the definition of the
imported value too, though it's quite possible.

src/test/compile-fail/double-import.rs

@@ -12,14 +12,14 @@
 
 
 mod sub1 {
-    fn foo() {} // Implementation 1
+    fn foo() {} // implementation 1
 }
 
 mod sub2 {
-    fn foo() {} // Implementation 2
+    fn foo() {} // implementation 2
 }
 
-use sub1::foo; //~ NOTE first imported here
-use sub2::foo; //~ ERROR a value named `foo` has already been imported in this module [E0252]
+use sub1::foo; //~ note previous import of `foo` here
+use sub2::foo; //~ error a value named `foo` has already been imported in this module [e0252]
 
 fn main() {}