Fix test (uncaught error message)

Author: emberian

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

@@ -11,6 +11,7 @@
 use foo::bar; //~ ERROR unresolved import. maybe a missing `extern mod foo`?
               //~^ ERROR failed to resolve import
 use x = bar::baz; //~ ERROR unresolved import: could not find `baz` in `bar`
+                  //~^ ERROR failed to resolve import
 
 mod bar {
     struct bar;